Compilare: user.cpp: In function ‘void dfs()’: user.cpp:24:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k,nod,vf=0,x; ^ user.cpp:24:13: warning: unused variable ‘k’ [-Wunused-variable] int i,j,k,nod,vf=0,x; ^ user.cpp:24:15: warning: unused variable ‘nod’ [-Wunused-variable] int i,j,k,nod,vf=0,x; ^ user.cpp: In function ‘void read()’: user.cpp:13:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.in","r",stdin); ^ user.cpp:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:16:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] {scanf("%d%d",&x,&y); ^ user.cpp: In function ‘void dfs()’: user.cpp:26:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sortaret.out","w",stdout); ^