LEET-AND-FUN

A collection of LeetCode questions to ace the coding interview! - Created using LeetHub v2

LeetCode Topics

Math

0002-add-two-numbers
0007-reverse-integer
0009-palindrome-number
0012-integer-to-roman
0013-roman-to-integer
0029-divide-two-integers
0043-multiply-strings
0048-rotate-image
0050-powx-n
0062-unique-paths
0066-plus-one
0069-sqrtx
0070-climbing-stairs
0149-max-points-on-a-line
0150-evaluate-reverse-polish-notation
0166-fraction-to-recurring-decimal
0168-excel-sheet-column-title
0171-excel-sheet-column-number
0172-factorial-trailing-zeroes
0189-rotate-array
0204-count-primes
0223-rectangle-area
0224-basic-calculator
0227-basic-calculator-ii
0231-power-of-two
0258-add-digits
0263-ugly-number
0268-missing-number
0273-integer-to-english-words
0282-expression-add-operators
0292-nim-game
0326-power-of-three
0342-power-of-four
0367-valid-perfect-square
0368-largest-divisible-subset
0382-linked-list-random-node
0384-shuffle-an-array
0391-perfect-rectangle
0398-random-pick-index
0412-fizz-buzz
0415-add-strings
0441-arranging-coins
0445-add-two-numbers-ii
0462-minimum-moves-to-equal-array-elements-ii
0477-total-hamming-distance
0492-construct-the-rectangle
0504-base-7
0507-perfect-number
0539-minimum-time-difference
0593-valid-square
0633-sum-of-square-numbers
0650-2-keys-keyboard
0670-maximum-swap
0797-rabbits-in-forest
0805-escape-the-ghosts
0909-stone-game
0915-generate-random-point-in-a-circle
0919-projection-area-of-3d-shapes
1006-clumsy-factorial
1010-powerful-integers
1013-fibonacci-number
1033-broken-calculator
1119-robot-bounded-in-circle
1146-greatest-common-divisor-of-strings
1236-n-th-tribonacci-number
1252-cells-with-odd-values-in-a-matrix
1260-day-of-the-year
1284-four-divisors
1349-check-if-it-is-a-straight-line
1421-find-numbers-with-even-number-of-digits
1426-find-n-unique-integers-sum-up-to-zero
1430-find-the-k-beauty-of-a-number
1440-convert-integer-to-the-sum-of-two-no-zero-integers
1446-angle-between-hands-of-a-clock
1477-product-of-the-last-k-numbers
1523-count-odd-numbers-in-an-interval-range
1642-water-bottles
1817-calculate-money-in-leetcode-bank
1885-count-number-of-homogenous-substrings
1889-check-if-number-is-a-sum-of-powers-of-three
1920-determine-color-of-a-chessboard-square
1925-count-nice-pairs-in-an-array
1951-find-the-winner-of-the-circular-game
1993-sum-of-all-subset-xor-totals
2083-three-divisors
2106-find-greatest-common-divisor-of-array
2110-number-of-smooth-descent-periods-of-a-stock
2129-number-of-pairs-of-interchangeable-rectangles
2160-minimum-operations-to-make-a-uni-value-grid
2206-detonate-the-maximum-bombs
2238-a-number-after-a-double-reversal
2244-number-of-laser-beams-in-a-bank
2278-find-three-consecutive-integers-that-sum-to-a-given-number
2284-smallest-value-of-the-rearranged-number
2307-replace-non-coprime-numbers-in-array
2367-minimum-lines-to-represent-a-line-chart
2383-add-two-integers
2432-number-of-zero-filled-subarrays
2448-count-number-of-bad-pairs
2481-strictly-palindromic-number
2491-smallest-even-multiple
2525-count-number-of-distinct-integers-after-reverse-operations
2544-minimum-addition-to-make-integer-beautiful
2575-minimum-cuts-to-divide-a-circle
2610-closest-prime-numbers-in-range
2645-pass-the-pillow
2680-count-collisions-of-monkeys-on-a-polygon
2752-sum-multiples
2802-find-the-punishment-number-of-an-integer
2824-check-if-the-number-is-fascinating
2857-total-distance-traveled
2903-insert-greatest-common-divisors-in-linked-list
2998-count-symmetric-integers
3172-divisible-and-non-divisible-sums-difference
3199-distribute-candies-among-children-i
3227-find-missing-and-repeated-values
3321-type-of-triangle
3336-water-bottles-ii
3371-harshad-number
3416-sum-of-digit-differences-of-all-pairs
3433-count-mentions-per-user
3462-vowels-game-in-a-string
3555-final-array-state-after-k-multiplication-operations-i
3629-total-characters-in-string-after-transformations-i
3676-smallest-number-with-all-set-bits
3744-minimum-operations-to-make-array-elements-zero
3830-find-closest-person

Greedy

0011-container-with-most-water
0045-jump-game-ii
0055-jump-game
0122-best-time-to-buy-and-sell-stock-ii
0135-candy
0179-largest-number
0316-remove-duplicate-letters
0334-increasing-triplet-subsequence
0402-remove-k-digits
0435-non-overlapping-intervals
0452-minimum-number-of-arrows-to-burst-balloons
0455-assign-cookies
0605-can-place-flowers
0611-valid-triangle-number
0621-task-scheduler
0624-maximum-distance-in-arrays
0649-dota2-senate
0670-maximum-swap
0678-valid-parenthesis-string
0680-valid-palindrome-ii
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0768-partition-labels
0778-reorganize-string
0780-max-chunks-to-make-sorted
0797-rabbits-in-forest
0825-max-increase-to-keep-city-skyline
0876-hand-of-straights
0890-lemonade-change
0917-boats-to-save-people
0957-minimum-add-to-make-parentheses-valid
0979-di-string-match
1033-broken-calculator
1049-minimum-domino-rotations-for-equal-row
1169-largest-values-from-labels
1252-break-a-palindrome
1304-longest-happy-string
1346-maximize-the-topmost-element-after-k-moves
1422-divide-array-in-sets-of-k-consecutive-numbers
1499-maximum-performance-of-a-team
1502-construct-k-palindrome-strings
1575-maximum-area-of-a-piece-of-cake-after-horizontal-and-vertical-cuts
1647-minimum-deletions-to-make-character-frequencies-unique
1762-furthest-building-you-can-reach
1766-minimum-number-of-removals-to-make-mountain-array
1818-maximum-score-from-removing-substrings
1834-minimum-number-of-people-to-teach
1880-largest-merge-of-two-strings
1917-maximum-average-pass-ratio
1988-minimize-maximum-pair-sum-in-array
2026-merge-triplets-to-form-target-triplet
2089-maximum-matrix-sum
2091-removing-minimum-and-maximum-from-array
2094-remove-stones-to-minimize-the-total
2095-minimum-number-of-swaps-to-make-the-string-balanced
2154-minimum-moves-to-convert-string
2221-check-if-a-parentheses-string-can-be-valid
2245-destroying-asteroids
2300-construct-string-with-repeat-limit
2345-minimum-number-of-operations-to-convert-time
2456-construct-smallest-number-from-di-string
2487-optimal-partition-of-string
2488-divide-intervals-into-minimum-number-of-groups
2509-minimize-xor
2544-minimum-addition-to-make-integer-beautiful
2590-maximum-star-sum-of-a-graph
2616-maximal-score-after-applying-k-operations
2636-maximum-subsequence-score
2640-maximum-number-of-integers-to-choose-from-a-range-i
2681-put-marbles-in-bags
2816-lexicographically-smallest-palindrome
3195-separate-black-and-white-balls
3262-find-polygon-with-the-largest-perimeter
3493-maximum-number-of-operations-to-move-ones-to-the-end
3788-maximum-unique-subarray-sum-after-deletion
3894-maximize-ysum-by-picking-a-triplet-of-distinct-xvalues

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0023-merge-k-sorted-lists
0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group
0061-rotate-list
0082-remove-duplicates-from-sorted-list-ii
0083-remove-duplicates-from-sorted-list
0086-partition-list
0092-reverse-linked-list-ii
0109-convert-sorted-list-to-binary-search-tree
0114-flatten-binary-tree-to-linked-list
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0142-linked-list-cycle-ii
0143-reorder-list
0147-insertion-sort-list
0148-sort-list
0160-intersection-of-two-linked-lists
0206-reverse-linked-list
0234-palindrome-linked-list
0237-delete-node-in-a-linked-list
0328-odd-even-linked-list
0382-linked-list-random-node
0445-add-two-numbers-ii
0528-swapping-nodes-in-a-linked-list
0766-flatten-a-multilevel-doubly-linked-list
0817-design-hashmap
0835-linked-list-components
0860-design-circular-queue
0908-middle-of-the-linked-list
1072-next-greater-node-in-linked-list
1582-design-browser-history
1767-design-front-middle-back-queue
2216-delete-the-middle-node-of-a-linked-list
2236-maximum-twin-sum-of-a-linked-list
2903-insert-greatest-common-divisors-in-linked-list

Stack

0020-valid-parentheses
0042-trapping-rain-water
0071-simplify-path
0094-binary-tree-inorder-traversal
0114-flatten-binary-tree-to-linked-list
0143-reorder-list
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0150-evaluate-reverse-polish-notation
0155-min-stack
0173-binary-search-tree-iterator
0224-basic-calculator
0225-implement-stack-using-queues
0227-basic-calculator-ii
0232-implement-queue-using-stacks
0234-palindrome-linked-list
0316-remove-duplicate-letters
0331-verify-preorder-serialization-of-a-binary-tree
0394-decode-string
0402-remove-k-digits
0445-add-two-numbers-ii
0496-next-greater-element-i
0636-exclusive-time-of-functions
0678-valid-parenthesis-string
0682-baseball-game
0726-number-of-atoms
0735-asteroid-collision
0739-daily-temperatures
0775-n-ary-tree-preorder-traversal
0776-n-ary-tree-postorder-traversal
0780-max-chunks-to-make-sorted
0957-minimum-add-to-make-parentheses-valid
0983-validate-stack-sequences
1002-maximum-width-ramp
1006-clumsy-factorial
1045-check-if-word-is-valid-after-substitutions
1072-next-greater-node-in-linked-list
1128-remove-all-adjacent-duplicates-in-string
1197-parsing-a-boolean-expression
1320-remove-all-adjacent-duplicates-in-string-ii
1371-minimum-remove-to-make-valid-parentheses
1441-build-an-array-with-stack-operations
1582-design-browser-history
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1720-crawler-log-folder
1818-maximum-score-from-removing-substrings
2021-remove-all-occurrences-of-a-substring
2095-minimum-number-of-swaps-to-make-the-string-balanced
2221-check-if-a-parentheses-string-can-be-valid
2236-maximum-twin-sum-of-a-linked-list
2307-replace-non-coprime-numbers-in-array
2317-count-collisions-on-a-road
2456-construct-smallest-number-from-di-string
2470-removing-stars-from-a-string
3181-find-building-where-alice-and-bob-can-meet
3447-clear-digits

Recursion

0002-add-two-numbers
0010-regular-expression-matching
0021-merge-two-sorted-lists
0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group
0050-powx-n
0143-reorder-list
0206-reverse-linked-list
0224-basic-calculator
0231-power-of-two
0234-palindrome-linked-list
0273-integer-to-english-words
0326-power-of-three
0342-power-of-four
0394-decode-string
1013-fibonacci-number
1197-parsing-a-boolean-expression
1667-find-kth-bit-in-nth-binary-string
1951-find-the-winner-of-the-circular-game
2680-count-collisions-of-monkeys-on-a-polygon

