Compilare: user.cpp: In function ‘int main()’: user.cpp:40:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mosia.in","r",stdin); ^ user.cpp:41:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mosia.out","w",stdout); ^ user.cpp:43:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:44:69: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=n;i++) scanf("%lf%lf%lf",&v[i].x,&v[i].y,&v[i].d); ^ user.cpp:57:16: warning: ‘poz’ may be used uninitialized in this function [-Wmaybe-uninitialized] sort(v+poz+1,v+n+1,cmp2); ^ user.cpp:52:48: warning: ‘ymx’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(v[i].x>xmx or (v[i].x==xmx && v[i].y>ymx)) ^