LeetCode-Linked List Cycle
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Given a linked list, determine if it has a cycle in it.
Follow up:
Can you solve it without using extra space?
解题思路：用两个指针来扫描链表，其中一个指针指向前面一个节点，当两个指针重合时必然存在环，否则就不存在；
代码如下：
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