Open Zheaoli opened 1 year ago
/*
* @lc app=leetcode id=108 lang=typescript
*
* [108] Convert Sorted Array to Binary Search Tree
*/
// @lc code=start
/**
* Definition for a binary tree node.
* class TreeNode {
* val: number
* left: TreeNode | null
* right: TreeNode | null
* constructor(val?: number, left?: TreeNode | null, right?: TreeNode | null) {
* this.val = (val===undefined ? 0 : val)
* this.left = (left===undefined ? null : left)
* this.right = (right===undefined ? null : right)
* }
* }
*/
function sortedArrayToBST(nums: number[]): TreeNode | null {
const helper = (l, r) => {
if (l > r) {
return null;
}
const m = ~~((l + r) / 2);
const node = new TreeNode(
nums[m],
helper(l, m - 1),
helper(m + 1, r)
);
return node;
}
return helper(0, nums.length - 1);
};
// @lc code=end
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2022-10-18