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Like this (based on @EBrown@EBrown's code):
Like this (based on @EBrown's code):
You can still make this function faster and gain another second if you don't use IEnumerable and an enumerator but for example a List<int>.
IEnumerable
List<int>
You can still make this function faster and gain another second if you don't use IEnumerable and an enumerator but for example a List<int>
Original method: