leetcode[70]Climbing Stairs
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?
class Solution { public: int climbStairs(int n) { if(n<=2)return n; int *s=new int[n]; s[0]=1; s[1]=2; for(int i=2;i<n;i++) { s[i]=s[i-1]+s[i-2]; } return s[n-1]; } };