LeetCode之100. Same Tree

------------------------------------------

递归比较即可

AC代码：

/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
public class Solution {
    public boolean isSameTree(TreeNode p, TreeNode q) {
        if(p==null && q==null) return true;
        else if((p==null && q!=null) || (p!=null && q==null) || (p!=null && q!=null && p.val!=q.val)) return false;
        else return isSameTree(p.left,q.left) && isSameTree(p.right,q.right);
    }
}

题目来源： https://leetcode.com/problems/same-tree/