foo.cc: In function 'void test102()':
foo.cc:36:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |    for (int i = 0; i < qw.size(); i++)
      |                    ~~^~~~~~~~~~~
foo.cc:38:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |     for (int j = 0; j < f.size(); j++)
      |                     ~~^~~~~~~~~~
foo.cc:49:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |    if (count == qw.size())
      |        ~~~~~~^~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务