Same Tree 深度优先

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.

 

Hide Tags

 Tree Depth-first Search

 

/**
 * Definition for binary tree
 * struct TreeNode {
 *     int val;
 *     TreeNode *left;
 *     TreeNode *right;
 *     TreeNode(int x) : val(x), left(NULL), right(NULL) {}
 * };
 */
class Solution {
public:
    bool isSameTree(TreeNode *p, TreeNode *q) {
        if(q==NULL && p==NULL)
            return true;
        if(q==NULL || p==NULL)
            return false;
        return p->val==q->val && isSameTree(p->left,q->left) && isSameTree(p->right,q->right);
    }
};