题目: Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. You should ...
思路: . 空间复杂度为 o n 解法. 创建两个链表, 分别记录大于 x 和小于 x 的节点, 最后合并 . o 的空间复杂度解法. 四个指针, 分别指向小于 x 部分链表的头, 尾, 指向大于 x 部分链表的头, 尾 总结: . 使用 dummyNode 减少判断 代码: class Solution public: ListNode partition ListNode head, int ...
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题目: Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. You should ...
原题地址:https://oj.leetcode.com/problems/partition-list/ 题意: Given a linked list and a value x, partition it such that all nodes less than x come ...
Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. You should preserve ...
A string S of lowercase letters is given. We want to partition this string into as many parts as possible so that each letter appears in at most ...
Given an array of 2n integers, your task is to group these integers into n pairs of integer, say ...
题目如下:(题目链接) Sort a linked list in O(n log n) time using constant space complexity. 在上一题中使用了插入排序,时间复杂度为O(n^2)。nlogn的排序有快速排序、归并排序、堆排序。双向链表用快排比较适合,堆排序 ...
原题地址:http://oj.leetcode.com/problems/sort-list/ 题意:链表的排序。要求:时间复杂度O(nlogn),空间复杂度O(1)。 解题思路:由于题目对时间复杂度和空间复杂度要求比较高,所以查看了各种解法,最好的解法就是归并排序,由于链表在归并操作时 ...
题目: Given a list, rotate the list to the right by k places, where k is non-negative. For example: Given 1->2->3->4->5->NULL and k ...