Compilare: main.cpp: In function 'void back(long long int, long long int, std::vector<long long int>&)': main.cpp:33:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k == fact.size()) { ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:74:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < divizori.size(); ++j) { ~~^~~~~~~~~~~~~~~~~ main.cpp:79:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < divizori.size(); ++j) { ~~^~~~~~~~~~~~~~~~~ main.cpp:92:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < divizori.size(); ++j) { ~~^~~~~~~~~~~~~~~~~ main.cpp:99:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < divizori.size(); ++j) { ~~^~~~~~~~~~~~~~~~~