leetcode_226_Invert Binary Tree(C++)(easy)
2016-04-18 11:44
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Invert a binary tree.
to
4 / \ 2 7 / \ / \ 1 3 6 9
to
4 / \ 7 2 / \ / \ 9 6 3 1
思路一:利用递归的思想
/** * 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: TreeNode* invertTree(TreeNode* root) { if(root == NULL) return root; TreeNode* tmp; tmp = root -> left; root -> left = root -> right; root -> right = tmp; invertTree(root -> left); invertTree(root -> right); return root; } };
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