Compilare: main.cpp: In static member function 'static void Problem4::solve(std::vector<int>&, std::vector<std::pair<int, int> >&)': main.cpp:40:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for (int i = 0; i < a.size(); i++) { | ~~^~~~~~~~~~ main.cpp: In static member function 'static int Subsecvente::check(std::vector<std::__cxx11::basic_string<char> >&, int)': main.cpp:77:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 77 | for (i = L; i < s[0].length(); i++) { | ~~^~~~~~~~~~~~~~~ main.cpp:87:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 87 | for (i = L; i < s[j].length(); i++) | ~~^~~~~~~~~~~~~~~