파이썬 알고리즘 인터뷰 87번(리트코드 70번) Climbing Stairs
https://leetcode.com/problems/climbing-stairs/
class Solution:
def climbStairs(self, n: int) -> int:
if n <= 2:
return n
a, b = 1, 2
for _ in range(n - 2):
a, b = b, a + b
return b