[LeetCode] Convert Sorted Array to Binary Search Tree
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/** * 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 *build(vector<int> &num, int s, int t) { if (s > t) return NULL; int mid = (s + t) / 2; TreeNode *parent = new TreeNode(num[mid]); parent->left = build(num, s, mid - 1); parent->right = build(num, mid + 1, t); return parent; } TreeNode *sortedArrayToBST(vector<int> &num) { // Start typing your C/C++ solution below // DO NOT write int main() function return build(num, 0, num.size() - 1); }};Small Case: 0ms
Large Case: 92ms
Time: O(n)
Space: O(1)
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