LeetCode-Same Tree

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/** * 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) {        // Start typing your C/C++ solution below        // DO NOT write int main() function        if (p == NULL)        {            return q == NULL;        }        else if (q == NULL)        {            return false;        }        else        {            return p->val == q->val && isSameTree(p->left, q->left) && isSameTree(p->right, q->right);        }            }};