Compilare: user.cpp: In function ‘void MST(int)’: user.cpp:87:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[1].size(); ++i) ^ user.cpp:104:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[e].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:135:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < A[i].size(); ++j) ^