Web Reference: Given the roots of two binary trees p and q, write a function to check if they are the same or not. Two binary trees are considered the same if they are structurally identical, and the nodes have the same value. Two binary trees are the same if: Their structure is identical. Their corresponding nodes have the same values. So at every position: If both nodes are null → they match. If one is null but the other isn't → mismatch. If both exist but values differ → mismatch. Otherwise, compare their left subtrees and right subtrees recursively. The key insight is that two trees are the same if and only if their roots match AND their corresponding subtrees match. This breaks down the problem into smaller subproblems of the same type - comparing smaller trees.
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