LeetCode Climbing Stairs

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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?

题意： 求上n个台阶的方法数，要么走一步，要么两步。

思路：递归超时，递推

class Solution {
public:
    int climbStairs(int n) {
        if (n <= 2) return n;

        int f[1000];
        f[1] = 1, f[2] = 2;
        for (int i = 3; i <= n; i++)
            f[i] = f[i-1] + f[i-2];

        return f[n];
    }
};

LeetCode Climbing Stairs

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原文地址：http://blog.csdn.net/u011345136/article/details/44854243