Compilare: user.cpp: In function ‘void Read()’: user.cpp:28:9: warning: unused variable ‘dx’ [-Wunused-variable] int dx[]={-1,0}; ^ user.cpp:29:9: warning: unused variable ‘dy’ [-Wunused-variable] int dy[]={0,-1}; ^ user.cpp: In function ‘void Solve()’: user.cpp:79:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[nod].size();i++) ^ user.cpp: In function ‘void Print()’: user.cpp:100:9: warning: unused variable ‘i’ [-Wunused-variable] int i; ^