You should move line: visitedNumbers.add(number);
after the if clause (otherwise the sums like 4+4=8 will be counted)
A compare i made for the Set vs HashTable jsperf.com/add-to-k
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You should move line:
visitedNumbers.add(number);
after the if clause (otherwise the sums like 4+4=8 will be counted)
A compare i made for the Set vs HashTable
jsperf.com/add-to-k