矩形覆盖

class Solution {
public:
    int rectCover(int number) {
        if(number <= 0) return 0;
        if(number == 1) return 1;
        if(number == 2) return 2;
        else if(number > 2)  
            return rectCover(number -1) +rectCover(number -2);

    }
};