/**
* Definition for singly-linked list.
* function ListNode(val) {
* this.val = val;
* this.next = null;
* }
*/
/**
* @param {ListNode} head
* @return {boolean}
*/
var hasCycle = function (head) {
if (head === null) return false
let slow = head, fast = head.next
while (fast && fast.next) {
if (slow.next === fast.next.next) return true
slow = slow.next
fast = fast.next.next
}
return false
};
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