def odd_even_list(head) return head if head.nil? || head.next.nil? oe = head es = head.next ee = es start = oe head = head.next.next if head.next odd = true while head != nil if odd oe.next = head oe = oe.next else ee.next = head ee = ee.next end head = head.next odd = !odd end oe.next = es ee.next = nil return start end
simple ruby solution
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