【leetcode】Climbing Stairs (easy)

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?

跳台阶，之前写过递归的，这次写个非递归的。

到第n层的方式其实就是到第n-1层的方式（爬一层）和到第n-2层的方式（爬两层）的和

class Solution {

public:

    int climbStairs(int n) {

        if(n <= ) return ;

        else if(n == ) return ;

        else if(n == ) return ;

        else

        {

            int way1 = ;

            int way2 = ;

            int ans = ;

            for(int i = ; i <= n; i++)

            {

                ans = way1 + way2;

                way2 = way1;

                way1 = ans;

            }

            return ans;

        }

    }

};

巴特西

【leetcode】Climbing Stairs (easy)

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