Leetcode 题目整理-5 Valid Parentheses & Merge Two Sorted Lists

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Leetcode 题目整理-5 Valid Parentheses & Merge Two Sorted Lists

20. Valid Parentheses Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}" are all valid but "(]&quo…

【LeetCode】【数组归并】Merge k Sorted Lists

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->4->4->5->6 思路借鉴Merge Two Sorted Lists的解决思路,对两个数…

Leetcode练习题21. Merge Two Sorted Lists

题目描述(easy) Merge Two Sorted Lists Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. Example: Input: 1->2->4, 1->3->4 Output: 1->1->2->3->4-…

乘风破浪：LeetCode真题_032_Longest Valid Parentheses

乘风破浪:LeetCode真题_032_Longest Valid Parentheses 一.前言这也是非常有意思的一个题目,我们之前已经遇到过两个这种括号的题目了,基本上都要用到堆栈来解决,这次最简单的方法当然也不例外. 二.Longest Valid Parentheses 2.1 问题 2.2 分析与解决通过分析题意,这里我们有几种方法: 暴力算法: public class Solution { public boolean isValid(String s)…

[LeetCode] 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. 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…

[LeetCode] Merge Two Sorted Lists 混合插入有序链表

Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. 这道混合插入有序链表和我之前那篇混合插入有序数组非常的相似Merge Sorted Array,仅仅是数据结构由数组换成了链表而已,代码写起来反而更简洁.具体思想就是新建一个链表,然后比较两个链表中的元素值,把较小的…