Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:23:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0; k<edges[vf2].size(); ++k){ ^ user.cpp: In function ‘int main()’: user.cpp:54:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<edges[i].size(); ++j){ ^ user.cpp:66:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<edges[i].size(); ++j){ ^