foo.cc: In function 'int fen(std::string&, char (*)[100001])':
foo.cc:10:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
10 | for(int i=0;i<a.length();i++)
| ~^~~~~~~~~~~
foo.cc:14:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
14 | for(int i=0;i<a.length();i++)
| ~^~~~~~~~~~~
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