leetcode 148. Sort List 提交网址: https://leetcode.com/problems/sort-list/ Total Accepted: 68702 Total Submissions: 278100 Difficulty: Medium ACrate: 24.7% Sort a linked list in O(n log n) time using constant space complexity. 由于需要使用常量空间,即S(n)=O(1),故需要…
Sort List Sort a linked list in O(n log n) time using constant space complexity. 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 解法1 归并排序.用两个函数实现: merge:将两个有…
Sort a linked list in O(n log n) time using constant space complexity. 题解:实现一个链表的归并排序即可.主要分为三部分: 1.找到中点并返回的函数findMiddle; 2.归并函数merge; 3.排序函数sortList. 数组的findMiddle函数非常容易实现,链表就有一点tricky了.首先设置两个指针,一个slow初始化为head,一个fast初始化为head.next,然后slow一次走一步,fast一次走两…
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…
Sort a linked list in O(n log n) time using constant space complexity. 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 常见排序方法有很多,插入排序,选择排序,堆排序,快速排序,冒泡排序,归并排序…
Sort a linked list in O(n log n) time using constant space complexity. 问题:对一个单列表排序,要求时间复杂度为 O(n*logn),额外空间为 O(1). O(n*logn) 时间排序算法,无法是 quick sort, merge sort, head sort.quick sort 需要灵活访问前后元素,适合于数组,merge sort 只需要从左到右扫过去即可,可用于列表结构. 当列表元素个数大于2时,将列表拆分为左右…
Sort a linked list in O(n log n) time using constant space complexity. 解题思路: 归并排序.快速排序.堆排序都是O(n log n),由于优先级队列是用堆排序实现的,因此,我们使用优先级队列即可,JAVA实现如下: public ListNode sortList(ListNode head) { if(head==null||head.next==null) return head; Queue<ListNode> pQ…
Sort a linked list in O(n log n) time using constant space complexity. 排序,要求是O(nlog(n))的时间复杂度和常数的空间复杂度,那么就使用归并就可以了. /** * Definition for singly-linked list. * public class ListNode { * int val; * ListNode next; * ListNode(int x) { val = x; } * } */ p…
原题地址 链表归并排序 真是恶心的一道题啊,哇了好多次才过. 代码: void mergeList(ListNode *a, ListNode *b, ListNode *&h, ListNode *&t) { h = t = NULL; while (a && b) { ListNode *c = NULL; if (a->val <= b->val) { c = a; a = a->next; } else { c = b; b = b->…