In file included from /usr/include/c++/12/string:53,
                 from /usr/include/c++/12/bits/locale_classes.h:40,
                 from /usr/include/c++/12/bits/ios_base.h:41,
                 from /usr/include/c++/12/ios:42,
                 from /usr/include/c++/12/istream:38,
                 from /usr/include/c++/12/sstream:38,
                 from /usr/include/c++/12/complex:45,
                 from /usr/include/c++/12/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/12/bits/stdc++.h:54,
                 from /in/foo.cc:1:
In member function 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::pointer std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_M_data() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]',
    inlined from 'const _CharT* std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::data() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]' at /usr/include/c++/12/bits/basic_string.h:2568:23,
    inlined from 'std::basic_ostream<_CharT, _Traits>& std::operator<<(basic_ostream<_CharT, _Traits>&, const __cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = char_traits<char>; _Alloc = allocator<char>]' at /usr/include/c++/12/bits/basic_string.h:3888:30,
    inlined from 'int main()' at /in/foo.cc:43:19:
/usr/include/c++/12/bits/basic_string.h:234:28: warning: 'maxc' may be used uninitialized [-Wmaybe-uninitialized]
  234 |       { return _M_dataplus._M_p; }
      |                            ^~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:20:23: note: 'maxc' was declared here
   20 |     int t,h=0,maxn=-1,maxc;
      |                       ^~~~