View Compilation Error

0_0_39753328_11908.cpp: In function 'int main()':
0_0_39753328_11908.cpp:4:16: error: 'cin' was not declared in this scope
    4 |         while (cin >> m >> n) {
      |                ^~~
0_0_39753328_11908.cpp:14:41: error: 'abs' was not declared in this scope
   14 |                                 int x = abs(a[i][j]);
      |                                         ^~~
0_0_39753328_11908.cpp:23:17: error: 'cout' was not declared in this scope
   23 |                 cout << (r + 1) << ' ' << (c + 1) << ' ' << a[r][c] << endl;
      |                 ^~~~
0_0_39753328_11908.cpp:23:72: error: 'endl' was not declared in this scope
   23 |                 cout << (r + 1) << ' ' << (c + 1) << ' ' << a[r][c] << endl;
      |                                                                        ^~~~