[Leetcode]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.

 

同样是树的问题，直接递归解，就可以了。

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