Array

0001-two-sum
0004-median-of-two-sorted-arrays
0011-container-with-most-water
0014-longest-common-prefix
0015-3sum
0018-4sum
0026-remove-duplicates-from-sorted-array
0027-remove-element
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0036-valid-sudoku
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0041-first-missing-positive
0042-trapping-rain-water
0045-jump-game-ii
0046-permutations
0047-permutations-ii
0048-rotate-image
0049-group-anagrams
0051-n-queens
0053-maximum-subarray
0054-spiral-matrix
0055-jump-game
0056-merge-intervals
0057-insert-interval
0059-spiral-matrix-ii
0063-unique-paths-ii
0064-minimum-path-sum
0066-plus-one
0068-text-justification
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0075-sort-colors
0078-subsets
0079-word-search
0080-remove-duplicates-from-sorted-array-ii
0081-search-in-rotated-sorted-array-ii
0090-subsets-ii
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0118-pascals-triangle
0119-pascals-triangle-ii
0120-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0128-longest-consecutive-sequence
0130-surrounded-regions
0135-candy
0136-single-number
0149-max-points-on-a-line
0150-evaluate-reverse-polish-notation
0152-maximum-product-subarray
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0164-maximum-gap
0167-two-sum-ii-input-array-is-sorted
0169-majority-element
0179-largest-number
0188-best-time-to-buy-and-sell-stock-iv
0189-rotate-array
0198-house-robber
0200-number-of-islands
0204-count-primes
0209-minimum-size-subarray-sum
0212-word-search-ii
0213-house-robber-ii
0215-kth-largest-element-in-an-array
0216-combination-sum-iii
0217-contains-duplicate
0219-contains-duplicate-ii
0221-maximal-square
0238-product-of-array-except-self
0239-sliding-window-maximum
0260-single-number-iii
0268-missing-number
0275-h-index-ii
0283-move-zeroes
0284-peeking-iterator
0287-find-the-duplicate-number
0289-game-of-life
0300-longest-increasing-subsequence
0304-range-sum-query-2d-immutable
0307-range-sum-query-mutable
0309-best-time-to-buy-and-sell-stock-with-cooldown
0322-coin-change
0334-increasing-triplet-subsequence
0336-palindrome-pairs
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0368-largest-divisible-subset
0384-shuffle-an-array
0391-perfect-rectangle
0399-evaluate-division
0403-frog-jump
0407-trapping-rain-water-ii
0414-third-maximum-number
0416-partition-equal-subset-sum
0417-pacific-atlantic-water-flow
0419-battleships-in-a-board
0435-non-overlapping-intervals
0442-find-all-duplicates-in-an-array
0448-find-all-numbers-disappeared-in-an-array
0452-minimum-number-of-arrows-to-burst-balloons
0455-assign-cookies
0462-minimum-moves-to-equal-array-elements-ii
0463-island-perimeter
0474-ones-and-zeroes
0477-total-hamming-distance
0485-max-consecutive-ones
0494-target-sum
0496-next-greater-element-i
0498-diagonal-traverse
0500-keyboard-row
0518-coin-change-ii
0524-longest-word-in-dictionary-through-deleting
0529-minesweeper
0539-minimum-time-difference
0540-single-element-in-a-sorted-array
0542-01-matrix
0554-brick-wall
0560-subarray-sum-equals-k
0605-can-place-flowers
0609-find-duplicate-file-in-system
0611-valid-triangle-number
0621-task-scheduler
0624-maximum-distance-in-arrays
0636-exclusive-time-of-functions
0643-maximum-average-subarray-i
0645-set-mismatch
0682-baseball-game
0689-maximum-sum-of-3-non-overlapping-subarrays
0695-max-area-of-island
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0720-longest-word-in-dictionary
0724-find-pivot-index
0729-my-calendar-i
0733-flood-fill
0735-asteroid-collision
0739-daily-temperatures
0745-find-smallest-letter-greater-than-target
0747-min-cost-climbing-stairs
0764-largest-plus-sign
0780-max-chunks-to-make-sorted
0787-sliding-puzzle
0792-binary-search
0794-swim-in-rising-water
0797-rabbits-in-forest
0805-escape-the-ghosts
0810-valid-tic-tac-toe-state
0817-design-hashmap
0825-max-increase-to-keep-city-skyline
0835-linked-list-components
0839-short-encoding-of-words
0860-design-circular-queue
0861-flipping-an-image
0869-similar-string-groups
0876-hand-of-straights
0878-shifting-letters
0879-maximize-distance-to-closest-person
0882-peak-index-in-a-mountain-array
0890-lemonade-change
0892-shortest-subarray-with-sum-at-least-k
0898-transpose-matrix
0905-length-of-longest-fibonacci-subsequence
0906-walking-robot-simulation
0907-koko-eating-bananas
0909-stone-game
0917-boats-to-save-people
0919-projection-area-of-3d-shapes
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0932-monotonic-array
0948-sort-an-array
0951-partition-array-into-disjoint-intervals
0960-minimize-malware-spread
0967-minimum-falling-path-sum
0971-shortest-bridge
0978-valid-mountain-array
0979-di-string-match
0983-validate-stack-sequences
0999-regions-cut-by-slashes
1002-maximum-width-ramp
1018-binary-prefix-divisible-by-5
1022-unique-paths-iii
1025-minimum-cost-for-tickets
1032-satisfiability-of-equality-equations
1036-rotting-oranges
1037-minimum-number-of-k-consecutive-bit-flips
1039-find-the-town-judge
1041-available-captures-for-rook
1046-max-consecutive-ones-iii
1049-minimum-domino-rotations-for-equal-row
1072-next-greater-node-in-linked-list
1073-number-of-enclaves
1097-stream-of-characters
1104-coloring-a-border
1106-escape-a-large-maze
1111-minimum-score-triangulation-of-polygon
1127-last-stone-weight
1137-height-checker
1147-flip-columns-for-maximum-number-of-equal-rows
1169-largest-values-from-labels
1171-shortest-path-in-binary-matrix
1184-car-pooling
1206-corporate-flight-bookings
1222-remove-covered-intervals
1227-number-of-equivalent-domino-pairs
1232-sum-of-mutated-array-closest-to-target
1252-cells-with-odd-values-in-a-matrix
1256-rank-transform-of-an-array
1272-invalid-transactions
1284-four-divisors
1288-maximum-subarray-sum-with-one-deletion
1293-three-consecutive-odds
1312-count-artifacts-that-can-be-extracted
1319-unique-number-of-occurrences
1325-path-with-maximum-probability
1329-sort-the-matrix-diagonally
1331-path-with-maximum-gold
1335-maximum-candies-allocated-to-k-children
1342-queens-that-can-attack-the-king
1346-maximize-the-topmost-element-after-k-moves
1349-check-if-it-is-a-straight-line
1350-remove-sub-folders-from-the-filesystem
1353-find-resultant-array-after-removing-anagrams
1354-find-players-with-zero-or-one-losses
1364-tuple-with-same-product
1365-how-many-numbers-are-smaller-than-the-current-number
1396-count-servers-that-communicate
1397-search-suggestions-system
1400-find-winner-on-a-tic-tac-toe-game
1402-count-square-submatrices-with-all-ones
1414-shortest-path-in-a-grid-with-obstacles-elimination
1421-find-numbers-with-even-number-of-digits
1422-divide-array-in-sets-of-k-consecutive-numbers
1424-maximum-candies-you-can-get-from-boxes
1426-find-n-unique-integers-sum-up-to-zero
1428-jump-game-iii
1441-build-an-array-with-stack-operations
1445-number-of-sub-arrays-of-size-k-and-average-greater-than-or-equal-to-threshold
1447-jump-game-iv
1449-print-words-vertically
1468-check-if-n-and-its-double-exist
1476-count-negative-numbers-in-a-sorted-matrix
1477-product-of-the-last-k-numbers
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1499-maximum-performance-of-a-team
1524-string-matching-in-an-array
1528-kids-with-the-greatest-number-of-candies
1539-diagonal-traverse-ii
1547-destination-city
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1575-maximum-area-of-a-piece-of-cake-after-horizontal-and-vertical-cuts
1580-shuffle-the-array
1582-design-browser-history
1586-longest-subarray-of-1s-after-deleting-one-element
1620-check-if-array-pairs-are-divisible-by-k
1627-last-moment-before-all-ants-fall-out-of-a-plank
1646-kth-missing-positive-number
1656-count-good-triplets
1663-detect-cycles-in-2d-grid
1677-matrix-diagonal-sum
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1694-make-sum-divisible-by-p
1704-special-positions-in-a-binary-matrix
1706-min-cost-to-connect-all-points
1706-where-will-the-ball-fall
1720-crawler-log-folder
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1755-defuse-the-bomb
1762-furthest-building-you-can-reach
1766-minimum-number-of-removals-to-make-mountain-array
1767-design-front-middle-back-queue
1776-minimum-operations-to-reduce-x-to-zero
1798-max-number-of-k-sum-pairs
1803-average-waiting-time
1813-maximum-erasure-value
1819-construct-the-lexicographically-largest-valid-sequence
1833-find-the-highest-altitude
1834-minimum-number-of-people-to-teach
1849-maximum-absolute-sum-of-any-subarray
1866-restore-the-array-from-adjacent-pairs
1876-map-of-highest-peak
1878-check-if-array-is-sorted-and-rotated
1886-minimum-limit-of-balls-in-a-bag
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1905-count-sub-islands
1917-maximum-average-pass-ratio
1925-count-nice-pairs-in-an-array
1927-maximum-ascending-subarray-sum
1934-evaluate-the-bracket-pairs-of-a-string
1940-maximum-xor-for-each-query
1951-find-the-winner-of-the-circular-game
1972-rotating-the-box
1988-minimize-maximum-pair-sum-in-array
1993-sum-of-all-subset-xor-totals
2006-find-the-student-that-will-replace-the-chalk
2023-design-movie-rental-system
2026-merge-triplets-to-form-target-triplet
2038-nearest-exit-from-entrance-in-maze
2048-build-array-from-permutation
2054-the-number-of-the-smallest-unoccupied-chair
2058-concatenation-of-array
2080-check-if-move-is-legal
2089-maximum-matrix-sum
2091-removing-minimum-and-maximum-from-array
2094-remove-stones-to-minimize-the-total
2103-find-all-groups-of-farmland
2106-find-greatest-common-divisor-of-array
2107-find-unique-binary-string
2110-number-of-smooth-descent-periods-of-a-stock
2116-count-number-of-pairs-with-absolute-difference-k
2129-number-of-pairs-of-interchangeable-rectangles
2132-convert-1d-array-into-2d-array
2133-number-of-pairs-of-strings-with-concatenation-equal-to-target
2145-grid-game
2160-minimum-operations-to-make-a-uni-value-grid
2164-two-best-non-overlapping-events
2169-simple-bank-system
2170-count-number-of-maximum-bitwise-or-subsets
2175-count-nodes-with-the-highest-score
2179-most-beautiful-item-for-each-query
2188-minimized-maximum-of-products-distributed-to-any-store
2206-detonate-the-maximum-bombs
2220-find-all-possible-recipes-from-given-supplies
2231-find-first-palindromic-string-in-the-array
2232-adding-spaces-to-a-string
2244-number-of-laser-beams-in-a-bank
2245-destroying-asteroids
2249-count-the-hidden-sequences
2262-solving-questions-with-brainpower
2271-rearrange-array-elements-by-sign
2274-keep-multiplying-found-values-by-two
2277-count-equal-and-divisible-pairs-in-an-array
2280-count-good-triplets-in-an-array
2306-create-binary-tree-from-descriptions
2307-replace-non-coprime-numbers-in-array
2308-divide-array-into-equal-pairs
2316-count-hills-and-valleys-in-an-array
2334-number-of-flowers-in-full-bloom
2339-k-divisible-elements-subarrays
2343-count-unguarded-cells-in-the-grid
2356-largest-combination-with-bitwise-and-greater-than-zero
2358-number-of-ways-to-split-array
2367-minimum-lines-to-represent-a-line-chart
2375-minimum-obstacle-removal-to-reach-corner
2386-min-max-game
2390-naming-a-company
2428-equal-row-and-column-pairs
2429-design-a-food-rating-system
2432-number-of-zero-filled-subarrays
2445-reachable-nodes-with-restrictions
2447-merge-similar-items
2448-count-number-of-bad-pairs
2454-largest-local-values-in-a-matrix
2465-shifting-letters-ii
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2478-longest-nice-subarray
2483-task-scheduler-ii
2488-divide-intervals-into-minimum-number-of-groups
2494-sum-of-prefix-scores-of-strings
2525-count-number-of-distinct-integers-after-reverse-operations
2533-bitwise-xor-of-all-pairings
2536-determine-if-two-events-have-conflict
2543-most-popular-video-creator
2545-height-of-binary-tree-after-subtree-removal-queries
2550-words-within-two-edits-of-dictionary
2551-apply-operations-to-an-array
2552-maximum-sum-of-distinct-subarrays-with-length-k
2553-total-cost-to-hire-k-workers
2554-minimum-total-distance-traveled
2561-number-of-distinct-averages
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2588-maximum-number-of-points-from-grid-queries
2590-maximum-star-sum-of-a-graph
2598-shortest-distance-to-target-string-in-a-circular-array
2616-maximal-score-after-applying-k-operations
2626-count-the-number-of-good-subarrays
2634-minimum-common-value
2636-maximum-subsequence-score
2640-maximum-number-of-integers-to-choose-from-a-range-i
2662-check-knight-tour-configuration
2676-find-the-score-of-all-prefixes-of-an-array
2681-put-marbles-in-bags
2685-first-completely-painted-row-or-column
2691-count-vowel-strings-in-ranges
2695-find-score-of-an-array-after-marking-all-elements
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
2711-minimum-time-to-visit-a-cell-in-a-grid
2727-number-of-senior-citizens
2764-maximum-number-of-fish-in-a-grid
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
2794-maximum-number-of-moves-in-a-grid
2844-sum-of-squares-of-special-elements
2855-maximum-number-of-jumps-to-reach-the-last-index
2856-count-complete-subarrays-in-an-array
2868-continuous-subarrays
2888-minimum-index-of-a-valid-split
2977-check-if-a-string-is-an-acronym-of-words
3031-construct-product-matrix
3176-minimum-sum-of-mountain-triplets-i
3181-find-building-where-alice-and-bob-can-meet
3219-make-lexicographically-smallest-array-by-swapping-elements
3221-find-the-peaks
3227-find-missing-and-repeated-values
3235-minimum-cost-to-convert-string-i
3242-count-elements-with-maximum-frequency
3251-maximum-area-of-longest-diagonal-rectangle
3262-find-polygon-with-the-largest-perimeter
3291-find-if-array-can-be-sorted
3309-count-prefix-and-suffix-pairs-i
3311-ant-on-the-boundary
3321-type-of-triangle
3329-find-the-length-of-the-longest-common-prefix
3332-minimum-operations-to-exceed-threshold-value-ii
3380-shortest-subarray-with-or-at-least-k-ii
3383-taking-maximum-energy-from-the-mystic-dungeon
3416-sum-of-digit-differences-of-all-pairs
3427-special-array-ii
3428-find-the-xor-of-numbers-which-appear-twice
3429-special-array-i
3430-count-days-without-meetings
3433-count-mentions-per-user
3434-find-the-number-of-distinct-colors-among-the-balls
3461-find-the-minimum-area-to-cover-all-ones-i
3463-alternating-groups-i
3471-minimum-average-of-smallest-and-largest-elements
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3517-shortest-distance-after-road-addition-queries-i
3522-find-the-power-of-k-size-subarrays-i
3523-find-the-power-of-k-size-subarrays-ii
3555-final-array-state-after-k-multiplication-operations-i
3558-find-a-safe-walk-through-a-grid
3616-make-array-elements-equal-to-zero
3621-minimum-operations-to-make-array-values-equal-to-k
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3639-zero-array-transformation-i
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3657-check-if-grid-can-be-cut-into-sections
3685-count-subarrays-of-length-three-with-a-condition
3744-minimum-operations-to-make-array-elements-zero
3778-transform-array-by-parity
3788-maximum-unique-subarray-sum-after-deletion
3797-design-spreadsheet
3819-count-covered-buildings
3827-implement-router
3894-maximize-ysum-by-picking-a-triplet-of-distinct-xvalues

