166 - Find the non-duplicate number - find-the-non-duplicate-number.txt

Hi, here's your problem today. This problem was recently asked by Facebook:

Given a list of numbers, where every number shows up twice except for one number, find that one number.

Example:
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Top | Category: Computing | Comments (0) | Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Problem, Data Structures and Algorithms, | English | 310 Views, 18692 Search Bots | 60 Words

167 - Two-Sum - two-sum.txt

Hi, here's your problem today. This problem was recently asked by Facebook:

You are given a list of numbers, and a target number k. Return whether or not there are two numbers in the list that add up to k.

Example:
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Top | Category: Computing | Comments (0) | Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Problem, Data Structures and Algorithms, | English | 1239 Views, 16131 Search Bots | 76 Words

168 - Sorting a list with 3 unique numbers - sorting-a-list-with-3-unique-numbers.txt

Hi, here's your problem today. This problem was recently asked by Google:

Given a list of numbers with only 3 unique numbers (1, 2, 3), sort the list in O(n) time.

Example 1:
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Top | Category: Computing | Comments (0) | Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Problem, Data Structures and Algorithms, | English | 343 Views, 22540 Search Bots | 51 Words

169 - Reverse a Linked List - reverse-a-linked-list.txt

Hi, here's your problem today. This problem was recently asked by Google:

Given a singly-linked list, reverse the list. This can be done iteratively or recursively. Can you get both solutions?

Example:
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Top | Category: Computing | Comments (0) | Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Problem, Data Structures and Algorithms, | English | 358 Views, 18423 Search Bots | 149 Words

170 - First and Last Indices of an Element in a Sorted Array - daily-problem-first-and-last-indices-of-an-element-in-a-sorted-array.txt

Hi, here's your problem today. This problem was recently asked by AirBNB:

Given a sorted array, A, with possibly duplicated elements, find the indices of the first and last occurrences of a target element, x. Return -1 if the target is not found.

Example:
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Top | Category: Computing | Comments (0) | Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Problem, Data Structures and Algorithms, | English | 290 Views, 32307 Search Bots | 87 Words

171 - [Daily Problem] Validate Balanced Parentheses - daily-problem-validate-balanced-parentheses.txt

Hi, here's your problem today. This problem was recently asked by Uber:

Imagine you are building a compiler. Before running any code, the compiler must check that the parentheses in the program are balanced. Every opening bracket must have a corresponding closing bracket. We can approximate this using strings.

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
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Top | Category: Computing | Comments (0) | Tags: 每日算法, 括号匹配, 面试, Python, daily problem, Validate Balanced Parentheses, algorithms, twitter interview question, python, | English | 279 Views, 20069 Search Bots | 161 Words

172 - [Daily Problem] Longest Palindromic Substring - daily-problem-twitter-palindrome.txt

Hi, here's your problem today. This problem was recently asked by Twitter:

A palindrome is a sequence of characters that reads the same backwards and forwards. Given a string, s, find the longest palindromic substring in s.

Example:
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Top | Category: Computing | Comments (0) | Tags: 每日算法, 回文数, 面试, Python, daily problem, palindrome, algorithms, twitter interview question, python, | English | 345 Views, 16869 Search Bots | 69 Words

173 - Longest Substring Without Repeating Characters - daily-problem-longest-substring-without-repating-characters.txt

This problem was recently asked by Microsoft:

Given a string, find the length of the longest substring without repeating characters.

Here is an example solution in Python language. (Any language is OK to use in an interview, though we'd recommend Python as a generalist language utilized by companies like Google, Facebook, Netflix, Dropbox, Pinterest, Uber, etc.,)
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Top | Category: Computing | Comments (0) | Tags: 微软, 面试题, 最长子字符串, Microsoft, interview questions, daily problems, longest substring, | English | 310 Views, 20080 Search Bots | 81 Words

174 - [Daily Problem] Add two numbers as a linked list - daily-problem-add-two-numbers-as-a-linked-list.txt

This problem was recently asked by Microsoft: You are given two linked-lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.

Example:
Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8
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Top | Category: Computing | Comments (0) | Tags: 每天算法, 算法, 数据结构, 链表, daily problem, linked list, programming, algorithm, | English | 293 Views, 25445 Search Bots | 214 Words

175 - Girls do not always like flowers - girls-do-not-like-flowers.txt

又送花？六一送花，情人节还送花？！你不会买两瓶九（酒）啊，我不喝醉，你有机会，你有机会吗？！

女孩子要包的，包治百病，包能让女人达到GC的（G点）。
Top | Category: Videos | Comments (0) | Tags: 情人节还送花, 送女人礼物, valentine, | 中文 | 408 Views, 19184 Search Bots | 54 Characters

176 - 亚马逊雨林是“地球之肺”，但是如果它烧没了，我们并不会因为缺氧而憋死 - amazon-fire.txt


今天看到Peter Brannen写了一个很好的问题。虽然我们喜欢说亚马逊雨林是“地球之肺”，亚马逊的火灾也确实是生态和人道的双重灾难，但是如果它烧没了，我们并不会因为缺氧而憋死。

有一个经常引用的数据是亚马逊产出了地球氧气的20%，但它是双重的不准确。一，亚马逊每天产出的氧气实际上是地球上所有活体生物光合作用产氧总量的6%；二，地球上绝大部分氧气，并不是现在活着的生命造出来的。

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Top | Category: News | Comments (0) | Tags: 亚马逊, 大火, Amazon Rainforest fire, | 中文 | 939 Views, 17251 Search Bots | 1390 Characters

177 - 国家目前拥有和积累财富最多的是哪一代人？ - which-generation-is-richest.txt

你觉得我们国家目前拥有和积累财富最多的是哪一代人？答案是60年代人口高峰出生的一代人。63年开始我国每年出生人口都超过2500万，这批人正好碰到改开，整体学历都不高，满打满算都不可能有5%的人正规读过大学。这批人当中生活优良的中产阶级到底是怎么来的？是因为他们敢打敢拼敢创造？

不是的。就像昨天我写微博问答的时候有人问到环球的主编胡锡进先生，他就自己讲过自己的经历。04年的时候贷款总价不到百万在北京买了套140平的房子，现在光这套房子就能给他带来千万的身家。那个年代普遍过的好的人就是找份稳定工作，该结婚的时候结婚，该买房的时候买房，该生孩子的时候生孩子。要是碰巧“有投资眼光”多买了一套房子，根本就不会想着要儿女养老，而是老了还能补贴自己新时代高学历的子女。

你要是90年后出生的人，看着这样的老一代心里能平衡吗？人家学历不如你，工作态度也比不上你勤奋，没有996的加班，也没有所谓的见识。思想顽固，跟不上潮流。但是人家就是比你有钱啊。你现在哪怕人大新闻系毕业走进报社靠工资一辈子不吃不喝都不可能买得起北京一套140平的房子的。
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Top | Category: Others | Comments (0) | Tags: 积累财富, 哪一代人, richest generation, | 中文 | 407 Views, 18277 Search Bots | 960 Characters

178 - 小事 | 选择比努力更重要 - importance-of-a-decision.txt

我北邮电子工程本，电子系计算机应用专业硕，05 年毕业。这个起点如何？

我每天都在加班，晚上周末在持续学习跟踪新技术，努力程度怎么说呢我没见过比我更努力的，这个努力程度如何？

然而我今年 39 岁，失业两个多月，投出去简历至今一个约面试的都没有。
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Top | Category: Computing | Comments (0) | Tags: 选择, 努力, 重要, Decision Making, | 中文 | 349 Views, 20141 Search Bots | 979 Characters

179 - 男青年择偶指南 - how-to-relation-girl.txt

1.不要在一棵树上吊死。平时要多接触女生，基数大才有选择余地。喜欢就追，发现不合适马上追另外一个，不要迟疑，不要沉浸。实践出真知，只有多谈、多睡、多相处，你才会更了解人性，更了解女性，更了解所谓的两性关系，更了解什么样的女生适合自己、如何娶到这样的女生。

2.善用择偶期长这个性别优势。在婚恋方面，女人过了25岁就开始走下坡路了，过了30岁就不得不降低标准要求了。而男人则不同，即便是40岁，如果有成就，一样可以娶年轻女生。所以，男人的择偶策略和女人是不一样的，作为男人应该秉持一个原则：不行就换。反正有的是时间成本换，可以慢慢挑。

3.多发好人卡。不要彻底的拒绝身边对自己有好感的姑娘，要向女生学习，多说“你是个好人”。经常约出来吃吃饭，多认识她的闺蜜。
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Top | Category: Love and Romantics | Comments (0) | Tags: 男青年择偶指南, 凤凰男, 处女, How-to, relation, girl, | 中文 | 2170 Views, 23708 Search Bots | 9541 Characters

180 - 儿童编程热和计算机思维的培养 - computational-thinking-for-children.txt

AI（人工智能）的潮流轰轰烈烈而来，“深度学习”的字眼处处可以见， 面向儿童的编程课也成了热门课，好多家长都愿意付费让孩子去学。

先不说这些编程课质量如何，效果如何，就随便聊聊 “学习编程要不要早早开始”？

周末跟一个英国人工智能公司的小伙子聊了一下。 他是N大物理系毕业的，现在AI领域做得相当好， 不但公司里头的项目客户包括银行律所医院学校，而且自己业余做的项目客户里头有石油大公司。 他的观察是大学里头学计算机专业的，反而被困住了，在AI项目组里头往往成为边缘人员。而物理数学专业出来的，更擅长数学模型的思考和运算，可以在更高的一个层面上去思考问题，倒是项目的核心人员。他还举例说，90年代出国的好些华人其实都是数学很强的，可大多为了生计，转做码工，专职编程。现在AI热浪来了， 要转过来就觉得很吃力了。
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Top | Category: Computing | Comments (0) | Tags: 儿童, 编程热, 计算机思维, 培养, Children, computational thinking training, | 中文 | 324 Views, 20123 Search Bots | 670 Characters