foo.cc: In function 'int main()':
foo.cc:77:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   77 |             scanf("%d%d%d",&e_x[i],&e_y[i],&e_v[i]);
      |             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:80:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   80 |         scanf("%d",&m);
      |         ~~~~~^~~~~~~~~
foo.cc:85:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   85 |             scanf("%d",&a[i]);
      |             ~~~~~^~~~~~~~~~~~

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