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环形链表 #14
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题目地址:环形链表
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解题思路
参考操场跑步,跑的快的,会有一个点,正好赶上跑的慢的
对应就是两个指针,一个跑的慢,p1 = p1.next
一个跑的快 p2 = p2.next.next
只要是环形链表,这俩总会相等, 否则就不是