链表：

61. Rotate List

Given a list, rotate the list to the right by k places, where k is non-negative.

For example:
Given 1->2->3->4->5->NULL and k = 2,
return 4->5->1->2->3->NULL.

cornercase是k大于n的时候，k = k % n;

先数出链表长度，再数出后半条链表的头的index，然后拿来。

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