Compilare: main.cpp: In function 'void combinari(int, int, long long unsigned int, int, int)': main.cpp:26:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (product > a) return; ~~~~~~~~^~~ main.cpp: In function 'int main()': main.cpp:46:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[i] <= a) s += a / v[i];