8 跳台阶

class Solution {
public:
    int jumpFloor(int number) {
        if(number == 0){
            return 1;
        }
        if(number == 1){
            return 1;
        }
        
        int a = 1;
        int b = 1;
        int c = 0;
        while((number--) > 1){
            c = a + b;
            a = b;
            b = c;
        }
        return c;
    }
};