Compilare: user.cpp: In function ‘void BFS(int)’: user.cpp:30:9: warning: unused variable ‘st’ [-Wunused-variable] int st,dr,i,x,y,p=0,u=-1; ^ user.cpp:30:12: warning: unused variable ‘dr’ [-Wunused-variable] int st,dr,i,x,y,p=0,u=-1; ^ user.cpp:30:15: warning: unused variable ‘i’ [-Wunused-variable] int st,dr,i,x,y,p=0,u=-1; ^ user.cpp: In function ‘int main()’: user.cpp:59:9: warning: unused variable ‘i’ [-Wunused-variable] int i,b; ^ user.cpp:59:11: warning: unused variable ‘b’ [-Wunused-variable] int i,b; ^