2.6 Given a circular linked list, implement an algorithm which returns the node at the beginning of the loop.
DEFINITION
Circular linked list: A (corrupt) linked list in which a node's next pointer points to an earlier node, so as to make a loop in the linked list.
EXAMPLE
Input: A - > B - > C - > D - > E - > C [the same C as earlier]
Output: C

LeetCode中的原题，请参见我之前的博客 Linked List Cycle 单链表中的环 和 Linked List Cycle II 单链表中的环之二。

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