LeetCode Lowest Common Ancestor of a Binary Search Tree
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/** * Definition for a binary tree node. * struct TreeNode { * int val; * struct TreeNode *left; * struct TreeNode *right; * }; */struct TreeNode* lowestCommonAncestor(struct TreeNode* root, struct TreeNode* p, struct TreeNode* q) { if(root==NULL) return NULL; else if(root->val<p->val&&root->val<q->val) return lowestCommonAncestor(root->right,p,q); else if(root->val>p->val&&root->val>q->val) return lowestCommonAncestor(root->left,p,q); else return root;}这个题是找两节点最近祖先节点，开始理解成找最近最小祖先节点打算用数组记录。
后发现题目含义之后，改用递归方法。
C语言 2016/2/13
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