/in/foo.cc: In function 'long long int foo()':
/in/foo.cc:10:2: error: 'sync_with' is not a member of 'std::ios {aka std::basic_ios<char>}'
  ios::sync_with - stdio(0), cin.tie(0), cout.tie(0);
  ^~~
/in/foo.cc:10:26: error: 'stdio' was not declared in this scope
  ios::sync_with - stdio(0), cin.tie(0), cout.tie(0);
                          ^
/in/foo.cc:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < result.length(); i++)
                     ~~^~~~~~~~~~~~~~~~~