Flipkart Grid

Find the longest subarray of a given array where the sum of its elements is divisible by an integer k. A multi-source Breadth-First Search (BFS) problem, similar to LeetCode's "Rotting Oranges," but presented with a different narrative context. Find the Lowest Common Ancestor (LCA) of two employees in an organizational hierarchy. This can be solved using either a brute-force approach or binary lifting.