leetcode LinkedList

leetcode 61题

Posted by franki on June 24, 2021

leetcode 61题 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]

思路

通过求余的方式，确定最终反转的位置

代码

/**
 * Definition for singly-linked list.
 * function ListNode(val, next) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.next = (next===undefined ? null : next)
 * }
 */
/**
 * @param {ListNode} head
 * @param {number} k
 * @return {ListNode}
 */
function rotateRight(head, k) {
  if (head === null || head.next === null || k === 0) {
    return head;
  }
  let newHead = new ListNode(0);
  newHead.next = head;
  let len = 0;
  let cur = newHead;
  while (cur.next) {
    len++;
    cur = cur.next;
  }
  if (k % len === 0) {
    return head;
  }
  cur.next = head;
  cur = newHead;
  for (let i=len-k%len; i>0; i--) {
    cur = cur.next;
  }
  const res = new ListNode(0);
  res.next = cur.next;
  cur.next = null;
  return res.next;
}

复杂度分析:

  • 时间复杂度: O(N)
  • 空间复杂度：O(N)
CATALOG
    FEATURED TAGS
    前端开发 H5 JavaScript 设计模式 browser jQuery 源码分析 生活 leetcode Array Stack Queue Linked List 剑指offer Binary Search Tree Binary Tree Breadth-First Search Depth-First Search String Set Binary Search Sliding Window Backtracking Dynamic Programming Two Pointers Union Find Sort Bit Operation Recursion Map Graph Search Hash LinkedList 复盘 QuickSort Trie Design MinHeap Traverse Min Heap Node.js BackEnd SQL MySQL Design Patterns Network 计算机网络 Python SVG
    FRIENDS