CF1266C Diverse Matrix

思路：
构造题。

实现：

 #include <bits/stdc++.h>
 using namespace std;
 int a[][];
 int main()
 {
     int r, c;
     while (cin >> r >> c)
     {
         if (c == )
         {
             if (r == ) cout <<  << endl;
             else
             {
                 for (int i = ; i <= r; i++)
                 {
                     cout << i +  << endl;
                 }
             }
             continue;
         }
         for (int i = ; i <= r; i++)
         {
             for (int j = ; j <= c; j++)
             {
                 a[i][j] = i * (j + r);
                 cout << a[i][j] << " ";
             }
             cout << endl;
         }
     }
     return ;
 }