<ul><li>The problem involves finding the lowest common ancestor (LCA) of the deepest leaves in a binary tree.</li><li>Post-order traversal is used to efficiently compute the LCA in O(n) time complexity.</li><li>The approach computes the maximum depth of left and right subtrees for each node.</li><li>If both subtrees have the same depth, the current node becomes the LCA for its subtree.</li><li>The solution determines the LCA without explicitly collecting all deepest leaves.</li><li>The space complexity is O(h), where h is the height of the tree.</li><li>The function dfs performs post-order traversal, processing children before parent nodes.</li><li>Depth calculation is done for each node, and the depth is returned along with the LCA for leaf nodes.</li><li>Result extraction gives the LCA of the deepest leaves in the entire binary tree.</li><li>The approach is implemented using PHP and involves test cases to verify the solution.</li></ul>

1123. Lowest Common Ancestor of Deepest Leaves

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