Matrix

0036-valid-sudoku
0037-sudoku-solver
0048-rotate-image
0054-spiral-matrix
0059-spiral-matrix-ii
0063-unique-paths-ii
0064-minimum-path-sum
0073-set-matrix-zeroes
0074-search-a-2d-matrix
0079-word-search
0130-surrounded-regions
0200-number-of-islands
0212-word-search-ii
0221-maximal-square
0289-game-of-life
0304-range-sum-query-2d-immutable
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0419-battleships-in-a-board
0463-island-perimeter
0498-diagonal-traverse
0529-minesweeper
0542-01-matrix
0695-max-area-of-island
0733-flood-fill
0787-sliding-puzzle
0794-swim-in-rising-water
0810-valid-tic-tac-toe-state
0825-max-increase-to-keep-city-skyline
0861-flipping-an-image
0898-transpose-matrix
0919-projection-area-of-3d-shapes
0967-minimum-falling-path-sum
0971-shortest-bridge
0999-regions-cut-by-slashes
1022-unique-paths-iii
1036-rotting-oranges
1041-available-captures-for-rook
1073-number-of-enclaves
1104-coloring-a-border
1147-flip-columns-for-maximum-number-of-equal-rows
1171-shortest-path-in-binary-matrix
1329-sort-the-matrix-diagonally
1331-path-with-maximum-gold
1342-queens-that-can-attack-the-king
1396-count-servers-that-communicate
1400-find-winner-on-a-tic-tac-toe-game
1402-count-square-submatrices-with-all-ones
1414-shortest-path-in-a-grid-with-obstacles-elimination
1476-count-negative-numbers-in-a-sorted-matrix
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1663-detect-cycles-in-2d-grid
1677-matrix-diagonal-sum
1704-special-positions-in-a-binary-matrix
1706-where-will-the-ball-fall
1876-map-of-highest-peak
1905-count-sub-islands
1972-rotating-the-box
2038-nearest-exit-from-entrance-in-maze
2080-check-if-move-is-legal
2089-maximum-matrix-sum
2103-find-all-groups-of-farmland
2132-convert-1d-array-into-2d-array
2145-grid-game
2160-minimum-operations-to-make-a-uni-value-grid
2244-number-of-laser-beams-in-a-bank
2343-count-unguarded-cells-in-the-grid
2375-minimum-obstacle-removal-to-reach-corner
2428-equal-row-and-column-pairs
2454-largest-local-values-in-a-matrix
2588-maximum-number-of-points-from-grid-queries
2662-check-knight-tour-configuration
2685-first-completely-painted-row-or-column
2711-minimum-time-to-visit-a-cell-in-a-grid
2764-maximum-number-of-fish-in-a-grid
2794-maximum-number-of-moves-in-a-grid
3031-construct-product-matrix
3227-find-missing-and-repeated-values
3461-find-the-minimum-area-to-cover-all-ones-i
3558-find-a-safe-walk-through-a-grid
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3797-design-spreadsheet

Tree

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0099-recover-binary-search-tree
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0109-convert-sorted-list-to-binary-search-tree
0110-balanced-binary-tree
0112-path-sum
0113-path-sum-ii
0114-flatten-binary-tree-to-linked-list
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0331-verify-preorder-serialization-of-a-binary-tree
0404-sum-of-left-leaves
0437-path-sum-iii
0449-serialize-and-deserialize-bst
0450-delete-node-in-a-bst
0508-most-frequent-subtree-sum
0513-find-bottom-left-tree-value
0515-find-largest-value-in-each-tree-row
0538-convert-bst-to-greater-tree
0543-diameter-of-binary-tree
0606-construct-string-from-binary-tree
0623-add-one-row-to-tree
0652-find-duplicate-subtrees
0662-maximum-width-of-binary-tree
0671-second-minimum-node-in-a-binary-tree
0687-longest-univalue-path
0774-maximum-depth-of-n-ary-tree
0775-n-ary-tree-preorder-traversal
0776-n-ary-tree-postorder-traversal
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0799-minimum-distance-between-bst-nodes
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0988-flip-equivalent-binary-trees
0998-check-completeness-of-a-binary-tree
1005-univalued-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1030-smallest-string-starting-from-leaf
1035-cousins-in-binary-tree
1079-sum-of-root-to-leaf-binary-numbers
1114-binary-search-tree-to-greater-sum-tree
1116-maximum-level-sum-of-a-binary-tree
1243-sum-of-nodes-with-even-valued-grandparent
1387-find-elements-in-a-contaminated-binary-tree
1465-maximum-product-of-splitted-binary-tree
1474-longest-zigzag-path-in-a-binary-tree
1492-time-needed-to-inform-all-employees
1493-frog-position-after-t-seconds
1544-count-good-nodes-in-binary-tree
1643-number-of-nodes-in-the-sub-tree-with-the-same-label
2175-count-nodes-with-the-highest-score
2306-create-binary-tree-from-descriptions
2384-root-equals-sum-of-children
2416-evaluate-boolean-binary-tree
2445-reachable-nodes-with-restrictions
2461-amount-of-time-for-binary-tree-to-be-infected
2493-reverse-odd-levels-of-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii
3439-find-minimum-diameter-after-merging-two-trees

Binary Search Tree

0004-median-of-two-sorted-arrays
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0069-sqrtx
0074-search-a-2d-matrix
0081-search-in-rotated-sorted-array-ii
0098-validate-binary-search-tree
0099-recover-binary-search-tree
0108-convert-sorted-array-to-binary-search-tree
0109-convert-sorted-list-to-binary-search-tree
0153-find-minimum-in-rotated-sorted-array
0162-find-peak-element
0167-two-sum-ii-input-array-is-sorted
0173-binary-search-tree-iterator
0209-minimum-size-subarray-sum
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0268-missing-number
0275-h-index-ii
0278-first-bad-version
0287-find-the-duplicate-number
0300-longest-increasing-subsequence
0350-intersection-of-two-arrays-ii
0367-valid-perfect-square
0374-guess-number-higher-or-lower
0441-arranging-coins
0449-serialize-and-deserialize-bst
0450-delete-node-in-a-bst
0538-convert-bst-to-greater-tree
0540-single-element-in-a-sorted-array
0611-valid-triangle-number
0633-sum-of-square-numbers
0729-my-calendar-i
0745-find-smallest-letter-greater-than-target
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0792-binary-search
0794-swim-in-rising-water
0799-minimum-distance-between-bst-nodes
0882-peak-index-in-a-mountain-array
0892-shortest-subarray-with-sum-at-least-k
0907-koko-eating-bananas
1023-time-based-key-value-store
1046-max-consecutive-ones-iii
1114-binary-search-tree-to-greater-sum-tree
1232-sum-of-mutated-array-closest-to-target
1335-maximum-candies-allocated-to-k-children
1397-search-suggestions-system
1468-check-if-n-and-its-double-exist
1476-count-negative-numbers-in-a-sorted-matrix
1646-kth-missing-positive-number
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1766-minimum-number-of-removals-to-make-mountain-array
1776-minimum-operations-to-reduce-x-to-zero
1886-minimum-limit-of-balls-in-a-bag
2006-find-the-student-that-will-replace-the-chalk
2134-maximize-the-confusion-of-an-exam
2164-two-best-non-overlapping-events
2179-most-beautiful-item-for-each-query
2188-minimized-maximum-of-products-distributed-to-any-store
2280-count-good-triplets-in-an-array
2334-number-of-flowers-in-full-bloom
2512-longest-uploaded-prefix
2586-longest-square-streak-in-an-array
2634-minimum-common-value
2640-maximum-number-of-integers-to-choose-from-a-range-i
2699-count-the-number-of-fair-pairs
3181-find-building-where-alice-and-bob-can-meet
3427-special-array-ii
3827-implement-router

