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
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
// 快慢指针
bool hasCycle(ListNode *head) {
ListNode* fast = head;
ListNode* low = head;
while(fast && fast->next)
{
fast = fast->next->next;
low = low->next;
if(fast == low)
{
return true;
}
}
return false;
}
};
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