View Compilation Error

0_0_26915491_20025.cpp: In function 'int main()':
0_0_26915491_20025.cpp:26:9: error: 'cin' was not declared in this scope
  while (cin >> M >> N && (M != 0 || N != 0))
         ^
0_0_26915491_20025.cpp:26:16: error: 'M' was not declared in this scope
  while (cin >> M >> N && (M != 0 || N != 0))
                ^
0_0_26915491_20025.cpp:26:21: error: 'N' was not declared in this scope
  while (cin >> M >> N && (M != 0 || N != 0))
                     ^
0_0_26915491_20025.cpp:45:3: error: 'cout' was not declared in this scope
   cout << cnt << endl;
   ^
0_0_26915491_20025.cpp:45:18: error: 'endl' was not declared in this scope
   cout << cnt << endl;
                  ^