Compilare: user.cpp: In function ‘int main()’: user.cpp:30:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (M + frunze.size() != K +1) ^ user.cpp:37:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < graph[b].size(); ++i) ^ user.cpp:70:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < graph[a].size(); ++i) ^ user.cpp:18:22: warning: unused variable ‘x’ [-Wunused-variable] int i, a, b, vecin, x, y; ^ user.cpp:18:25: warning: unused variable ‘y’ [-Wunused-variable] int i, a, b, vecin, x, y; ^