foo.cc: In function 'int main()':
foo.cc:8:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf ("%d",&t);
  ~~~~~~^~~~~~~~~
foo.cc:10:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf ("%d",&n);
   ~~~~~~^~~~~~~~~
foo.cc:12:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf ("%d",&a[i]);
    ~~~~~~^~~~~~~~~~~~
foo.cc:14:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf ("%d",&b[i]);
    ~~~~~~^~~~~~~~~~~~

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