【Leetcode OJ : Merge k Sorted Lists 归并排序+最小堆 mergesort heap C++ solution】的更多相关文章

Leetcode OJ : Merge k Sorted Lists 归并排序+最小堆 mergesort heap C++ solution

/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */ struct helper { ListNode *head; int len; helper(ListNode *h, int l) : head ( h ), len ( l ) {} }; class helper…

蜗牛慢慢爬 LeetCode 23. Merge k Sorted Lists [Difficulty: Hard]

题目 Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 翻译 合并k个有序的链表 Hints Related Topics: LinkedList, Divide and Conquer, Heap Solution1:Divide and Conquer 参考 归并排序-维基百科 思路:分治,先分成两个子任务,然后递归子任务,最后回溯回来..这里就…

Java for LeetCode 023 Merge k Sorted Lists

Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 解题思路一: 之前我们有mergeTwoLists(ListNode l1, ListNode l2)方法,直接调用的话,需要k-1次调用,每次调用都需要产生一个ListNode[],空间开销很大.如果采用分治的思想,对相邻的两个ListNode进行mergeTwoLists,每次将规模减少一半,直到…

【leetcode】Merge k Sorted Lists

Merge k Sorted Lists Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.   采用优先队列priority_queue 把ListNode放入优先队列中,弹出最小指后,如果该ListNode有下一个元素,则把下一个元素放入到队列中     /** * Definition for singly-linked list. * stru…

LeetCode 023 Merge k Sorted Lists

题目要求:Merge k Sorted Lists Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. Analysis The simplest solution is using PriorityQueue. The elements of the priority queue are ordered according to their natu…

[LeetCode] 23. Merge k Sorted Lists 合并k个有序链表

Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. Example: Input: [   1->4->5,   1->3->4,   2->6 ] Output: 1->1->2->3->4->4->5->6 这道题让我们合并k个有序链表,最终合并出来的结果也必须是有序的,之前做过一道 M…

[leetcode 23]Merge k Sorted Lists

1 题目 Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 2 思路 当时看到这个题目就想到的是归并排序.好吧,但是,具体代码写不出来.题目给的是数组:public ListNode mergeKLists(ListNode[] lists),我就想,怎么归并排序,然后返回一个已经排好的,再进行递归.想破脑袋没想出来. 原来,可以赋值给一个Array…

[LeetCode] 23. Merge k Sorted Lists ☆☆☆☆☆

转载:https://leetcode.windliang.cc/leetCode-23-Merge-k-Sorted-Lists.html 描述 Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. Example: Input:[ 1->4->5, 1->3->4, 2->6]Output: 1->1->2->3…

leetcode 【 Merge k Sorted Lists 】python 实现

题目: Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 代码:oj测试通过 Runtime: 231 ms # Definition for singly-linked list. # class ListNode: # def __init__(self, x): # self.val = x # self.next = None class S…

leetcode 23. Merge k Sorted Lists(堆||分治法)

Merge k sorted linked lists and return it as one sorted list. 题意:把k个已经排好序的链表整合到一个链表中,并且这个链表是排了序的. 题解:这是一道经典好题,值得仔细一说. 有两种方法,假设每个链表的平均长度是n,那么这两种方法的时间复杂度都是O(nklogk). 方法一: 基本思路是:把k个链表开头的值排个序,每次取最小的一个值放到答案链表中,这次取完之后更新这个值为它后面的一个值.接着这么取一直到全部取完.那么每次更新之后怎么对当…