矩形覆盖

 1 class Solution {
 2 public:
 3     int rectCover(int number) {
 4           if (number == 1)
 5             return 1;
 6         if (number == 2)
 7             return 2;
 8         
 9         int fir = 1,sec = 2,result;
10         for (int i = 3; i <= number ; i++)
11             {
12                 result = fir + sec;
13                 fir = sec;
14                 sec = result; 
15             }
16         return result;
17     }
18 };