Compilare: user.cpp: In function ‘int main()’: user.cpp:61:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i <= N; ++i) ^ user.cpp:72:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < comp.size(); ++i) ^ user.cpp:80:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i <= N; ++i) ^ user.cpp: In function ‘void DFS(int)’: user.cpp:94:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < G[nod].size();++j) ^