foo.cc: In function 'void init()':
foo.cc:29:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   29 |     scanf("%d",&N);
      |     ~~~~~^~~~~~~~~
foo.cc:30:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |     for (int i=1;i<=N;i++) scanf("%lf %lf %lf",&A[i].x,&A[i].y,&po[i]);
      |                            ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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