foo.cc: In function 'int main()':
foo.cc:42:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   42 |         scanf("%d", &a[i]);
      |         ~~~~~^~~~~~~~~~~~~
foo.cc:51:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   51 |         scanf("%d%d", &op, &x);
      |         ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:54:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   54 |             scanf("%d", &v);
      |             ~~~~~^~~~~~~~~~

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Found 25 testcases.
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