foo.cc: In function 'int main()':
foo.cc:35:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   35 |  scanf("%d",&t);
      |  ~~~~~^~~~~~~~~
foo.cc:39:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   39 |   scanf("%d%d",&n,&k);
      |   ~~~~~^~~~~~~~~~~~~~
foo.cc:41:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |    scanf("%s",s[i]+1);
      |    ~~~~~^~~~~~~~~~~~~

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