import java.util.ArrayList; import java.util.List; import java.util.PriorityQueue; /** * Source : https://oj.leetcode.com/problems/merge-k-sorted-lists/ * * Created by lverpeng on 2017/7/11. * * Merge k sorted linked lists and return it as one sorted…

Title: Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 排好序的,然后merge,很容易让人联想到归并排序.可以将k个序列按照二分进行分割,然后当长度为1时返回一个排好序的序列,最后将两个序列merge class Solution{ public: ListNode* merge(ListNode* list1, ListNode* lis…

Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 这道题让我们合并k个有序链表,之前我们做过一道Merge Two Sorted Lists 混合插入有序链表,是混合插入两个有序链表.这道题增加了难度,变成合并k个有序链表了,但是不管合并几个,基本还是要两两合并.那么我们首先考虑的方法是能不能利用之前那道题的解法来解答此题.答案是肯定的,但是需要修改…

利用堆栈:http://oj.leetcode.com/problems/evaluate-reverse-polish-notation/http://oj.leetcode.com/problems/longest-valid-parentheses/ (也可以用一维数组,贪心)http://oj.leetcode.com/problems/valid-parentheses/http://oj.leetcode.com/problems/largest-rectangle-in-histo…

利用堆栈:http://oj.leetcode.com/problems/evaluate-reverse-polish-notation/http://oj.leetcode.com/problems/longest-valid-parentheses/ (也可以用一维数组,贪心)http://oj.leetcode.com/problems/valid-parentheses/http://oj.leetcode.com/problems/largest-rectangle-in-histo…

原链接:http://blog.csdn.net/yangliuy/article/details/44514495 注:此分类仅供大概参考,没有精雕细琢.有不同意见欢迎评论~ 利用堆栈:http://oj.leetcode.com/problems/evaluate-reverse-polish-notation/http://oj.leetcode.com/problems/longest-valid-parentheses/ (也可以用一维数组,贪心)http://oj.leetcode.…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 23: Merge k Sorted Listshttps://oj.leetcode.com/problems/merge-k-sorted-lists/ Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. ===Comments…

题目来源: https://leetcode.com/problems/merge-k-sorted-lists/ 题意分析: 给定k个有序的链表,将这些链表整合成一个新的有序链表. 题目思路: 前面我们已经给出了两个有序链表整合的做法.这里,我们不妨用归并排序的想法,把n个链表看成 n/2 和n - n/2的整合,直到n/2 <= 1.时间复杂度是 O(n * (2^log k)) = O(n * k). 代码(python): # Definition for singly-linked l…

https://oj.leetcode.com/problems/merge-k-sorted-lists/ 归并K已经整理阵列,和分析算法的复杂. 解决报告:无论是不考虑优化,最简单的实现是要重新走路List<ListNode>.对当中每一个链表同当前链表做一遍类似于归并排序最后一步的merge操作. 算法复杂度是O(KN) public class Solution { ListNode mergeTwoLists(ListNode list1, ListNode list2) { Lis…

LeetCode 题目总结/分类 利用堆栈: http://oj.leetcode.com/problems/evaluate-reverse-polish-notation/ http://oj.leetcode.com/problems/longest-valid-parentheses/ (也可以用一维数组,贪心) http://oj.leetcode.com/problems/valid-parentheses/ http://oj.leetcode.com/problems/large…