foo.cc: In function 'int main()':
foo.cc:11:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 |     scanf("%s%d",ans+1,&n);
      |     ~~~~~^~~~~~~~~~~~~~~~~
foo.cc:16:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |         scanf("%s",opt);
      |         ~~~~~^~~~~~~~~~
foo.cc:30:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |             scanf("%s",c);
      |             ~~~~~^~~~~~~~

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Found 5 testcases.
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