因为很懒,没有时间,只会口胡等等原因,所以有些题目就不打code了 $luogu:$ P1973 [NOI2011]Noi嘉年华: 时间离散化,预处理一个区间$[l,r]$内的最多活动个数$in[l][r]$ 无限制: 设$f[i][j]$表示到第$i$个时间点,第一个会场开$j$个活动时,第二个会场的最大活动数量 $f[i][j]=max(f[k][j-in[k][i]],f[k][j]+in[k][i])$ 有限制: 把时间分成三段,上面的dp倒着跑一遍得出$g[i][j]$ 枚举必须取区间…

The question and solution are from: http://www.geeksforgeeks.org/convert-given-binary-tree-doubly-linked-list-set-3/ Given a Binary Tree (BT), convert it to a Doubly Linked List(DLL) In-Place. The left and right pointers in nodes are to be used as pr…

Welcome back! This time, we’ll look into what is perhaps the “poster boy” feature introduced with the D3D11 / Shader 5.x hardware generation: Tessellation. This one is interesting both because it’s a fun topic, and because it marks the first time in…

Regular Expression Matching Implement regular expression matching with support for '.' and '*'. '.' Matches any single character. '*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). The…

There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the third round, you toggle every third bulb (turning on if it's off or turning off if it's on). For the ith round, you toggle every i…

Given a string array words, find the maximum value of length(word[i]) * length(word[j]) where the two words do not share common letters. You may assume that each word will contain only lower case letters. If no such two words exist, return 0. Example…

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 "(]" and "([)]"…

@link http://www.cnblogs.com/zuoyuan/p/3781953.htmlGiven an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array represents your maximum jump length at that position. Your goal is to…

Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each number in C may only be used once in the combination. Note: All numbers (including target) will be posi…

地址:http://codeforces.com/contest/872/problem/D 题目: D. Something with XOR Queries time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output This is an interactive problem. Jury has hidden a permutati…

https://github.com/Premiumlab/Python-for-Algorithms--Data-Structures--and-Interviews/blob/master/Mock%20Interviews/Ride%20Share%20Start-Up%20Company/Ride%20Share%20Company%20-%20Interview%20Questions%20-%20SOLUTIONS/On-Site%20Question%203%20-%20SOLUT…

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https://github.com/Premiumlab/Python-for-Algorithms--Data-Structures--and-Interviews/blob/master/Mock%20Interviews/Large%20Search%20Engine%20Company%20/Search%20Engine%20Company%20-%20Interview%20Problems%20-%20SOLUTIONS/On-Site%20Question%204%20-%20…

On-Site Question 3 - SOLUTION Question Given a string, write a function that uses recursion to reverse it. Requirements You MUST use pen and paper or a whiteboard to answer this, no coding allowed!     SOLUTION Hopefully you remember this problem, yo…

https://github.com/Premiumlab/Python-for-Algorithms--Data-Structures--and-Interviews/blob/master/Mock%20Interviews/Large%20Search%20Engine%20Company%20/Search%20Engine%20Company%20-%20Interview%20Problems%20-%20SOLUTIONS/On-Site%20Question%202%20-%20…

https://github.com/Premiumlab/Python-for-Algorithms--Data-Structures--and-Interviews/blob/master/Mock%20Interviews/Large%20Search%20Engine%20Company%20/Search%20Engine%20Company%20-%20Interview%20Problems%20-%20SOLUTIONS/On-Site%20Question%201%20-%20…

https://github.com/Premiumlab/Python-for-Algorithms--Data-Structures--and-Interviews/blob/master/Mock%20Interviews/Large%20E-Commerce%20Company/E-Commerce%20Company%20-%20Interview%20Problems%20-%20SOLUTIONS/On-Site%20Question%203%20-%20SOLUTION.ipyn…

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https://github.com/Premiumlab/Python-for-Algorithms--Data-Structures--and-Interviews/blob/master/Mock%20Interviews/Social%20Network%20Company/Social%20Network%20Company%20-%20Interview%20Questions%20-%20SOLUTIONS/On-Site%20Question%203%20-%20SOLUTION…

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错误信息:usr/bin/pip: No such file or directory 解决办法(一共四步,按照下面的步骤来从1到4,最后你会发现问题都解决了): 1.which pip /usr/local/bin/pip 2.pip -su: /usr/bin/pip: No such file or directory 3.type pip pip is hashed (/usr/bin/pip) So pip is definintely in /usr/local/bin/pip bu…

14. Longest Common Prefix My Submissions Question Editorial Solution Total Accepted: 97052 Total Submissions: 345681 Difficulty: Easy Write a function to find the longest common prefix string amongst an array of strings. Subscribe to see which compan…

Given a text file file.txt, print just the 10th line of the file. Example: Assume that file.txt has the following content: Line 1 Line 2 Line 3 Line 4 Line 5 Line 6 Line 7 Line 8 Line 9 Line 10 Your script should output the tenth line, which is: Line…

All questions are simple level. Construct String from Binary Tree Question[606]:You need to construct a string consists of parenthesis and integers from a binary tree with the preorder traversing way. The null node needs to be represented by empty pa…

E. The penguin's game time limit per test: 1 second memory limit per test: 256 megabytes input: standard input output: standard output Pay attention: this problem is interactive. Penguin Xoriy came up with a new game recently. He has n icicles number…

大家好!我是 Johngo 呀! 和大家一起刷题不快不慢,没想到已经进行到了第二阶段,「动态规划」这部分题目很难,而且很不容易理解,目前我的题目做了一半,凭着之前对于「动态规划」的理解和最近做的题目做一个阶段性的总结!这篇文章其实是我之前写过的一篇,然后现在拿来再做一个润色. 「动态规划」看这篇我...保证可以! 目标:给小白以及没有明确思路的同学一个指引! 拍胸脯保证:读完这篇文章,对于大多数的动态规划的思维逻辑能有一个质的提升. 本文较长,建议先收藏,或者直接到 GitHub 中下载文档(h…

96. Unique Binary Search Trees My Submissions Question Editorial Solution Total Accepted: 82788 Total Submissions: 220611 Difficulty: Medium Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example, Given…

解决办法:apt-get update或者apt-get cleanapt-get update 或者 apt-get update --fix-missing问题解析1 source本身的问题 根据提示,我们首先应当 apt-get update 一下source,如果在apt-get update后依然报这个error,那就说明这个source本省就有错误,尝试apt-get update --fix-missing后依旧报这个error,果断换source 2 网络的问题 网关错误拦截了数…

INTRODUCTION THE SELENIUM PROJECT AND TOOLS Selenium controls web browsers Selenium is many things, but at its core it's a toolset for web browser automation that uses the best techniques available to remotely control browser instances and emulate a…