Compilare: main.cpp: In function 'int main()': main.cpp:23:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for(int i = 0; i < arr.size(); i++){ | ~~^~~~~~~~~~~~ main.cpp:25:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(int j = i + 1; j < arr.size(); j++){ | ~~^~~~~~~~~~~~ main.cpp:40:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for(int i = last + 1; i < arr.size(); i++){ | ~~^~~~~~~~~~~~