摘要：
Given a linked list, determine if it has a cycle in it. Example Given -21->10->4->5, tail connects to node index 1, return true Given -21->10->4->5, t 阅读全文
摘要：
A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null. Return a deep copy 阅读全文
摘要：
Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. If the number of nodes is not a multiple of k then l 阅读全文