Add Run Length Encoding and Decoding [#2719]

strings/run_length_encoding.cpp

@@ -0,0 +1,43 @@
+#include <iostream>
+#include <string>
+using namespace std;
+
+// Run Length Encoding
+string encode(const string& input) {
+    string encoded = "";
+    int n = input.length();
+    for (int i = 0; i < n; i++) {
+        int count = 1;
+        while (i < n - 1 && input[i] == input[i + 1]) {
+            count++;
+            i++;
+        }
+        encoded += input[i] + to_string(count);
+    }
+    return encoded;
+}
+
+// Run Length Decoding
+string decode(const string& input) {
+    string decoded = "";
+    int n = input.length();
+    for (int i = 0; i < n; i += 2) {
+        char ch = input[i];
+        int count = input[i + 1] - '0';
+        decoded += string(count, ch);
+    }
+    return decoded;
+}
+
+// Driver code
+int main() {
+    string original = "aaabbcdddd";
+    string encoded = encode(original);
+    string decoded = decode(encoded);
+
+    cout << "Original: " << original << endl;
+    cout << "Encoded: " << encoded << endl;
+    cout << "Decoded: " << decoded << endl;
+
+    return 0;
+}