70.Climbing Stairs
class Solution {
public:int climbStairs(int n) {if (n == 1)return 1;int first = 1;int second = 2;for(int i = 3; i < n+1; i++){int third = first + second;first = second;second = third;}return second;}
};转载于:https://www.cnblogs.com/smallredness/p/10675639.html
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