Binary Tree

0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0099-recover-binary-search-tree
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0109-convert-sorted-list-to-binary-search-tree
0110-balanced-binary-tree
0112-path-sum
0113-path-sum-ii
0114-flatten-binary-tree-to-linked-list
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0173-binary-search-tree-iterator
0199-binary-tree-right-side-view
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0331-verify-preorder-serialization-of-a-binary-tree
0404-sum-of-left-leaves
0437-path-sum-iii
0449-serialize-and-deserialize-bst
0450-delete-node-in-a-bst
0508-most-frequent-subtree-sum
0513-find-bottom-left-tree-value
0515-find-largest-value-in-each-tree-row
0538-convert-bst-to-greater-tree
0543-diameter-of-binary-tree
0606-construct-string-from-binary-tree
0623-add-one-row-to-tree
0652-find-duplicate-subtrees
0662-maximum-width-of-binary-tree
0671-second-minimum-node-in-a-binary-tree
0687-longest-univalue-path
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree
0789-kth-largest-element-in-a-stream
0799-minimum-distance-between-bst-nodes
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0988-flip-equivalent-binary-trees
0998-check-completeness-of-a-binary-tree
1005-univalued-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1030-smallest-string-starting-from-leaf
1035-cousins-in-binary-tree
1079-sum-of-root-to-leaf-binary-numbers
1114-binary-search-tree-to-greater-sum-tree
1116-maximum-level-sum-of-a-binary-tree
1243-sum-of-nodes-with-even-valued-grandparent
1387-find-elements-in-a-contaminated-binary-tree
1465-maximum-product-of-splitted-binary-tree
1474-longest-zigzag-path-in-a-binary-tree
1544-count-good-nodes-in-binary-tree
2175-count-nodes-with-the-highest-score
2306-create-binary-tree-from-descriptions
2384-root-equals-sum-of-children
2416-evaluate-boolean-binary-tree
2461-amount-of-time-for-binary-tree-to-be-infected
2493-reverse-odd-levels-of-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2646-kth-largest-sum-in-a-binary-tree
2677-cousins-in-binary-tree-ii

Two Pointers

0005-longest-palindromic-substring
0011-container-with-most-water
0015-3sum
0018-4sum
0019-remove-nth-node-from-end-of-list
0026-remove-duplicates-from-sorted-array
0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string
0042-trapping-rain-water
0061-rotate-list
0075-sort-colors
0080-remove-duplicates-from-sorted-array-ii
0082-remove-duplicates-from-sorted-list-ii
0086-partition-list
0125-valid-palindrome
0141-linked-list-cycle
0142-linked-list-cycle-ii
0143-reorder-list
0148-sort-list
0151-reverse-words-in-a-string
0160-intersection-of-two-linked-lists
0167-two-sum-ii-input-array-is-sorted
0189-rotate-array
0234-palindrome-linked-list
0283-move-zeroes
0287-find-the-duplicate-number
0295-find-median-from-data-stream
0344-reverse-string
0350-intersection-of-two-arrays-ii
0392-is-subsequence
0443-string-compression
0455-assign-cookies
0524-longest-word-in-dictionary-through-deleting
0528-swapping-nodes-in-a-linked-list
0611-valid-triangle-number
0633-sum-of-square-numbers
0680-valid-palindrome-ii
0768-partition-labels
0861-flipping-an-image
0868-push-dominoes
0908-middle-of-the-linked-list
0917-boats-to-save-people
0979-di-string-match
1468-check-if-n-and-its-double-exist
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1679-shortest-subarray-to-be-removed-to-make-array-sorted
1750-minimum-length-of-string-after-deleting-similar-ends
1798-max-number-of-k-sum-pairs
1880-largest-merge-of-two-strings
1894-merge-strings-alternately
1972-rotating-the-box
1988-minimize-maximum-pair-sum-in-array
2095-minimum-number-of-swaps-to-make-the-string-balanced
2216-delete-the-middle-node-of-a-linked-list
2231-find-first-palindromic-string-in-the-array
2232-adding-spaces-to-a-string
2236-maximum-twin-sum-of-a-linked-list
2271-rearrange-array-elements-by-sign
2414-move-pieces-to-obtain-a-string
2481-strictly-palindromic-number
2488-divide-intervals-into-minimum-number-of-groups
2551-apply-operations-to-an-array
2553-total-cost-to-hire-k-workers
2561-number-of-distinct-averages
2581-divide-players-into-teams-of-equal-skill
2588-maximum-number-of-points-from-grid-queries
2634-minimum-common-value
2699-count-the-number-of-fair-pairs
2707-merge-two-2d-arrays-by-summing-values
2816-lexicographically-smallest-palindrome
3018-make-string-a-subsequence-using-cyclic-increments
3195-separate-black-and-white-balls
3471-minimum-average-of-smallest-and-largest-elements

Brainteaser

0292-nim-game
1627-last-moment-before-all-ants-fall-out-of-a-plank
2481-strictly-palindromic-number
2533-bitwise-xor-of-all-pairings
3462-vowels-game-in-a-string

Breadth-First Search

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0103-binary-tree-zigzag-level-order-traversal
0104-maximum-depth-of-binary-tree
0112-path-sum
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0127-word-ladder
0130-surrounded-regions
0133-clone-graph
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0226-invert-binary-tree
0322-coin-change
0399-evaluate-division
0404-sum-of-left-leaves
0407-trapping-rain-water-ii
0417-pacific-atlantic-water-flow
0433-minimum-genetic-mutation
0449-serialize-and-deserialize-bst
0463-island-perimeter
0513-find-bottom-left-tree-value
0515-find-largest-value-in-each-tree-row
0529-minesweeper
0542-01-matrix
0547-number-of-provinces
0623-add-one-row-to-tree
0662-maximum-width-of-binary-tree
0684-redundant-connection
0695-max-area-of-island
0733-flood-fill
0744-network-delay-time
0774-maximum-depth-of-n-ary-tree
0787-sliding-puzzle
0794-swim-in-rising-water
0799-minimum-distance-between-bst-nodes
0801-is-graph-bipartite
0820-find-eventual-safe-states
0869-similar-string-groups
0871-keys-and-rooms
0922-possible-bipartition
0960-minimize-malware-spread
0971-shortest-bridge
0998-check-completeness-of-a-binary-tree
0999-regions-cut-by-slashes
1005-univalued-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1035-cousins-in-binary-tree
1036-rotting-oranges
1073-number-of-enclaves
1104-coloring-a-border
1106-escape-a-large-maze
1116-maximum-level-sum-of-a-binary-tree
1171-shortest-path-in-binary-matrix
1243-sum-of-nodes-with-even-valued-grandparent
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1414-shortest-path-in-a-grid-with-obstacles-elimination
1424-maximum-candies-you-can-get-from-boxes
1428-jump-game-iii
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1442-number-of-operations-to-make-network-connected
1447-jump-game-iv
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1492-time-needed-to-inform-all-employees
1493-frog-position-after-t-seconds
1544-count-good-nodes-in-binary-tree
1576-reorder-routes-to-make-all-paths-lead-to-the-city-zero
1643-number-of-nodes-in-the-sub-tree-with-the-same-label
1663-detect-cycles-in-2d-grid
1876-map-of-highest-peak
1905-count-sub-islands
2038-nearest-exit-from-entrance-in-maze
2103-find-all-groups-of-farmland
2121-find-if-path-exists-in-graph
2206-detonate-the-maximum-bombs
2375-minimum-obstacle-removal-to-reach-corner
2403-count-unreachable-pairs-of-nodes-in-an-undirected-graph
2445-reachable-nodes-with-restrictions
2461-amount-of-time-for-binary-tree-to-be-infected
2493-reverse-odd-levels-of-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2558-minimum-number-of-operations-to-sort-a-binary-tree-by-level
2588-maximum-number-of-points-from-grid-queries
2646-kth-largest-sum-in-a-binary-tree
2662-check-knight-tour-configuration
2671-shortest-cycle-in-a-graph
2677-cousins-in-binary-tree-ii
2711-minimum-time-to-visit-a-cell-in-a-grid
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components
3239-minimum-number-of-operations-to-make-x-and-y-equal
3271-count-the-number-of-houses-at-a-certain-distance-i
3386-find-edges-in-shortest-paths
3439-find-minimum-diameter-after-merging-two-trees
3517-shortest-distance-after-road-addition-queries-i
3558-find-a-safe-walk-through-a-grid
3561-remove-methods-from-project

