Compilare: user.cpp: In function ‘void dfs1(int, int)’: user.cpp:23:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[x].size(); ++i) ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:48:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<G[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:81:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=2; j<cycle.size(); ++j) ^