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LeetCode-- Unique Binary Search Trees II
递归
1 /** 2 * Definition for binary tree 3 * struct TreeNode { 4 * int val; 5 * TreeNode *left; 6 * TreeNode *right; 7 * TreeNode(int x) : val(x), left(NULL), right(NULL) {} 8 * }; 9 */10 class Solution {11 public:12 vector<TreeNode *> generateTrees(int n) {13 return dfs(1,n);14 }15 vector<TreeNode *> dfs(int l,int r)16 {17 vector<TreeNode *> res;18 if(l > r)19 {20 res.push_back(NULL);21 return res;22 }23 vector<TreeNode *> left;24 vector<TreeNode *> right;25 for(int cur = l ; cur <= r ; ++cur)26 {27 left = dfs(l,cur-1);28 right = dfs(cur+1,r);29 for(int i = 0 ; i < left.size() ; ++i)30 {31 for(int j = 0 ; j < right.size() ; ++j)32 {33 TreeNode *root = new TreeNode(cur);34 root->left = left[i];35 root->right = right[j];36 res.push_back(root);37 }38 }39 }40 return res;41 }42 };
LeetCode-- Unique Binary Search Trees II
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