leetcode - Convert Sorted Array to Binary Search Tree
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Given an array where elements are sorted in ascending order, convert it to a height balanced BST.
/** * Definition for binary tree * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */struct TreeNode{int val;TreeNode *left;TreeNode *right;TreeNode(int x) : val(x), left(NULL), right(NULL) {}};class Solution {public: TreeNode *sortedArrayToBST(std::vector<int> &num) { return ArrayToBST(num,0,num.size()-1); }private:TreeNode *ArrayToBST(std::vector<int> &num, int start, int end){if(start > end) return NULL;int mid = (start + end) / 2;TreeNode *root = new TreeNode(num[mid]);root->left = ArrayToBST(num,start,mid - 1);root->right = ArrayToBST(num,mid + 1, end);return root;}}; 0 0
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