foo.cc: In function 'int main()':
foo.cc:16:6: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 scanf("%d",&n);
 ~~~~~^~~~~~~~~
foo.cc:18:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&a[i].i,&a[i].l);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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