leetcode 100--Same Tree

Same Tree

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Question  Solution 

Total Accepted: 84900  Total Submissions: 203205  Difficulty: Easy

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.

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 判断所给定的两个二叉树判断是否相等

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