矩形覆盖

class Solution {
public:
    int rectCover(int number) {
		if(number <= 1)
			return number;
        if(number == 2)
            return 2;
		int res;
		int one = 1, two = 2;
        
		for(int i = 3; i <= number; i++)
		{
			res = one + two;
			one = two;
			two = res;
		}
		return res;
    }
};