Compilare: user.cpp: In function ‘int getColor(int)’: user.cpp:22:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < V[node].size(); i++) ^ user.cpp: In function ‘void DF(int)’: user.cpp:33:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < V[node].size(); i++) ^ user.cpp: In function ‘int getColor(int)’: user.cpp:28:1: warning: control reaches end of non-void function [-Wreturn-type] } ^