LeetCide--Same Tree

Given two binary trees, write a function to check if they are equal or not.

Two binary trees are considered equal if they are structurally identical and the nodes have the same value.

/**
 * Definition for binary tree
 * 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(q==NULL || p == NULL)
            return false;
        if(p->val != q->val)
            return false;
        bool left = isSameTree(p->left,q->left);
        bool right = isSameTree(p->right,q->right);
        return left&&right;
    }
};

LeetCide--Same Tree

原文：http://blog.csdn.net/shaya118/article/details/42705393