foo.cc: In function 'int main()':
foo.cc:11:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k,ans,cnt;
          ^
foo.cc:11:16: warning: variable 'cnt' set but not used [-Wunused-but-set-variable]
  int i,j,k,ans,cnt;
                ^~~
foo.cc:10:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&T);
  ~~~~~^~~~~~~~~
foo.cc:16:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&N);
   ~~~~~^~~~~~~~~
foo.cc:19:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d",&a[i]);
    ~~~~~^~~~~~~~~~~~

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