Compilare: main.cpp: In function 'void solve(int, int, std::vector<int>, std::ofstream&)': main.cpp:12:20: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 12 | if (res.size() == k) { | ~~~~~~~~~~~^~~~ main.cpp:13:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for(int i = 0; i < res.size(); i++) { | ~~^~~~~~~~~~~~