Compilare: main.cpp: In function 'bool solve(const std::vector<int>&, int, int, int)': main.cpp:15:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | if(index>=numbers.size() || sum>target_sum || chosen_numbers.size()==6){ | ~~~~~^~~~~~~~~~~~~~~~ main.cpp:19:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for (int i=index;i<numbers.size();i++){ | ~^~~~~~~~~~~~~~~