Compilare: user.cpp: In function ‘int main()’: user.cpp:26:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (j < v.size()) ^ user.cpp:28:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((v[j] * 10 + 2) % p == n) ^ user.cpp:39:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((v[j] * 10 + 3) % p == n) ^ user.cpp:50:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((v[j] * 10 + 5) % p == n) ^ user.cpp:61:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if ((v[j] * 10 + 7) % p == n) ^ user.cpp:73:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j == v.size()) ^