【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;
 }