James Pan

原题网址：https://leetcode.com/problems/find-the-duplicate-number/ Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate nu

原题网址：https://leetcode.com/problems/linked-list-cycle-ii/ 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.

原题网址：https://leetcode.com/problems/linked-list-cycle/ Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra space? 方法：使用两个指针。 /** * Defini