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⛽️今天的内容是 Leetcode 61. 旋转链表 ⛽️💻💻💻
61. 旋转链表
给你一个链表的头节点 head
,旋转链表,将链表每个节点向右移动 k
个位置。
示例 1:
输入:head = [1,2,3,4,5], k = 2 输出:[4,5,1,2,3]
示例 2:
输入:head = [0,1,2], k = 4 输出:[2,0,1]
提示:
- 链表中节点的数目在范围
[0, 500]
内 -100 <= Node.val <= 100
0 <= k <= 2 * 109
头尾相连形成环,寻找断点,斩断
# Definition for singly-linked list.
# class ListNode:
# def __init__(self, val=0, next=None):
# self.val = val
# self.next = next
class Solution:def rotateRight(self, head: Optional[ListNode], k: int) -> Optional[ListNode]:if head is None or k == 0 :return headtmp = headcount = 1while head.next is not None :head = head.nextcount += 1head.next = tmpi = 1k %= countwhile i < count - k :tmp = tmp.nexti+=1result = tmp.nexttmp.next = Nonereturn result