C++简单代码/4行/斐波那契数列：

class Solution {
public:
    int rectCover(int number) {
        int res = 1, res_first = 1;
        for (int i = 2; i <= number; i ++)
            res += res_first, res_first = res - res_first;
        return (number == 0) ? 0 : res;
    }
};