String

0003-longest-substring-without-repeating-characters
0005-longest-palindromic-substring
0006-zigzag-conversion
0008-string-to-integer-atoi
0010-regular-expression-matching
0012-integer-to-roman
0013-roman-to-integer
0014-longest-common-prefix
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0028-find-the-index-of-the-first-occurrence-in-a-string
0038-count-and-say
0043-multiply-strings
0049-group-anagrams
0058-length-of-last-word
0068-text-justification
0071-simplify-path
0072-edit-distance
0079-word-search
0125-valid-palindrome
0127-word-ladder
0151-reverse-words-in-a-string
0166-fraction-to-recurring-decimal
0168-excel-sheet-column-title
0171-excel-sheet-column-number
0179-largest-number
0205-isomorphic-strings
0208-implement-trie-prefix-tree
0211-design-add-and-search-words-data-structure
0212-word-search-ii
0214-shortest-palindrome
0224-basic-calculator
0227-basic-calculator-ii
0242-valid-anagram
0257-binary-tree-paths
0273-integer-to-english-words
0282-expression-add-operators
0290-word-pattern
0299-bulls-and-cows
0316-remove-duplicate-letters
0331-verify-preorder-serialization-of-a-binary-tree
0336-palindrome-pairs
0344-reverse-string
0387-first-unique-character-in-a-string
0392-is-subsequence
0394-decode-string
0399-evaluate-division
0402-remove-k-digits
0412-fizz-buzz
0415-add-strings
0424-longest-repeating-character-replacement
0433-minimum-genetic-mutation
0443-string-compression
0449-serialize-and-deserialize-bst
0451-sort-characters-by-frequency
0468-validate-ip-address
0474-ones-and-zeroes
0500-keyboard-row
0520-detect-capital
0524-longest-word-in-dictionary-through-deleting
0535-encode-and-decode-tinyurl
0539-minimum-time-difference
0583-delete-operation-for-two-strings
0606-construct-string-from-binary-tree
0609-find-duplicate-file-in-system
0649-dota2-senate
0657-robot-return-to-origin
0678-valid-parenthesis-string
0680-valid-palindrome-ii
0692-top-k-frequent-words
0720-longest-word-in-dictionary
0726-number-of-atoms
0768-partition-labels
0778-reorganize-string
0800-letter-case-permutation
0812-rotate-string
0839-short-encoding-of-words
0868-push-dominoes
0869-similar-string-groups
0878-shifting-letters
0957-minimum-add-to-make-parentheses-valid
0979-di-string-match
1023-time-based-key-value-store
1030-smallest-string-starting-from-leaf
1032-satisfiability-of-equality-equations
1045-check-if-word-is-valid-after-substitutions
1058-lexicographically-smallest-equivalent-string
1097-stream-of-characters
1119-robot-bounded-in-circle
1128-remove-all-adjacent-duplicates-in-string
1146-greatest-common-divisor-of-strings
1160-letter-tile-possibilities
1197-parsing-a-boolean-expression
1250-longest-common-subsequence
1252-break-a-palindrome
1260-day-of-the-year
1272-invalid-transactions
1297-maximum-number-of-balloons
1302-delete-characters-to-make-fancy-string
1304-longest-happy-string
1320-remove-all-adjacent-duplicates-in-string-ii
1350-remove-sub-folders-from-the-filesystem
1353-find-resultant-array-after-removing-anagrams
1371-minimum-remove-to-make-valid-parentheses
1397-search-suggestions-system
1430-find-the-k-beauty-of-a-number
1449-print-words-vertically
1460-number-of-substrings-containing-all-three-characters
1490-generate-a-string-with-characters-that-have-odd-counts
1502-construct-k-palindrome-strings
1508-longest-happy-prefix
1512-design-underground-system
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1524-string-matching-in-an-array
1537-maximum-score-after-splitting-a-string
1547-destination-city
1561-rearrange-words-in-a-sentence
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
1567-maximum-number-of-vowels-in-a-substring-of-given-length
1619-path-crossing
1632-number-of-good-ways-to-split-a-string
1647-minimum-deletions-to-make-character-frequencies-unique
1667-find-kth-bit-in-nth-binary-string
1714-rearrange-spaces-between-words
1715-split-a-string-into-the-max-number-of-unique-substrings
1720-crawler-log-folder
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1750-minimum-length-of-string-after-deleting-similar-ends
1777-determine-if-two-strings-are-close
1818-maximum-score-from-removing-substrings
1880-largest-merge-of-two-strings
1885-count-number-of-homogenous-substrings
1894-merge-strings-alternately
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1915-check-if-one-string-swap-can-make-strings-equal
1920-determine-color-of-a-chessboard-square
1934-evaluate-the-bracket-pairs-of-a-string
1960-check-if-the-sentence-is-pangram
2021-remove-all-occurrences-of-a-substring
2059-unique-length-3-palindromic-subsequences
2076-sum-of-digits-of-string-after-convert
2095-minimum-number-of-swaps-to-make-the-string-balanced
2107-find-unique-binary-string
2133-number-of-pairs-of-strings-with-concatenation-equal-to-target
2134-maximize-the-confusion-of-an-exam
2154-minimum-moves-to-convert-string
2197-decode-the-slanted-ciphertext
2220-find-all-possible-recipes-from-given-supplies
2221-check-if-a-parentheses-string-can-be-valid
2231-find-first-palindromic-string-in-the-array
2232-adding-spaces-to-a-string
2243-check-if-all-as-appears-before-all-bs
2244-number-of-laser-beams-in-a-bank
2300-construct-string-with-repeat-limit
2317-count-collisions-on-a-road
2345-minimum-number-of-operations-to-convert-time
2346-largest-3-same-digit-number-in-string
2390-naming-a-company
2391-strong-password-checker-ii
2406-decode-the-message
2414-move-pieces-to-obtain-a-string
2429-design-a-food-rating-system
2456-construct-smallest-number-from-di-string
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2465-shifting-letters-ii
2470-removing-stars-from-a-string
2487-optimal-partition-of-string
2492-length-of-the-longest-alphabetical-continuous-substring
2494-sum-of-prefix-scores-of-strings
2536-determine-if-two-events-have-conflict
2543-most-popular-video-creator
2550-words-within-two-edits-of-dictionary
2576-minimum-penalty-for-a-shop
2580-circular-sentence
2598-shortest-distance-to-target-string-in-a-circular-array
2599-take-k-of-each-character-from-left-and-right
2691-count-vowel-strings-in-ranges
2727-number-of-senior-citizens
2816-lexicographically-smallest-palindrome
2887-sort-vowels-in-a-string
2977-check-if-a-string-is-an-acronym-of-words
3018-make-string-a-subsequence-using-cyclic-increments
3150-shortest-and-lexicographically-smallest-beautiful-string
3174-minimum-number-of-changes-to-make-binary-string-beautiful
3195-separate-black-and-white-balls
3211-generate-binary-strings-without-adjacent-zeros
3235-minimum-cost-to-convert-string-i
3309-count-prefix-and-suffix-pairs-i
3329-find-the-length-of-the-longest-common-prefix
3379-score-of-a-string
3396-valid-word
3447-clear-digits
3451-string-compression-iii
3455-minimum-length-of-string-after-operations
3462-vowels-game-in-a-string
3493-maximum-number-of-operations-to-move-ones-to-the-end
3629-total-characters-in-string-after-transformations-i
3684-substring-matching-pattern
3753-maximum-difference-between-even-and-odd-frequency-i
3797-design-spreadsheet
3872-find-most-frequent-vowel-and-consonant

Bit Manipulation

0029-divide-two-integers
0078-subsets
0090-subsets-ii
0136-single-number
0191-number-of-1-bits
0201-bitwise-and-of-numbers-range
0231-power-of-two
0260-single-number-iii
0268-missing-number
0287-find-the-duplicate-number
0338-counting-bits
0342-power-of-four
0461-hamming-distance
0476-number-complement
0477-total-hamming-distance
0645-set-mismatch
0800-letter-case-permutation
0861-flipping-an-image
1018-binary-prefix-divisible-by-5
1022-unique-paths-iii
1037-minimum-number-of-k-consecutive-bit-flips
1441-minimum-flips-to-make-a-or-b-equal-to-c
1632-number-of-good-ways-to-split-a-string
1940-maximum-xor-for-each-query
1993-sum-of-all-subset-xor-totals
2059-unique-length-3-palindromic-subsequences
2170-count-number-of-maximum-bitwise-or-subsets
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2390-naming-a-company
2478-longest-nice-subarray
2509-minimize-xor
2533-bitwise-xor-of-all-pairings
2766-find-the-prefix-common-array-of-two-arrays
2792-neighboring-bitwise-xor
3211-generate-binary-strings-without-adjacent-zeros
3291-find-if-array-can-be-sorted
3380-shortest-subarray-with-or-at-least-k-ii
3394-minimum-array-end
3428-find-the-xor-of-numbers-which-appear-twice
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3676-smallest-number-with-all-set-bits
3744-minimum-operations-to-make-array-elements-zero

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0012-integer-to-roman
0013-roman-to-integer
0017-letter-combinations-of-a-phone-number
0036-valid-sudoku
0037-sudoku-solver
0041-first-missing-positive
0049-group-anagrams
0073-set-matrix-zeroes
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0127-word-ladder
0128-longest-consecutive-sequence
0133-clone-graph
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0142-linked-list-cycle-ii
0149-max-points-on-a-line
0160-intersection-of-two-linked-lists
0166-fraction-to-recurring-decimal
0169-majority-element
0205-isomorphic-strings
0208-implement-trie-prefix-tree
0217-contains-duplicate
0219-contains-duplicate-ii
0242-valid-anagram
0268-missing-number
0290-word-pattern
0299-bulls-and-cows
0336-palindrome-pairs
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0387-first-unique-character-in-a-string
0391-perfect-rectangle
0398-random-pick-index
0424-longest-repeating-character-replacement
0433-minimum-genetic-mutation
0442-find-all-duplicates-in-an-array
0448-find-all-numbers-disappeared-in-an-array
0451-sort-characters-by-frequency
0496-next-greater-element-i
0500-keyboard-row
0508-most-frequent-subtree-sum
0535-encode-and-decode-tinyurl
0554-brick-wall
0560-subarray-sum-equals-k
0609-find-duplicate-file-in-system
0621-task-scheduler
0645-set-mismatch
0652-find-duplicate-subtrees
0692-top-k-frequent-words
0720-longest-word-in-dictionary
0726-number-of-atoms
0768-partition-labels
0778-reorganize-string
0797-rabbits-in-forest
0817-design-hashmap
0835-linked-list-components
0839-short-encoding-of-words
0869-similar-string-groups
0876-hand-of-straights
0905-length-of-longest-fibonacci-subsequence
0906-walking-robot-simulation
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0960-minimize-malware-spread
0999-regions-cut-by-slashes
1010-powerful-integers
1023-time-based-key-value-store
1029-vertical-order-traversal-of-a-binary-tree
1039-find-the-town-judge
1106-escape-a-large-maze
1147-flip-columns-for-maximum-number-of-equal-rows
1160-letter-tile-possibilities
1169-largest-values-from-labels
1227-number-of-equivalent-domino-pairs
1256-rank-transform-of-an-array
1272-invalid-transactions
1297-maximum-number-of-balloons
1312-count-artifacts-that-can-be-extracted
1319-unique-number-of-occurrences
1353-find-resultant-array-after-removing-anagrams
1354-find-players-with-zero-or-one-losses
1364-tuple-with-same-product
1365-how-many-numbers-are-smaller-than-the-current-number
1387-find-elements-in-a-contaminated-binary-tree
1400-find-winner-on-a-tic-tac-toe-game
1422-divide-array-in-sets-of-k-consecutive-numbers
1447-jump-game-iv
1460-number-of-substrings-containing-all-three-characters
1468-check-if-n-and-its-double-exist
1502-construct-k-palindrome-strings
1512-design-underground-system
1547-destination-city
1619-path-crossing
1620-check-if-array-pairs-are-divisible-by-k
1632-number-of-good-ways-to-split-a-string
1643-number-of-nodes-in-the-sub-tree-with-the-same-label
1647-minimum-deletions-to-make-character-frequencies-unique
1694-make-sum-divisible-by-p
1715-split-a-string-into-the-max-number-of-unique-substrings
1776-minimum-operations-to-reduce-x-to-zero
1777-determine-if-two-strings-are-close
1798-max-number-of-k-sum-pairs
1813-maximum-erasure-value
1834-minimum-number-of-people-to-teach
1866-restore-the-array-from-adjacent-pairs
1915-check-if-one-string-swap-can-make-strings-equal
1925-count-nice-pairs-in-an-array
1934-evaluate-the-bracket-pairs-of-a-string
1960-check-if-the-sentence-is-pangram
2023-design-movie-rental-system
2054-the-number-of-the-smallest-unoccupied-chair
2059-unique-length-3-palindromic-subsequences
2107-find-unique-binary-string
2116-count-number-of-pairs-with-absolute-difference-k
2129-number-of-pairs-of-interchangeable-rectangles
2133-number-of-pairs-of-strings-with-concatenation-equal-to-target
2169-simple-bank-system
2220-find-all-possible-recipes-from-given-supplies
2274-keep-multiplying-found-values-by-two
2300-construct-string-with-repeat-limit
2306-create-binary-tree-from-descriptions
2308-divide-array-into-equal-pairs
2334-number-of-flowers-in-full-bloom
2339-k-divisible-elements-subarrays
2356-largest-combination-with-bitwise-and-greater-than-zero
2390-naming-a-company
2406-decode-the-message
2413-smallest-number-in-infinite-set
2428-equal-row-and-column-pairs
2429-design-a-food-rating-system
2434-design-a-number-container-system
2445-reachable-nodes-with-restrictions
2447-merge-similar-items
2448-count-number-of-bad-pairs
2461-amount-of-time-for-binary-tree-to-be-infected
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2483-task-scheduler-ii
2487-optimal-partition-of-string
2525-count-number-of-distinct-integers-after-reverse-operations
2543-most-popular-video-creator
2552-maximum-sum-of-distinct-subarrays-with-length-k
2561-number-of-distinct-averages
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2599-take-k-of-each-character-from-left-and-right
2626-count-the-number-of-good-subarrays
2634-minimum-common-value
2640-maximum-number-of-integers-to-choose-from-a-range-i
2677-cousins-in-binary-tree-ii
2685-first-completely-painted-row-or-column
2695-find-score-of-an-array-after-marking-all-elements
2707-merge-two-2d-arrays-by-summing-values
2766-find-the-prefix-common-array-of-two-arrays
2824-check-if-the-number-is-fascinating
2856-count-complete-subarrays-in-an-array
2888-minimum-index-of-a-valid-split
3227-find-missing-and-repeated-values
3242-count-elements-with-maximum-frequency
3329-find-the-length-of-the-longest-common-prefix
3416-sum-of-digit-differences-of-all-pairs
3428-find-the-xor-of-numbers-which-appear-twice
3434-find-the-number-of-distinct-colors-among-the-balls
3455-minimum-length-of-string-after-operations
3621-minimum-operations-to-make-array-values-equal-to-k
3629-total-characters-in-string-after-transformations-i
3656-minimum-number-of-operations-to-make-elements-in-array-distinct
3753-maximum-difference-between-even-and-odd-frequency-i
3788-maximum-unique-subarray-sum-after-deletion
3797-design-spreadsheet
3819-count-covered-buildings
3827-implement-router
3872-find-most-frequent-vowel-and-consonant
3894-maximize-ysum-by-picking-a-triplet-of-distinct-xvalues

