【IT笔试面试题整理】判断链表是否存在环路，并找出回路起点

【试题描述】定义一个函数，输入一个链表，判断链表是否存在环路，并找出回路起点 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

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