Leetcode 100. 相同的树解题报告

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/**
 * Definition for a binary tree node.
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */
class Solution {
public:
    bool isSameTree(TreeNode* p, TreeNode* q) 
    {
    
        if (p == NULL && q == NULL) return true;
        if (p == NULL || q == NULL) return false;
        if (p->val!=q->val) return false;     
        return isSameTree(p->left, q->left) && isSameTree(p->right, q->right);
    }
};