Created
June 16, 2017 04:39
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| def common_anc(root, p, q) | |
| return root if (root.nil? || p == root.val || q == root.val) | |
| left = common_anc(root.left, p, q) | |
| right = common_anc(root.right, p, q) | |
| left && right ? root : left || right | |
| end | |
| common_anc(head, 4, 5) |
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