剑指 Offer 68 - I. 二叉搜索树的最近公共祖先

/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
class Solution {
    public TreeNode lowestCommonAncestor(TreeNode root, TreeNode p, TreeNode q) {
        if(root==null){
            return root;
        }
        if(root.val>p.val&&root.val>q.val){
            return lowestCommonAncestor(root.left,p,q);
        }else if(root.val

 

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