Compilare: user.cpp: In function ‘std::vector<int> Solve(std::tuple<std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, std::vector<std::tuple<int, int, int, int>, std::allocator<std::tuple<int, int, int, int> > > >)’: user.cpp:80:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < queries.size(); i += 1) { ^ user.cpp:105:13: warning: unused variable ‘last’ [-Wunused-variable] int last = current^1; ^