foo.cc: In function 'int main()':
foo.cc:16:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for (int i=1;i<=10;i++) scanf("%d",&e[i]);
                          ~~~~~^~~~~~~~~~~~
foo.cc:17:44: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for (int i=1;i<=n;i++) scanf("%d",&p[i].w),p[i].d=i;
                         ~~~~~~~~~~~~~~~~~~~^~~~~~~~~

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