zoukankan      html  css  js  c++  java
  • LeetCode 708. Insert into a Sorted Circular Linked List

    原题链接在这里:https://leetcode.com/problems/insert-into-a-sorted-circular-linked-list/

    题目:

    Given a node from a Circular Linked List which is sorted in ascending order, write a function to insert a value insertVal into the list such that it remains a sorted circular list. The given node can be a reference to any single node in the list, and may not be necessarily the smallest value in the circular list.

    If there are multiple suitable places for insertion, you may choose any place to insert the new value. After the insertion, the circular list should remain sorted.

    If the list is empty (i.e., given node is null), you should create a new single circular list and return the reference to that single node. Otherwise, you should return the original given node.

    Example 1:


     

    Input: head = [3,4,1], insertVal = 2
    Output: [3,4,1,2]
    Explanation: In the figure above, there is a sorted circular list of three elements. You are given a reference to the node with value 3, and we need to insert 2 into the list. The new node should be inserted between node 1 and node 3. After the insertion, the list should look like this, and we should still return node 3.
    
    

    Example 2:

    Input: head = [], insertVal = 1
    Output: [1]
    Explanation: The list is empty (given head is null). We create a new single circular list and return the reference to that single node.
    

    Example 3:

    Input: head = [1], insertVal = 0
    Output: [1,0]

    Constraints:

    • 0 <= Number of Nodes <= 5 * 10^4
    • -10^6 <= Node.val <= 10^6
    • -10^6 <= insertVal <= 10^6

    题解:

    The insertion position is within 3 condition,

    1. cur go through a round back to head.

    2.  cur.val <= insertVal <= cur.next.val

    3. insertVal super max or insertVal super small, insert into the fall down position.

    Note: Pay attention to corner case, head == null. DO NOT forget to have cur = cur.next in while loop.

    Time Complexity: O(n). n = circular length.

    Space: O(1).

    AC Java:

     1 /*
     2 // Definition for a Node.
     3 class Node {
     4     public int val;
     5     public Node next;
     6 
     7     public Node() {}
     8 
     9     public Node(int _val) {
    10         val = _val;
    11     }
    12 
    13     public Node(int _val, Node _next) {
    14         val = _val;
    15         next = _next;
    16     }
    17 };
    18 */
    19 class Solution {
    20     public Node insert(Node head, int insertVal) {
    21         Node res = new Node(insertVal);
    22         if(head == null){
    23             res.next = res;
    24             return res;
    25         }
    26         
    27         Node cur = head;
    28         while(cur.next != head 
    29               && !((cur.val <= insertVal && insertVal <= cur.next.val) 
    30                    || (cur.val > cur.next.val && (cur.next.val > insertVal || cur.val < insertVal)))){
    31             cur = cur.next;
    32         }
    33         
    34         res.next = cur.next;
    35         cur.next = res;
    36         return head;
    37     }
    38 }
  • 相关阅读:
    【Mysql sql inject】【入门篇】sqli-labs使用 part 3【15-17】
    【Mysql sql inject】【入门篇】SQLi-Labs使用 part 2【12-14】
    【Mysql sql inject】【入门篇】SQLi-Labs使用 part 1【01-11】
    【CTF WEB】ISCC 2016 web 2题记录
    【Mysql sql inject】POST方法BASE64编码注入write-up
    【sql server inject】使用动态查询执行sql语句实例
    【跨站关】网络信息安全攻防学习平台跨站过关的彩蛋
    【sql inject】sql盲注技巧
    【php】随缘php企业网站管理系统V2.0 shownews.php注入漏洞
    ASP.NET新建解决方案和网站
  • 原文地址:https://www.cnblogs.com/Dylan-Java-NYC/p/12231981.html
Copyright © 2011-2022 走看看