/in/foo.cc: In function 'int main()':
/in/foo.cc:10:2: error: 'cin' was not declared in this scope
  cin>>L>>S>>T>>M;
  ^~~
/in/foo.cc:22:3: error: 'cout' was not declared in this scope
   cout<<cnt;
   ^~~~
/in/foo.cc:71:2: error: 'cout' was not declared in this scope
  cout<<min;
  ^~~~