Commit 1346da1

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added daily challenge

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	`1`	`+# Definition for singly-linked list.`
	`2`	`+# class ListNode:`
	`3`	`+# def __init__(self, x):`
	`4`	`+# self.val = x`
	`5`	`+# self.next = None`
	`6`	`+`
	`7`	`+class Solution:`
	`8`	`+ def hasCycle(self, head: Optional[ListNode]) -> bool:`
	`9`	`+ fast = slow = head`
	`10`	`+`
	`11`	`+ while fast and fast.next:`
	`12`	`+ slow, fast = slow.next, fast.next.next`
	`13`	`+ if fast == slow:`
	`14`	`+ return True`
	`15`	`+`
	`16`	`+ return False`

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