矩形覆盖

# -*- coding:utf-8 -*-
class Solution:
    def rectCover(self, number):
        # write code here
        if number==0:
            return 0
        if number==1:
            return 1
        if number==2:
            return 2
        a=1
        b=2
        for i in range(3,number+1):
            c=a+b
            a=b
            b=c
        return c