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Thanks a lot!
int ones = Integer.bitCount(k1 & Nones);
Is "k1 & Nones" necessary here?
if (!(count.get(k1) == N/2 && count.get(k2) == (N+1)/2) &&
!(count.get(k2) == N/2 && count.get(k1) == (N+1)/2))
can be simplified to :
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