https://oj.leetcode.com/discuss/3577/i-use-quick-sort-to-sort-the-list-but-why-i-get-time-limited View Code GITHUB: https://github.com/yuzhangcmu/LeetCode_algorithm/blob/master/list/SortList.java
For each round, the iteration is O(n). And for merge sort, we totally need run the iteration for lg(n) round(the height of recursion tree). So, the total time complexity is O(nlgn). Maybe someone can share a brief implementation. My current code is a bit fat. 1:ListNode*sortList...
循环版本号主函数例如以下: ListNode*sortList(ListNode*head){ListNode*cur=head;intsize=0;while(cur){size++;cur=cur->next;}ListNode*pre;for(intw=1;w<=size;w*=2){cur=head;for(inti=0;i<size;i+=w*2){ListNode*h1=cur,*h2=getNode(cur,w),*next=getNode(cur,2*w);cur=merge(h1,min(...
/** * Definition for singly-linked list. * public class ListNode { * int val; * ListNode next; * ListNode(int x) { val = x; } * } */ class Solution { public ListNode sortList(ListNode head) { if(head==null||head.next==null) return head; ListNode dummy = new ListNode(0); L...
class Solution: def sortList(self, head): """ :type head: ListNode :rtype: ListNode """ # 如果为空或者只有一个元素则直接返回 if not head or not head.next: return head # count表示节点个数 count, node = 0, head # 获取节点的个数 ...
Sort a linked list inO(nlogn) time using constant space complexity. 解题思路:看到这个时间复杂度就能想到归并排序或者快速排序算法,这里我就用相对简单的归并排序解决,解决思路和数组的归并排序一致。 func sortList(head *ListNode) *ListNode { if head == nil || head.Next == nil { ...
LeetCode Sort List 链表排序(规定 O(nlogn) ) Status: Accepted Runtime: 66 ms 题意:根据给出的单链表,用O(nlogn)的时间复杂度来排序。由时间复杂度想到快排、归并这两种排序。本次用的是归并排序。递归将链表的规模不断二分到只剩下1或2个元素为止,这也是递归出口,一旦出现这两种情况就可以返回。这里...
classSolution:defmissingNumber(self,nums:List[int])->int:nums.sort()ifnums[-1]!=len(nums):returnlen(nums)elifnums[0]!=0:return0foriinrange(1,len(nums)):#从1开始检查,把0作为nums[i-1]+1的起点expected_num=nums[i-1]+1ifnums[i]!=expected_num:returnexpected_num ...
From: LeetCode Link:147. Insertion Sort List Solution: Ideas: 1. Node Definition and Creation: The ListNode structure defines a node in a singly linked list. The createNode function creates a new node with a given value. 2. Insertion Sort Function: ...
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