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LeetCode 1644. Lowest Common Ancestor of a Binary Tree II
原题链接在这里：https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree-ii/ 题目： Given the root of a binary tree, return the lowest common ancestor (LCA) of two given nodes, p and q. If either node p or q does not exist in the tree, ret1644. Lowest Common Ancestor of a Binary Tree II
When we get this problem, we need to confirm the following 2 questions: 1. Can root, p or q be null? (No) 2. Are both p and q in the tree (No, either p or q mignt not in the tree), this is the only difference with 236. Lowest Common Ancestor of a Binary T