牛客-跳臺階

牛客-跳臺階

#include <stdio.h>
#include <queue>
#include <stack>
#include <math.h>
#include <map>
#include <string.h>
#include <string>
#include <cstring>
#include <set>
#include <algorithm>
#include <vector>
using namespace std;


class Solution {
public:
    int jumpFloor(int number) {
        if (number==0 || number==1) {
            return 1;
        }
        int last1 = 1;
        int last2 = 1;
        int ans = 0;
        for (int i=2; i<=number; i++) {
            ans = last1+last2;
            last1 = last2;
            last2 = ans;
        }

        return ans;
    }
};