101. Symmetric 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: deque<TreeNode *> de; bool isSymmetric(TreeNode* root) { //de = medium(root , de ); if(root == NULL){ return true; } return theSameNode(root->left,root->right); } bool theSameNode(TreeNode * le , TreeNode * ri){ if(!le && !ri){ return true; } if(!le || !ri){ return false; } if(le->val == ri->val){ return theSameNode(le->left,ri->right)&&theSameNode(ri->left,le->right); } else{ return false; } }};//递归法
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