Trie

0014-longest-common-prefix
0208-implement-trie-prefix-tree
0211-design-add-and-search-words-data-structure
0212-word-search-ii
0336-palindrome-pairs
0386-lexicographical-numbers
0692-top-k-frequent-words
0720-longest-word-in-dictionary
0839-short-encoding-of-words
1097-stream-of-characters
1350-remove-sub-folders-from-the-filesystem
1397-search-suggestions-system
2339-k-divisible-elements-subarrays
2494-sum-of-prefix-scores-of-strings
2550-words-within-two-edits-of-dictionary
3309-count-prefix-and-suffix-pairs-i
3329-find-the-length-of-the-longest-common-prefix

Sorting

0015-3sum
0018-4sum
0049-group-anagrams
0056-merge-intervals
0075-sort-colors
0147-insertion-sort-list
0148-sort-list
0164-maximum-gap
0169-majority-element
0179-largest-number
0215-kth-largest-element-in-an-array
0217-contains-duplicate
0242-valid-anagram
0268-missing-number
0295-find-median-from-data-stream
0347-top-k-frequent-elements
0350-intersection-of-two-arrays-ii
0368-largest-divisible-subset
0414-third-maximum-number
0435-non-overlapping-intervals
0451-sort-characters-by-frequency
0452-minimum-number-of-arrows-to-burst-balloons
0455-assign-cookies
0462-minimum-moves-to-equal-array-elements-ii
0524-longest-word-in-dictionary-through-deleting
0539-minimum-time-difference
0611-valid-triangle-number
0621-task-scheduler
0645-set-mismatch
0692-top-k-frequent-words
0720-longest-word-in-dictionary
0726-number-of-atoms
0778-reorganize-string
0780-max-chunks-to-make-sorted
0876-hand-of-straights
0917-boats-to-save-people
0948-sort-an-array
1029-vertical-order-traversal-of-a-binary-tree
1137-height-checker
1169-largest-values-from-labels
1184-car-pooling
1222-remove-covered-intervals
1232-sum-of-mutated-array-closest-to-target
1256-rank-transform-of-an-array
1272-invalid-transactions
1329-sort-the-matrix-diagonally
1353-find-resultant-array-after-removing-anagrams
1354-find-players-with-zero-or-one-losses
1365-how-many-numbers-are-smaller-than-the-current-number
1397-search-suggestions-system
1422-divide-array-in-sets-of-k-consecutive-numbers
1468-check-if-n-and-its-double-exist
1499-maximum-performance-of-a-team
1539-diagonal-traverse-ii
1561-rearrange-words-in-a-sentence
1575-maximum-area-of-a-piece-of-cake-after-horizontal-and-vertical-cuts
1647-minimum-deletions-to-make-character-frequencies-unique
1777-determine-if-two-strings-are-close
1798-max-number-of-k-sum-pairs
1988-minimize-maximum-pair-sum-in-array
2160-minimum-operations-to-make-a-uni-value-grid
2164-two-best-non-overlapping-events
2179-most-beautiful-item-for-each-query
2245-destroying-asteroids
2274-keep-multiplying-found-values-by-two
2284-smallest-value-of-the-rearranged-number
2334-number-of-flowers-in-full-bloom
2367-minimum-lines-to-represent-a-line-chart
2447-merge-similar-items
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2488-divide-intervals-into-minimum-number-of-groups
2543-most-popular-video-creator
2554-minimum-total-distance-traveled
2561-number-of-distinct-averages
2581-divide-players-into-teams-of-equal-skill
2586-longest-square-streak-in-an-array
2588-maximum-number-of-points-from-grid-queries
2590-maximum-star-sum-of-a-graph
2636-maximum-subsequence-score
2640-maximum-number-of-integers-to-choose-from-a-range-i
2646-kth-largest-sum-in-a-binary-tree
2681-put-marbles-in-bags
2695-find-score-of-an-array-after-marking-all-elements
2699-count-the-number-of-fair-pairs
2887-sort-vowels-in-a-string
2888-minimum-index-of-a-valid-split
3219-make-lexicographically-smallest-array-by-swapping-elements
3262-find-polygon-with-the-largest-perimeter
3291-find-if-array-can-be-sorted
3321-type-of-triangle
3430-count-days-without-meetings
3433-count-mentions-per-user
3471-minimum-average-of-smallest-and-largest-elements
3657-check-if-grid-can-be-cut-into-sections
3778-transform-array-by-parity
3819-count-covered-buildings
3894-maximize-ysum-by-picking-a-triplet-of-distinct-xvalues

Heap (Priority Queue)

0023-merge-k-sorted-lists
0215-kth-largest-element-in-an-array
0239-sliding-window-maximum
0295-find-median-from-data-stream
0347-top-k-frequent-elements
0407-trapping-rain-water-ii
0451-sort-characters-by-frequency
0621-task-scheduler
0692-top-k-frequent-words
0744-network-delay-time
0778-reorganize-string
0789-kth-largest-element-in-a-stream
0794-swim-in-rising-water
0892-shortest-subarray-with-sum-at-least-k
0948-sort-an-array
1127-last-stone-weight
1184-car-pooling
1304-longest-happy-string
1325-path-with-maximum-probability
1397-search-suggestions-system
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1499-maximum-performance-of-a-team
1539-diagonal-traverse-ii
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1762-furthest-building-you-can-reach
1917-maximum-average-pass-ratio
1955-seat-reservation-manager
2023-design-movie-rental-system
2054-the-number-of-the-smallest-unoccupied-chair
2094-remove-stones-to-minimize-the-total
2164-two-best-non-overlapping-events
2300-construct-string-with-repeat-limit
2375-minimum-obstacle-removal-to-reach-corner
2413-smallest-number-in-infinite-set
2429-design-a-food-rating-system
2434-design-a-number-container-system
2473-max-sum-of-a-pair-with-equal-sum-of-digits
2488-divide-intervals-into-minimum-number-of-groups
2512-longest-uploaded-prefix
2543-most-popular-video-creator
2553-total-cost-to-hire-k-workers
2588-maximum-number-of-points-from-grid-queries
2590-maximum-star-sum-of-a-graph
2616-maximal-score-after-applying-k-operations
2636-maximum-subsequence-score
2681-put-marbles-in-bags
2695-find-score-of-an-array-after-marking-all-elements
2711-minimum-time-to-visit-a-cell-in-a-grid
2868-continuous-subarrays
3181-find-building-where-alice-and-bob-can-meet
3332-minimum-operations-to-exceed-threshold-value-ii
3386-find-edges-in-shortest-paths
3555-final-array-state-after-k-multiplication-operations-i
3558-find-a-safe-walk-through-a-grid
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii
3894-maximize-ysum-by-picking-a-triplet-of-distinct-xvalues

Bucket Sort

0164-maximum-gap
0347-top-k-frequent-elements
0451-sort-characters-by-frequency
0692-top-k-frequent-words
0948-sort-an-array

Counting

0169-majority-element
0299-bulls-and-cows
0347-top-k-frequent-elements
0387-first-unique-character-in-a-string
0451-sort-characters-by-frequency
0621-task-scheduler
0692-top-k-frequent-words
0778-reorganize-string
1160-letter-tile-possibilities
1169-largest-values-from-labels
1227-number-of-equivalent-domino-pairs
1297-maximum-number-of-balloons
1354-find-players-with-zero-or-one-losses
1364-tuple-with-same-product
1396-count-servers-that-communicate
1502-construct-k-palindrome-strings
1620-check-if-array-pairs-are-divisible-by-k
1643-number-of-nodes-in-the-sub-tree-with-the-same-label
1777-determine-if-two-strings-are-close
1915-check-if-one-string-swap-can-make-strings-equal
1925-count-nice-pairs-in-an-array
2116-count-number-of-pairs-with-absolute-difference-k
2129-number-of-pairs-of-interchangeable-rectangles
2133-number-of-pairs-of-strings-with-concatenation-equal-to-target
2300-construct-string-with-repeat-limit
2308-divide-array-into-equal-pairs
2356-largest-combination-with-bitwise-and-greater-than-zero
2448-count-number-of-bad-pairs
2494-sum-of-prefix-scores-of-strings
2525-count-number-of-distinct-integers-after-reverse-operations
3242-count-elements-with-maximum-frequency
3416-sum-of-digit-differences-of-all-pairs
3455-minimum-length-of-string-after-operations
3493-maximum-number-of-operations-to-move-ones-to-the-end
3629-total-characters-in-string-after-transformations-i
3753-maximum-difference-between-even-and-odd-frequency-i
3778-transform-array-by-parity
3872-find-most-frequent-vowel-and-consonant

Divide and Conquer

0004-median-of-two-sorted-arrays
0023-merge-k-sorted-lists
0053-maximum-subarray
0105-construct-binary-tree-from-preorder-and-inorder-traversal
0106-construct-binary-tree-from-inorder-and-postorder-traversal
0108-convert-sorted-array-to-binary-search-tree
0109-convert-sorted-list-to-binary-search-tree
0148-sort-list
0169-majority-element
0191-number-of-1-bits
0215-kth-largest-element-in-an-array
0307-range-sum-query-mutable
0347-top-k-frequent-elements
0925-construct-binary-tree-from-preorder-and-postorder-traversal
0948-sort-an-array
2280-count-good-triplets-in-an-array

Quickselect

0215-kth-largest-element-in-an-array
0347-top-k-frequent-elements

Geometry

0149-max-points-on-a-line
0223-rectangle-area
0391-perfect-rectangle
0593-valid-square
0915-generate-random-point-in-a-circle
0919-projection-area-of-3d-shapes
1349-check-if-it-is-a-straight-line
2206-detonate-the-maximum-bombs
2367-minimum-lines-to-represent-a-line-chart
2575-minimum-cuts-to-divide-a-circle

Radix Sort

0164-maximum-gap
0948-sort-an-array

Enumeration

0204-count-primes
1010-powerful-integers
1656-count-good-triplets
1993-sum-of-all-subset-xor-totals
2080-check-if-move-is-legal
2083-three-divisors
2170-count-number-of-maximum-bitwise-or-subsets
2339-k-divisible-elements-subarrays
2390-naming-a-company
2844-sum-of-squares-of-special-elements
2998-count-symmetric-integers
3199-distribute-candies-among-children-i
3221-find-the-peaks

Number Theory

0204-count-primes
0258-add-digits
2083-three-divisors
2106-find-greatest-common-divisor-of-array
2129-number-of-pairs-of-interchangeable-rectangles
2307-replace-non-coprime-numbers-in-array
2367-minimum-lines-to-represent-a-line-chart
2491-smallest-even-multiple
2610-closest-prime-numbers-in-range
2903-insert-greatest-common-divisors-in-linked-list

