class Solution {
public:
    int rectCover(int number) {
        if(number == 0) return 0;
        if(number == 1) return 1;
        if(number == 2) return 2;
        int fNum = 1;
        int sNum = 2;
        int temp = 0;
        for(int i = 3; i <= number; ++i){
            temp = sNum;
            sNum = fNum + sNum;
            fNum = temp;
        }
        return sNum;
    }
};

public class Solution {
    public int RectCover(int target) {
        if(target == 0) return 0;
        if(target == 1) return 1;
        if(target == 2) return 2;
        int fNum = 1;
        int sNum = 2;
        int temp = 0;
        for(int i = 3; i <= target; ++i){
            temp = sNum;
            sNum = fNum + sNum;
            fNum = temp;
        }
        return sNum;
    }
}