100. Same Tree（C++）

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.

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题目大意：

判断两颗二叉树是否相等。

解题方法：

对比每一个节点是否相同。

注意事项：

节点相同的条件：值相等，左右孩子相同。

C++代码：

 /**
  * 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==nullptr&&q==nullptr) return true;
         else if(p==nullptr||q==nullptr) return false;
         else return (p->val==q->val)&&isSameTree(p->right,q->right)&&isSameTree(p->left,q->left);

     }
 };