10 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;
        }
        int a = 1,b = 2,c = 0;
        while((number--) > 2){
            c = a + b;
            a = b;
            b = c;
        }
        return c;
    }
};