foo.cc: In function 'int main()':
foo.cc:78:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   78 |     scanf("%lld%lld",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~~~~~
foo.cc:82:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   82 |         scanf("%lld",&a1[i].a);
      |         ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:97:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   97 |         scanf("%lld%lld",&a[i].x,&a[i].y);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:77:15: warning: 'num' may be used uninitialized in this function [-Wmaybe-uninitialized]
   77 |     long long num;
      |               ^~~

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Found 10 testcases.
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