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.
Solution:
Code:
<span style="font-size:14px;">/** * Definition for binary tree * struct TreeNode { * int val; * TreeNode *left; * TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * }; */class Solution {public: TreeNode *helper(const vector<int> &num, int begin, int end) { if (begin > end) return NULL; int mid = (begin+end)/2; TreeNode *root = new TreeNode(num[mid]); root->left = helper(num, begin, mid-1); root->right = helper(num, mid+1, end); return root; } TreeNode *sortedArrayToBST(vector<int> &num) { return helper(num, 0, num.size()-1); }};</span> 0 0
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