【6_100】Same Tree

Same Tree

Total Accepted: 97481 Total Submissions: 230752 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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这次卡在了递归的return使用上，原来可以一次return两个啊

错误写法：

else if(p != NULL && q != NULL && p->val == q->val) {
　　isSameTree(p->left, q->left) ；

　　isSameTree(p->right, q->right)；
}

正确写法：

else if(p != NULL && q != NULL && p->val == q->val) {
　　return (isSameTree(p->left, q->left) && isSameTree(p->right, q->right));
}

这次是C语言

/**
 * 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 && p->val == q->val) {
            return (isSameTree(p->left, q->left) && isSameTree(p->right, q->right));
    }
    else
        return false;
}