/in/foo.cc: In function 'int main()':
/in/foo.cc:40:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d%d",&n,&m,&v,&e);
                               ^
/in/foo.cc:42:42: 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("%d",&C[i]);
                                          ^
/in/foo.cc:43:42: 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("%d",&D[i]);
                                          ^
/in/foo.cc:44:43: 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",&K[i]);
                                           ^
/in/foo.cc:47:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int x,y,v;scanf("%d%d%d",&x,&y,&v);
                                     ^