zoukankan      html  css  js  c++  java
  • 147. Insertion Sort List

    Sort a linked list using insertion sort.


    A graphical example of insertion sort. The partial sorted list (black) initially contains only the first element in the list.
    With each iteration one element (red) is removed from the input data and inserted in-place into the sorted list

     

    Algorithm of Insertion Sort:

    1. Insertion sort iterates, consuming one input element each repetition, and growing a sorted output list.
    2. At each iteration, insertion sort removes one element from the input data, finds the location it belongs within the sorted list, and inserts it there.
    3. It repeats until no input elements remain.


    Example 1:

    Input: 4->2->1->3
    Output: 1->2->3->4
    

    Example 2:

    Input: -1->5->3->4->0
    Output: -1->0->3->4->5

    AC Code:

    /**
     * Definition for singly-linked list.
     * struct ListNode {
     *     int val;
     *     ListNode *next;
     *     ListNode(int x) : val(x), next(NULL) {}
     * };
     */
    class Solution {
    public:
        ListNode* insertionSortList(ListNode* head) {
            ListNode* dummy = new ListNode(0);
            ListNode* cur = head;
            dummy->next = head;
            ListNode* prev = NULL;
            ListNode* temp = NULL;
            while (cur != NULL && cur->next != NULL) {
                if (cur->val <= cur->next->val) {
                    cur = cur->next;
                } else {
                    temp = cur->next;
                    cur->next = temp->next;
                    prev = dummy;
                    while (prev->next->val <= temp->val) {
                        prev = prev->next;
                    }
                    temp->next = prev->next;
                    prev->next = temp;
                }
            }
            return dummy->next;
        }
    };
    
    Runtime: 12 ms, faster than 99.91% of C++ online submissions for Insertion Sort List.
    永远渴望,大智若愚(stay hungry, stay foolish)
  • 相关阅读:
    windows下的IO模型之选择(select)模型
    tcp通讯中socket套接字accept和listen的关系
    转一篇shell中关于各种括号的讲解
    记两个std接口equal_range,set_difference
    nginx学习
    c++ 读取文本问题
    vim使用常看
    CNN设计一些问题
    什么是反射?反射机制的应用场景有哪些?
    java为什么只有值传递?
  • 原文地址:https://www.cnblogs.com/h-hkai/p/9870780.html
Copyright © 2011-2022 走看看