Compilare: user.cpp: In function ‘void bfs(int)’: user.cpp:61:11: warning: variable ‘fk’ set but not used [-Wunused-but-set-variable] int k,fk; ^ user.cpp: In function ‘int main()’: user.cpp:84:11: warning: variable ‘sm’ set but not used [-Wunused-but-set-variable] int i,sm; ^ user.cpp: In function ‘void read()’: user.cpp:20:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.in","r",stdin); ^ user.cpp:21:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("graf.out","w",stdout); ^ user.cpp:23:37: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&n,&m,&x,&y); ^ user.cpp:28:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x1,&y1); ^