Compilare: main.cpp: In function 'int longest_common_prefix(std::string, std::string)': main.cpp:15:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | while (index<word1.size()&&index<word2.size()) { | ~~~~~^~~~~~~~~~~~~ main.cpp:15:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | while (index<word1.size()&&index<word2.size()) { | ~~~~~^~~~~~~~~~~~~