Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:13:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();++i) ^ user.cpp: In function ‘void dfscolor(int, int, int)’: user.cpp:24:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:30:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^