You are climbing a stair case. It takes n steps to reach to the top.
Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?
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Sloving method：
class Solution(object): def climbStairs(self, n): pre = 0 cur = 1 #f(n) = f(n-1) + f(n-2) for i in range(0,n): sum = pre + cur pre = cur cur = sum return sum