View Compilation Error

0_0_36049047_3894.cpp: In function 'int main()':
0_0_36049047_3894.cpp:14:30: error: 'scanf' was not declared in this scope
  while (scanf("%d %d", &n, &m) != EOF)
                              ^
0_0_36049047_3894.cpp:14:35: error: 'EOF' was not declared in this scope
  while (scanf("%d %d", &n, &m) != EOF)
                                   ^
0_0_36049047_3894.cpp:18:21: error: 'sort' was not declared in this scope
   sort(a, a + n, cmp);
                     ^
0_0_36049047_3894.cpp:21:21: error: 'printf' was not declared in this scope
    printf("%d", a[i]);
                     ^
0_0_36049047_3894.cpp:24:14: error: 'printf' was not declared in this scope
   printf("\n");
              ^