Compilare: user.cpp: In function ‘int main()’: user.cpp:28:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (M + frunze.size() != K +1) ^ user.cpp:35:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < graph[b].size(); ++i) ^ user.cpp:16:22: warning: unused variable ‘x’ [-Wunused-variable] int i, a, b, vecin, x, y; ^ user.cpp:16:25: warning: unused variable ‘y’ [-Wunused-variable] int i, a, b, vecin, x, y; ^