foo.cc: In function 'int main()':
foo.cc:17:9: warning: iteration 20004 invokes undefined behavior [-Waggressive-loop-optimizations]
   17 |   if(b[i]==1&&c[i]==1)
      |      ~~~^
foo.cc:16:16: note: within this loop
   16 |  for(int i=1; i<=20005; ++i)
      |               ~^~~~~~~

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Found 10 testcases.
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