Method reConnect

leetcode/143. Reorder List.py:47–57

(self, first, second)

        return reHead
    # merge the two linkedlist to one
    def reConnect(self, first, second):
        head = first
        tail = first
        first = first.next
        while second:
            tail.next = second
            tail = tail.next
            second = second.next
            if first:
                first, second = second, first
        return head