foo.cc: In function 'int main()':
foo.cc:38:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   38 |     scanf("%d%d%d",&n,&m,&t);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:39:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |     for (int i=1;i<=m;i++) scanf("%lf%lf",&x2[i],&y2[i]);
      |                            ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:40:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   40 |     for (int i=1;i<=n;i++) scanf("%lf%lf%lf",&x1[i],&y1[i],&v[i]);
      |                            ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务