Compilare: user.cpp: In function ‘int main()’: user.cpp:25:52: warning: unused variable ‘rtup’ [-Wunused-variable] int n,x,y,k1=0,k2=0,ans=0,i,answer,bit,start=0,rtup,rt; ^ user.cpp:25:57: warning: unused variable ‘rt’ [-Wunused-variable] int n,x,y,k1=0,k2=0,ans=0,i,answer,bit,start=0,rtup,rt; ^ user.cpp:23:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pachete.in","r",stdin); ^ user.cpp:24:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pachete.out","w",stdout); ^ user.cpp:26:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&x,&y); ^ user.cpp:28:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].x,&v[i].y); ^