foo.cc: In function 'int main()':
foo.cc:32:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   32 |     scanf("%d %d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~~
foo.cc:34:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   34 |       scanf("%d",&w[i]);
      |       ~~~~~^~~~~~~~~~~~

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