// Initialize two pointers, 'i' and 'j', pointing to the start and end of the string. int i = 0; int j = s.length() - 1; // Loop until the two pointers meet or cross each other. while (i < j) { // Get ...

DFS (Depth-First Search) and BFS (Breadth-First Search) are two of the most important graph and tree traversal algorithms used in coding interviews, competitive programming, and real-world software ...

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Each linked list represents a number where the most significant digit comes first, and the goal is to return their sum as a new linked list in the same order. 💡 Approach: Since we can’t traverse ...