/in/foo.cc: In function 'void work(int*)':
/in/foo.cc:46:2: error: 'string' was not declared in this scope
  string s;cin>>s;l[0]=s.length();
  ^~~~~~
/in/foo.cc:46:11: error: 'cin' was not declared in this scope
  string s;cin>>s;l[0]=s.length();
           ^~~
/in/foo.cc:46:16: error: 's' was not declared in this scope
  string s;cin>>s;l[0]=s.length();
                ^