Open Zheaoli opened 1 year ago
/*
* @lc app=leetcode id=112 lang=typescript
*
* [112] Path Sum
*/
// @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 hasPathSum(root: TreeNode | null, targetSum: number): boolean {
const walk = (node, prevVal = 0) => {
if (!node) return false;
const val = prevVal + node.val;
if (!node.left && !node.right && val === targetSum) return true;
return walk(node.left, val) || walk(node.right, val);
}
return walk(root);
};
// @lc code=end
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2022-10-19