LeetCode 100. Same Tree
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/** * 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; else if((p==NULL && q!=NULL)||(p!=NULL&&q==NULL)) return false; else if(p->val!=q->val) return false; else if(isSameTree(p->left, q->left)&&isSameTree(p->right, q->right)) return true; else return false; }};At first, i lost the second judge statement: else if((p==NULL && q!=NULL)||(p!=NULL&&q==NULL)) return false;, the result shows runtime error. So must include all posibilities!
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