Compilare: user.cpp: In function ‘int main()’: user.cpp:24:8: warning: unused variable ‘f’ [-Wunused-variable] FILE *f=freopen("bfs.in","r",stdin),*g=freopen("bfs.out","w",stdout); ^ user.cpp:24:39: warning: unused variable ‘g’ [-Wunused-variable] FILE *f=freopen("bfs.in","r",stdin),*g=freopen("bfs.out","w",stdout); ^ user.cpp:26:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&N,&M,&S); ^ user.cpp:29:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&i,&j); ^