题解 | #判断链表中是否有环#
判断链表中是否有环
https://www.nowcoder.com/practice/650474f313294468a4ded3ce0f7898b9?tpId=295&tqId=605&ru=%2Fpractice%2Fb58434e200a648c589ca2063f1faf58c&qru=%2Fta%2Fformat-top101%2Fquestion-ranking&sourceUrl=%2Fexam%2Fcompany
package main
import . "nc_tools"
/*
* type ListNode struct{
* Val int
* Next *ListNode
* }
*/
/**
*
* @param head ListNode类
* @return bool布尔型
*/
func hasCycle(head *ListNode) bool {
// write code here
pre, cur := head, head
for pre != nil && cur != nil && cur.Next != nil {
pre = pre.Next //走1步
cur = cur.Next.Next //走2步
if pre == cur {
return true
}
}
return false
}
#链表双指针#