Compilare: main.cpp: In function 'bool bfs_HK()': main.cpp:23:29: warning: comparison of integer expressions of different signedness: 'long unsigned int' and 'int' [-Wsign-compare] 23 | for(unsigned long i=1; i<=m; ++i) | ~^~~ main.cpp: In function 'int main()': main.cpp:103:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | while(j<s.length()) | ~^~~~~~~~~~~ main.cpp:109:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 109 | while(j<s.length() && '0'<s[j] && s[j]<'9') | ~^~~~~~~~~~~