View Compilation Error

0_0_35143883_2505.cpp: In function 'int main()':
0_0_35143883_2505.cpp:95:31: error: 'scanf_s' was not declared in this scope
  while (scanf_s("%d%d", &n, &m) != EOF) {
                               ^
0_0_35143883_2505.cpp:97:4: error: 'cin' was not declared in this scope
    cin >> graph[i];
    ^
0_0_35143883_2505.cpp:113:3: error: 'cout' was not declared in this scope
   cout << res << endl;
   ^
0_0_35143883_2505.cpp:113:18: error: 'endl' was not declared in this scope
   cout << res << endl;
                  ^