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.
又是二叉树。。。二叉树。。。
目测。。。就是随便遍历一下。。然后看看等不等。。。
/**
* Definition for a binary tree node.
* 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(p == NULL && q == NULL)
return true;
if(p == NULL || q == NULL)
return false;
if(p->val != q->val)
return false;
else
return isSameTree(p->left,q->left) && isSameTree(p->right,q->right);
}
};
that’s it