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题目 Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra space? 分析 判断链表是否有环,采用快慢指针,如果相遇则表示有环 AC代码 阅读全文
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题目 Given a linked list, return the node where the cycle begins. If there is no cycle, return null. Note: Do not modify the linked list. Follow up: Can 阅读全文
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原题 Given a singly linked list L: L0?L1?…?Ln 1?Ln, reorder it to: L0?Ln?L1?Ln 1?L2?Ln 2?… You must do this in place without altering the nodes' values. 阅读全文