Compilare: user.cpp: In function ‘void backtrack(int, const std::vector<int>&, int, std::vector<int>, int&)’: user.cpp:26:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < best_resturi.size(); ++i){ ^ user.cpp:29:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = moneda_cur+1; i < monezi.size(); ++i){ ^ user.cpp: In function ‘int main()’: user.cpp:42:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); ++i){ ^ user.cpp:48:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i+1; j < v.size(); ++j){ ^