2018-母牛的故事

 1 #include<iostream>
 2 using namespace std;
 3 
 4 int main()
 5 {
 6     static int a[55];
 7     a[1] = 1;a[2] = 2;a[3] = 3;a[4] = 4;
 8     for (int i = 5;i < 55;i++)
 9         a[i] = a[i - 1] + a[i - 3];
10     int s;
11     while ((cin >> s) && (s != 0))
12         cout << a[s] << endl;
13     system("pause");
14     return 0;    
15 }