Compilare: main.cpp: In function 'void backtrack(const std::vector<int>&, std::vector<int>&, int, int, int)': main.cpp:24:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | if (index >= numbers.size() || current_sum > target_sum) | ~~~~~~^~~~~~~~~~~~~~~~~ main.cpp:29:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | for (int i = index; i < numbers.size(); i++) | ~~^~~~~~~~~~~~~~~~