Compilare: main.cpp: In function 'std::vector<int> matches(std::string, int)': main.cpp:9:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 9 | for (int i = 1; i < s.size (); i++) { | ~~^~~~~~~~~~~