#70. Climbing Stairs
https://leetcode.com/problems/climbing-stairs/description/?envType=daily-question&envId=2024-01-18
var climbStairs = function (n) {
if (n === 1) return 1
if (n === 2) return 2
let first = 1, second = 2
for (let i = 3; i <= n; i++)...
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