foo.cc: In function 'int main()':
foo.cc:11:12: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 int T;scanf("%d",&T);
       ~~~~~^~~~~~~~~
foo.cc:14:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
 int k,n;scanf("%d%d",&k,&n);
         ~~~~~^~~~~~~~~~~~~~

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