100 Same Tree

链接：https://leetcode.com/problems/same-tree/
问题描述：
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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判断两棵树是否完全相同，只要每个节点拿出来比对就可以。

class Solution {
public:
    bool isSameTree(TreeNode* p, TreeNode* q) {
        return misSameTree(p,q);
    }
    bool misSameTree(TreeNode* n1,TreeNode* n2)
    {
        if(n1==NULL&&n2==NULL)return true;
        else if(n1==NULL||n2==NULL) return false;
        else if(n1->val!=n2->val)return false;
        else return misSameTree(n1->left,n2->left)&&misSameTree(n1->right,n2->right);
    }
};