Dynamic Programming

0005-longest-palindromic-substring
0010-regular-expression-matching
0042-trapping-rain-water
0045-jump-game-ii
0053-maximum-subarray
0055-jump-game
0062-unique-paths
0063-unique-paths-ii
0064-minimum-path-sum
0070-climbing-stairs
0072-edit-distance
0118-pascals-triangle
0119-pascals-triangle-ii
0120-triangle
0121-best-time-to-buy-and-sell-stock
0122-best-time-to-buy-and-sell-stock-ii
0152-maximum-product-subarray
0188-best-time-to-buy-and-sell-stock-iv
0198-house-robber
0213-house-robber-ii
0221-maximal-square
0300-longest-increasing-subsequence
0309-best-time-to-buy-and-sell-stock-with-cooldown
0322-coin-change
0338-counting-bits
0368-largest-divisible-subset
0392-is-subsequence
0403-frog-jump
0416-partition-equal-subset-sum
0435-non-overlapping-intervals
0474-ones-and-zeroes
0494-target-sum
0518-coin-change-ii
0542-01-matrix
0583-delete-operation-for-two-strings
0650-2-keys-keyboard
0678-valid-parenthesis-string
0689-maximum-sum-of-3-non-overlapping-subarrays
0714-best-time-to-buy-and-sell-stock-with-transaction-fee
0747-min-cost-climbing-stairs
0764-largest-plus-sign
0806-domino-and-tromino-tiling
0815-champagne-tower
0868-push-dominoes
0905-length-of-longest-fibonacci-subsequence
0909-stone-game
0967-minimum-falling-path-sum
1013-fibonacci-number
1025-minimum-cost-for-tickets
1111-minimum-score-triangulation-of-polygon
1236-n-th-tribonacci-number
1250-longest-common-subsequence
1288-maximum-subarray-sum-with-one-deletion
1402-count-square-submatrices-with-all-ones
1474-longest-zigzag-path-in-a-binary-tree
1586-longest-subarray-of-1s-after-deleting-one-element
1632-number-of-good-ways-to-split-a-string
1744-number-of-ways-to-form-a-target-string-given-a-dictionary
1766-minimum-number-of-removals-to-make-mountain-array
1849-maximum-absolute-sum-of-any-subarray
2110-number-of-smooth-descent-periods-of-a-stock
2164-two-best-non-overlapping-events
2262-solving-questions-with-brainpower
2554-minimum-total-distance-traveled
2562-count-ways-to-build-good-strings
2586-longest-square-streak-in-an-array
2794-maximum-number-of-moves-in-a-grid
2855-maximum-number-of-jumps-to-reach-the-last-index
3239-minimum-number-of-operations-to-make-x-and-y-equal
3629-total-characters-in-string-after-transformations-i

Database

0175-combine-two-tables
0176-second-highest-salary
0177-nth-highest-salary
0180-consecutive-numbers
0181-employees-earning-more-than-their-managers
0182-duplicate-emails
0184-department-highest-salary
0185-department-top-three-salaries
0196-delete-duplicate-emails
0197-rising-temperature
0570-managers-with-at-least-5-direct-reports
0577-employee-bonus
0584-find-customer-referee
0585-investments-in-2016
0602-friend-requests-ii-who-has-the-most-friends
0626-exchange-seats
1258-article-views-i
1278-product-price-at-a-given-date
1292-immediate-food-delivery-ii
1327-last-person-to-fit-in-the-bus
1480-movie-rating
1509-replace-employee-id-with-the-unique-identifier
1523-capital-gainloss
1664-find-users-with-valid-e-mails
1908-recyclable-and-low-fat-products
2041-the-latest-login-in-2020
2057-count-salary-categories
3910-find-books-with-no-available-copies

Backtracking

0017-letter-combinations-of-a-phone-number
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0046-permutations
0047-permutations-ii
0051-n-queens
0052-n-queens-ii
0077-combinations
0078-subsets
0079-word-search
0090-subsets-ii
0113-path-sum-ii
0212-word-search-ii
0216-combination-sum-iii
0257-binary-tree-paths
0282-expression-add-operators
0494-target-sum
0800-letter-case-permutation
1022-unique-paths-iii
1030-smallest-string-starting-from-leaf
1160-letter-tile-possibilities
1331-path-with-maximum-gold
1516-the-k-th-lexicographical-string-of-all-happy-strings-of-length-n
1715-split-a-string-into-the-max-number-of-unique-substrings
1819-construct-the-lexicographically-largest-valid-sequence
1993-sum-of-all-subset-xor-totals
2107-find-unique-binary-string
2170-count-number-of-maximum-bitwise-or-subsets
2456-construct-smallest-number-from-di-string
2802-find-the-punishment-number-of-an-integer
3211-generate-binary-strings-without-adjacent-zeros

Prefix Sum

0209-minimum-size-subarray-sum
0238-product-of-array-except-self
0304-range-sum-query-2d-immutable
0560-subarray-sum-equals-k
0724-find-pivot-index
0878-shifting-letters
0892-shortest-subarray-with-sum-at-least-k
1037-minimum-number-of-k-consecutive-bit-flips
1046-max-consecutive-ones-iii
1184-car-pooling
1206-corporate-flight-bookings
1477-product-of-the-last-k-numbers
1537-maximum-score-after-splitting-a-string
1694-make-sum-divisible-by-p
1776-minimum-operations-to-reduce-x-to-zero
1833-find-the-highest-altitude
1895-minimum-number-of-operations-to-move-all-balls-to-each-box
1940-maximum-xor-for-each-query
2006-find-the-student-that-will-replace-the-chalk
2059-unique-length-3-palindromic-subsequences
2134-maximize-the-confusion-of-an-exam
2145-grid-game
2249-count-the-hidden-sequences
2334-number-of-flowers-in-full-bloom
2358-number-of-ways-to-split-array
2465-shifting-letters-ii
2488-divide-intervals-into-minimum-number-of-groups
2576-minimum-penalty-for-a-shop
2676-find-the-score-of-all-prefixes-of-an-array
2691-count-vowel-strings-in-ranges
3031-construct-product-matrix
3262-find-polygon-with-the-largest-perimeter
3271-count-the-number-of-houses-at-a-certain-distance-i
3311-ant-on-the-boundary
3383-taking-maximum-energy-from-the-mystic-dungeon
3427-special-array-ii
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3616-make-array-elements-equal-to-zero
3639-zero-array-transformation-i

Sliding Window

0003-longest-substring-without-repeating-characters
0209-minimum-size-subarray-sum
0219-contains-duplicate-ii
0239-sliding-window-maximum
0424-longest-repeating-character-replacement
0643-maximum-average-subarray-i
0892-shortest-subarray-with-sum-at-least-k
1037-minimum-number-of-k-consecutive-bit-flips
1046-max-consecutive-ones-iii
1430-find-the-k-beauty-of-a-number
1445-number-of-sub-arrays-of-size-k-and-average-greater-than-or-equal-to-threshold
1460-number-of-substrings-containing-all-three-characters
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1567-maximum-number-of-vowels-in-a-substring-of-given-length
1586-longest-subarray-of-1s-after-deleting-one-element
1755-defuse-the-bomb
1776-minimum-operations-to-reduce-x-to-zero
1813-maximum-erasure-value
2134-maximize-the-confusion-of-an-exam
2463-minimum-recolors-to-get-k-consecutive-black-blocks
2478-longest-nice-subarray
2552-maximum-sum-of-distinct-subarrays-with-length-k
2599-take-k-of-each-character-from-left-and-right
2626-count-the-number-of-good-subarrays
2856-count-complete-subarrays-in-an-array
2868-continuous-subarrays
3150-shortest-and-lexicographically-smallest-beautiful-string
3380-shortest-subarray-with-or-at-least-k-ii
3463-alternating-groups-i
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3483-alternating-groups-ii
3522-find-the-power-of-k-size-subarrays-i
3523-find-the-power-of-k-size-subarrays-ii

Monotonic Stack

0042-trapping-rain-water
0316-remove-duplicate-letters
0402-remove-k-digits
0496-next-greater-element-i
0739-daily-temperatures
0780-max-chunks-to-make-sorted
1002-maximum-width-ramp
1072-next-greater-node-in-linked-list
1679-shortest-subarray-to-be-removed-to-make-array-sorted
3181-find-building-where-alice-and-bob-can-meet

Depth-First Search

0079-word-search
0094-binary-tree-inorder-traversal
0098-validate-binary-search-tree
0099-recover-binary-search-tree
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0112-path-sum
0113-path-sum-ii
0114-flatten-binary-tree-to-linked-list
0116-populating-next-right-pointers-in-each-node
0117-populating-next-right-pointers-in-each-node-ii
0130-surrounded-regions
0133-clone-graph
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0200-number-of-islands
0207-course-schedule
0210-course-schedule-ii
0211-design-add-and-search-words-data-structure
0226-invert-binary-tree
0230-kth-smallest-element-in-a-bst
0235-lowest-common-ancestor-of-a-binary-search-tree
0236-lowest-common-ancestor-of-a-binary-tree
0257-binary-tree-paths
0386-lexicographical-numbers
0399-evaluate-division
0404-sum-of-left-leaves
0417-pacific-atlantic-water-flow
0419-battleships-in-a-board
0437-path-sum-iii
0449-serialize-and-deserialize-bst
0463-island-perimeter
0508-most-frequent-subtree-sum
0513-find-bottom-left-tree-value
0515-find-largest-value-in-each-tree-row
0529-minesweeper
0538-convert-bst-to-greater-tree
0543-diameter-of-binary-tree
0547-number-of-provinces
0606-construct-string-from-binary-tree
0623-add-one-row-to-tree
0652-find-duplicate-subtrees
0662-maximum-width-of-binary-tree
0671-second-minimum-node-in-a-binary-tree
0684-redundant-connection
0687-longest-univalue-path
0695-max-area-of-island
0733-flood-fill
0744-network-delay-time
0766-flatten-a-multilevel-doubly-linked-list
0774-maximum-depth-of-n-ary-tree
0775-n-ary-tree-preorder-traversal
0776-n-ary-tree-postorder-traversal
0794-swim-in-rising-water
0799-minimum-distance-between-bst-nodes
0801-is-graph-bipartite
0820-find-eventual-safe-states
0869-similar-string-groups
0871-keys-and-rooms
0922-possible-bipartition
0960-minimize-malware-spread
0971-shortest-bridge
0988-flip-equivalent-binary-trees
0999-regions-cut-by-slashes
1005-univalued-binary-tree
1029-vertical-order-traversal-of-a-binary-tree
1030-smallest-string-starting-from-leaf
1035-cousins-in-binary-tree
1073-number-of-enclaves
1079-sum-of-root-to-leaf-binary-numbers
1104-coloring-a-border
1106-escape-a-large-maze
1114-binary-search-tree-to-greater-sum-tree
1116-maximum-level-sum-of-a-binary-tree
1243-sum-of-nodes-with-even-valued-grandparent
1350-remove-sub-folders-from-the-filesystem
1387-find-elements-in-a-contaminated-binary-tree
1396-count-servers-that-communicate
1428-jump-game-iii
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1442-number-of-operations-to-make-network-connected
1465-maximum-product-of-splitted-binary-tree
1474-longest-zigzag-path-in-a-binary-tree
1492-time-needed-to-inform-all-employees
1493-frog-position-after-t-seconds
1544-count-good-nodes-in-binary-tree
1576-reorder-routes-to-make-all-paths-lead-to-the-city-zero
1643-number-of-nodes-in-the-sub-tree-with-the-same-label
1663-detect-cycles-in-2d-grid
1866-restore-the-array-from-adjacent-pairs
1905-count-sub-islands
2103-find-all-groups-of-farmland
2121-find-if-path-exists-in-graph
2175-count-nodes-with-the-highest-score
2201-valid-arrangement-of-pairs
2206-detonate-the-maximum-bombs
2246-maximum-employees-to-be-invited-to-a-meeting
2403-count-unreachable-pairs-of-nodes-in-an-undirected-graph
2416-evaluate-boolean-binary-tree
2438-find-closest-node-to-given-two-nodes
2445-reachable-nodes-with-restrictions
2461-amount-of-time-for-binary-tree-to-be-infected
2493-reverse-odd-levels-of-binary-tree
2545-height-of-binary-tree-after-subtree-removal-queries
2662-check-knight-tour-configuration
2677-cousins-in-binary-tree-ii
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components
3386-find-edges-in-shortest-paths
3439-find-minimum-diameter-after-merging-two-trees
3561-remove-methods-from-project

