foo.cc: In function 'int main()':
foo.cc:24:9: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   24 |     if(k-i&1)
      |        ~^~
foo.cc:8:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    8 |  scanf("%d%d",&n,&k);
      |  ~~~~~^~~~~~~~~~~~~~
foo.cc:10:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |   scanf("%d%d",&a[i],&b[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~

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Found 10 testcases.
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