Compilare: main.cpp: In function 'short int pref(std::string, std::string)': main.cpp:41:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for(int i = 1; i < s.size(); i ++) | ~~^~~~~~~~~~ main.cpp: In function 'bool continut(std::string, std::string)': main.cpp:67:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | for(int i = 1; i < s.size(); i ++) | ~~^~~~~~~~~~ main.cpp:84:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 84 | for(int i = 0; i < s.size(); i ++) | ~~^~~~~~~~~~ main.cpp:86:18: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<short int>, short int>::value_type' {aka 'short int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 86 | if(pi[i] == a.size())