Compilare: main.cpp: In function 'void BFS(int)': main.cpp:22:13: warning: variable 'ok' set but not used [-Wunused-but-set-variable] int ok=0; ^~ main.cpp:11:17: warning: unused variable 'nivel' [-Wunused-variable] int p=1,u=1,nivel=1; ^~~~~ main.cpp: In function 'int main()': main.cpp:54:11: warning: unused variable 'm' [-Wunused-variable] int n,m,x,a,b; ^ main.cpp:54:13: warning: unused variable 'x' [-Wunused-variable] int n,m,x,a,b; ^