LeetCode-Go/leetcode/0141.Linked-List-Cycle/141. Linked List Cycle.go

package leetcode

import (
	"github.com/halfrost/LeetCode-Go/structures"
)

// ListNode define
type ListNode = structures.ListNode

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */

func hasCycle(head *ListNode) bool {
	fast := head
	slow := head
	for slow != nil && fast != nil && fast.Next != nil {
		fast = fast.Next.Next
		slow = slow.Next
		if fast == slow {
			return true
		}
	}
	return false
}