1 /* 2     题意：一个n×m的矩形，相邻的颜色不同，黑或白。问最少的翻转次数，每次翻转可指定任意一个子矩形 3     思维题：最少要把偶数行和列翻转，也就是n/2+m/2次 4 */ 5 #include 
     
       6 using namespace std; 7  8 int main(void)        //Gym 100553A Alter Board 9 {10 //    freopen ("A.in", "r", stdin);11     freopen ("alter.in", "r", stdin);12     freopen ("alter.out", "w", stdout);13 14     int n, m;15     while (scanf ("%d%d", &n, &m) == 2)16     {17         printf ("%d\n", n / 2 + m / 2);18         for (int i=2; i<=n; i+=2)19         {20             printf ("%d %d %d %d\n", i, 1, i, m);21         }22         for (int i=2; i<=m; i+=2)23         {24             printf ("%d %d %d %d\n", 1, i, n, i);25         }26     }27 28     return 0;29 }