foo.cc: In function 'int main()':
foo.cc:8:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |     scanf("%lld", &l);
      |     ~~~~~^~~~~~~~~~~~
foo.cc:9:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |     scanf("%lld%lld%lld", &s, &t, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:10:33: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |     for(ll i=1; i<=m; i++) scanf("%lld", &stone[i]);
      |                            ~~~~~^~~~~~~~~~~~~~~~~~~

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