[leetcode] 一些会的
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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