Compilare: main.cpp: In function 'int compare(std::string&, std::string&)': main.cpp:28:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | if(lcs(a,b,a.size(),b.size())==b.size()) | ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:42:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 42 | if(s.size()>szmax) | ~~~~~~~~^~~~~~ main.cpp:49:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 49 | if(s.size()==szmax && s<ans) | ~~~~~~~~^~~~~~~