Simulation

0043-multiply-strings
0054-spiral-matrix
0059-spiral-matrix-ii
0068-text-justification
0258-add-digits
0289-game-of-life
0412-fizz-buzz
0415-add-strings
0498-diagonal-traverse
0657-robot-return-to-origin
0682-baseball-game
0735-asteroid-collision
0861-flipping-an-image
0898-transpose-matrix
0906-walking-robot-simulation
0983-validate-stack-sequences
1006-clumsy-factorial
1041-available-captures-for-rook
1119-robot-bounded-in-circle
1184-car-pooling
1252-cells-with-odd-values-in-a-matrix
1312-count-artifacts-that-can-be-extracted
1342-queens-that-can-attack-the-king
1400-find-winner-on-a-tic-tac-toe-game
1441-build-an-array-with-stack-operations
1449-print-words-vertically
1627-last-moment-before-all-ants-fall-out-of-a-plank
1642-water-bottles
1667-find-kth-bit-in-nth-binary-string
1706-where-will-the-ball-fall
1803-average-waiting-time
1951-find-the-winner-of-the-circular-game
2006-find-the-student-that-will-replace-the-chalk
2021-remove-all-occurrences-of-a-substring
2048-build-array-from-permutation
2058-concatenation-of-array
2076-sum-of-digits-of-string-after-convert
2132-convert-1d-array-into-2d-array
2169-simple-bank-system
2197-decode-the-slanted-ciphertext
2232-adding-spaces-to-a-string
2271-rearrange-array-elements-by-sign
2274-keep-multiplying-found-values-by-two
2278-find-three-consecutive-integers-that-sum-to-a-given-number
2317-count-collisions-on-a-road
2343-count-unguarded-cells-in-the-grid
2386-min-max-game
2428-equal-row-and-column-pairs
2470-removing-stars-from-a-string
2483-task-scheduler-ii
2551-apply-operations-to-an-array
2553-total-cost-to-hire-k-workers
2645-pass-the-pillow
2662-check-knight-tour-configuration
2695-find-score-of-an-array-after-marking-all-elements
2857-total-distance-traveled
3311-ant-on-the-boundary
3332-minimum-operations-to-exceed-threshold-value-ii
3336-water-bottles-ii
3433-count-mentions-per-user
3434-find-the-number-of-distinct-colors-among-the-balls
3447-clear-digits
3555-final-array-state-after-k-multiplication-operations-i
3616-make-array-elements-equal-to-zero

Game Theory

0292-nim-game
0909-stone-game
3462-vowels-game-in-a-string

Memoization

0070-climbing-stairs
1013-fibonacci-number
1236-n-th-tribonacci-number
3239-minimum-number-of-operations-to-make-x-and-y-equal

String Matching

0028-find-the-index-of-the-first-occurrence-in-a-string
0214-shortest-palindrome
0812-rotate-string
1508-longest-happy-prefix
1524-string-matching-in-an-array
1566-check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence
3309-count-prefix-and-suffix-pairs-i
3684-substring-matching-pattern

Merge Sort

0023-merge-k-sorted-lists
0148-sort-list
0948-sort-an-array
2280-count-good-triplets-in-an-array

Counting Sort

0948-sort-an-array
1137-height-checker
1365-how-many-numbers-are-smaller-than-the-current-number

Combinatorics

0062-unique-paths
1993-sum-of-all-subset-xor-totals
3199-distribute-candies-among-children-i

Design

0155-min-stack
0173-binary-search-tree-iterator
0208-implement-trie-prefix-tree
0211-design-add-and-search-words-data-structure
0225-implement-stack-using-queues
0232-implement-queue-using-stacks
0284-peeking-iterator
0295-find-median-from-data-stream
0304-range-sum-query-2d-immutable
0307-range-sum-query-mutable
0384-shuffle-an-array
0449-serialize-and-deserialize-bst
0535-encode-and-decode-tinyurl
0729-my-calendar-i
0789-kth-largest-element-in-a-stream
0817-design-hashmap
0860-design-circular-queue
0969-number-of-recent-calls
1023-time-based-key-value-store
1097-stream-of-characters
1387-find-elements-in-a-contaminated-binary-tree
1477-product-of-the-last-k-numbers
1512-design-underground-system
1582-design-browser-history
1767-design-front-middle-back-queue
1955-seat-reservation-manager
2023-design-movie-rental-system
2169-simple-bank-system
2413-smallest-number-in-infinite-set
2429-design-a-food-rating-system
2434-design-a-number-container-system
2512-longest-uploaded-prefix
3797-design-spreadsheet
3827-implement-router

Queue

0225-implement-stack-using-queues
0232-implement-queue-using-stacks
0239-sliding-window-maximum
0387-first-unique-character-in-a-string
0649-dota2-senate
0860-design-circular-queue
0892-shortest-subarray-with-sum-at-least-k
0969-number-of-recent-calls
1037-minimum-number-of-k-consecutive-bit-flips
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
1767-design-front-middle-back-queue
1951-find-the-winner-of-the-circular-game
2868-continuous-subarrays
3475-minimum-operations-to-make-binary-array-elements-equal-to-one-i
3827-implement-router

Union Find

0128-longest-consecutive-sequence
0130-surrounded-regions
0200-number-of-islands
0399-evaluate-division
0547-number-of-provinces
0684-redundant-connection
0695-max-area-of-island
0794-swim-in-rising-water
0801-is-graph-bipartite
0869-similar-string-groups
0922-possible-bipartition
0960-minimize-malware-spread
0999-regions-cut-by-slashes
1032-satisfiability-of-equality-equations
1058-lexicographically-smallest-equivalent-string
1073-number-of-enclaves
1396-count-servers-that-communicate
1442-number-of-operations-to-make-network-connected
1663-detect-cycles-in-2d-grid
1706-min-cost-to-connect-all-points
1905-count-sub-islands
2121-find-if-path-exists-in-graph
2198-process-restricted-friend-requests
2403-count-unreachable-pairs-of-nodes-in-an-undirected-graph
2445-reachable-nodes-with-restrictions
2512-longest-uploaded-prefix
2588-maximum-number-of-points-from-grid-queries
2764-maximum-number-of-fish-in-a-grid
2793-count-the-number-of-complete-components
3219-make-lexicographically-smallest-array-by-swapping-elements

Interactive

0278-first-bad-version
0374-guess-number-higher-or-lower

Segment Tree

0307-range-sum-query-mutable
0729-my-calendar-i
2280-count-good-triplets-in-an-array
2512-longest-uploaded-prefix
3181-find-building-where-alice-and-bob-can-meet

Ordered Set

0729-my-calendar-i
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
2023-design-movie-rental-system
2280-count-good-triplets-in-an-array
2334-number-of-flowers-in-full-bloom
2413-smallest-number-in-infinite-set
2429-design-a-food-rating-system
2434-design-a-number-container-system
2447-merge-similar-items
2512-longest-uploaded-prefix
2868-continuous-subarrays
3827-implement-router

Graph

0133-clone-graph
0207-course-schedule
0210-course-schedule-ii
0399-evaluate-division
0547-number-of-provinces
0684-redundant-connection
0744-network-delay-time
0801-is-graph-bipartite
0820-find-eventual-safe-states
0871-keys-and-rooms
0922-possible-bipartition
0960-minimize-malware-spread
1032-satisfiability-of-equality-equations
1039-find-the-town-judge
1325-path-with-maximum-probability
1424-maximum-candies-you-can-get-from-boxes
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
1442-number-of-operations-to-make-network-connected
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
1493-frog-position-after-t-seconds
1576-reorder-routes-to-make-all-paths-lead-to-the-city-zero
1661-minimum-number-of-vertices-to-reach-all-nodes
1706-min-cost-to-connect-all-points
1738-maximal-network-rank
1916-find-center-of-star-graph
2121-find-if-path-exists-in-graph
2198-process-restricted-friend-requests
2201-valid-arrangement-of-pairs
2206-detonate-the-maximum-bombs
2220-find-all-possible-recipes-from-given-supplies
2246-maximum-employees-to-be-invited-to-a-meeting
2375-minimum-obstacle-removal-to-reach-corner
2403-count-unreachable-pairs-of-nodes-in-an-undirected-graph
2438-find-closest-node-to-given-two-nodes
2445-reachable-nodes-with-restrictions
2590-maximum-star-sum-of-a-graph
2671-shortest-cycle-in-a-graph
2711-minimum-time-to-visit-a-cell-in-a-grid
2793-count-the-number-of-complete-components
3189-find-champion-ii
3235-minimum-cost-to-convert-string-i
3271-count-the-number-of-houses-at-a-certain-distance-i
3386-find-edges-in-shortest-paths
3439-find-minimum-diameter-after-merging-two-trees
3517-shortest-distance-after-road-addition-queries-i
3558-find-a-safe-walk-through-a-grid
3561-remove-methods-from-project
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Rejection Sampling

0915-generate-random-point-in-a-circle

Randomized

0382-linked-list-random-node
0384-shuffle-an-array
0398-random-pick-index
0915-generate-random-point-in-a-circle

Monotonic Queue

0239-sliding-window-maximum
0892-shortest-subarray-with-sum-at-least-k
1549-longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit
2868-continuous-subarrays

Shortest Path

0399-evaluate-division
0744-network-delay-time
1325-path-with-maximum-probability
1485-minimum-cost-to-make-at-least-one-valid-path-in-a-grid
2375-minimum-obstacle-removal-to-reach-corner
2711-minimum-time-to-visit-a-cell-in-a-grid
3235-minimum-cost-to-convert-string-i
3386-find-edges-in-shortest-paths
3558-find-a-safe-walk-through-a-grid
3627-find-minimum-time-to-reach-last-room-i
3628-find-minimum-time-to-reach-last-room-ii

Minimum Spanning Tree

1706-min-cost-to-connect-all-points

Data Stream

0295-find-median-from-data-stream
0789-kth-largest-element-in-a-stream
0969-number-of-recent-calls
1097-stream-of-characters
1477-product-of-the-last-k-numbers
1582-design-browser-history
1767-design-front-middle-back-queue

Topological Sort

0207-course-schedule
0210-course-schedule-ii
0820-find-eventual-safe-states
1431-all-ancestors-of-a-node-in-a-directed-acyclic-graph
2220-find-all-possible-recipes-from-given-supplies
2246-maximum-employees-to-be-invited-to-a-meeting

Eulerian Circuit

2201-valid-arrangement-of-pairs

Binary Indexed Tree

0307-range-sum-query-mutable
2280-count-good-triplets-in-an-array
2512-longest-uploaded-prefix
3181-find-building-where-alice-and-bob-can-meet

Reservoir Sampling

0382-linked-list-random-node
0398-random-pick-index

Hash Function

0214-shortest-palindrome
0535-encode-and-decode-tinyurl
0817-design-hashmap
1508-longest-happy-prefix
2339-k-divisible-elements-subarrays
3309-count-prefix-and-suffix-pairs-i

Concurrency

1187-print-foobar-alternately
1203-print-in-order
1216-print-zero-even-odd
1340-the-dining-philosophers

Rolling Hash

0214-shortest-palindrome
1508-longest-happy-prefix
2339-k-divisible-elements-subarrays
3309-count-prefix-and-suffix-pairs-i

Doubly-Linked List

0766-flatten-a-multilevel-doubly-linked-list
1582-design-browser-history

Iterator

0173-binary-search-tree-iterator
0284-peeking-iterator

Line Sweep

0391-perfect-rectangle