🔹 Kth Smallest Element in a BST – Solved using Inorder Traversal + Min Heap approach. 🔹 Number of Islands – Classic Graph BFS/DFS problem ... Mock interviews and Leetcode contests ...

dfs(start, a, adj, pa, visited); // Recursively visit the neighbor. // Main function to get the ancestors of each node in the graph. auto it = pa[i].begin(); // Get the first element in the set of ...

Graph Representation: Represent the graph using an adjacency list for efficient traversal. Depth First Search (DFS): Perform a DFS traversal to check the connectivity between nodes c and d after ...