Compilare: main.cpp: In function 'int longPre(std::string&)': main.cpp:21:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | while (pref < word.size() && pref < s.size() && word[pref] == s[pref]) | ~~~~~^~~~~~~~~~~~~ main.cpp:21:43: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | while (pref < word.size() && pref < s.size() && word[pref] == s[pref]) | ~~~~~^~~~~~~~~~