LeetCode 100. 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.

DFS题

class Solution {
public:
bool isSameTree(TreeNode* p, TreeNode* q) {
if(!p && !q) return true;
if(p && !q || !p && q) return false;
if(isSameTree(p->left, q->left) && isSameTree(p->right, q->right) && p->val == q->val) return true;
else return false;

}
};