721. Accounts merge

March 28, 2019

Introduction

I like to start to work on union find algorithms tagged on Leetcode.com. Leetcode 721 Accounts merg is the first algorithm I worked on.

721. Account merge

Here is my solution folder.

Understanding the challenges

It is time for me to review myself as a software programmer after one year Amazon Seattle onsite interview. Do I show strong determination to work hard and push myself hard to improve?

It is hard for me to tell. I did move on my personal finance research and was so glad to adopt frugality and minimalist as my life style choice, and I also had great time to learn new things from personal finance.

It is not easy for every one to advance his/ her career as a software programmer. What I can do is to continue to push myself to stay outside the comfortable zone. I need to solve more algorithms on Leetcode.

How To Get A Job At Google | The Ultimate Guide To Algorithmic/Coding Interviews

Here is the link.

Back To Back SWE

Here is the link.

The #1 Reason Why 70% of Wealthy Families Lose All Their Money

Here is the link.

"WHY Are You BROKE?!" | Dan Lok (@danthemanlok) | Top 10 Rules

Here is the link.

201 3438 VANNESS AVENUE

Here is the link.

$299,999

201 3438 VANNESS AVENUE
Vancouver, British Columbia

MLS® Number: R2350727

Convenient location! Right across from the skytrain station, and walking distance to the 
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Very well maintained building, 1 Parking + 1 Locker, PETS & RENTALS allowed. Perfect 
INVESTMENT or move in! Open house Mar 30& 31, Sat & Sun 2-4 pm. The first private 
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$380 maintenance fee monthly

Minimalist Approach To Investing 💸 (The "Lazy" 3 Fund Portfolio)

Here is the link.

420 13321 102A AVENUE, North Surrey

Here is the link. 

420 13321 102A AVENUE North Surrey, Apartment/Condo | 417 sq ft, year built: 2009 in Whalley. Style: Upper Unit, beds & 1 baths, listed for $298,000.

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3 Mental Tricks To Reduce Your Fear of Public Speaking

March 27, 2019

Introduction

I like to do a short research how to reduce my fear when I perform algorithm problem solving. It may help me to perform better next time.


Take my notes

Here is the link.

Public speaking - leverage the speech, not one to one.

13:00/ 17:30

You do not practice enough so you will be nervous.

Day one for my health research blogging

March 27, 2019

Introduction

It is my health research day one. I like to write some blogs related to the health, how to handle stress and live happy life as a software programmer.

Case study

I like to write blogs related to health. It is challenging life to learn when I am busy with my personal finance, algorithm and data structure problem solving, and then housing problem, retirement saving, and all other issues.

春招未过，秋招已晚？

Here is the article.

二、招聘量变化

去年各大科技公司提前发布职位，似乎透漏着科技公司招聘即将复苏的信号。

2018年11月，Amazon宣布其“第二总部”即将落户在弗吉尼亚州水晶城和纽约，将为两地分别带来25,000个工作岗位。虽然最终Amazon“退缩”，取消纽约分部建设，但其仍有大量空缺职位等待填充。

Google也不断扩充，在硅谷“圈地建房”，大量空缺职位涌现；同时宣布预计投资10亿美元，在纽约哈德逊广场建立新园区，以24亿美元买下曼哈顿雀儿喜市场的建筑物，再于57号码头承租空间，Google预计2020年及2022年等哈德逊广场及Washington Street办公区落成后迁至新居。未来10年员工人数扩增超过2倍。

Apple宣布公司将斥资十亿美元，在德州奥斯汀建立新总部。新园区占地约133英亩，直接带来5000个空缺岗位，除此之外，Apple在美国的各个分部，也都在积极扩充。

同时，各大科技公司在芝加哥的分部也频传扩张信息，Facebook曾确认在芝加哥的扩张计划。将在位于151 N. Franklin St的办公大楼内额外租用总面积26.3万平方英尺的办公空间，预计最多可容纳2000名员工。

很显然，这些空缺职位的招聘不可能短时间内完成，所以可以预见，今年秋招各大科技公司的招聘量势必增长。

巨头们在“纳新”上释放的积极信号给担心就业环境恶化的同学们打了一针强心剂。然而，近年来，巨头们的招聘门槛却从未降低。Amazon在大幅增加岗位数量的同时已经连年调高面试难度，“精英准入”的招聘原则似乎是顶级科技公司的共识。

三、面试形式变化

科技公司的面试发展到今天，一直在发生不同程度的演化和发展。微软推出的Alternative Interview Framework可以说颠覆了很多同学对现有面试模式的认知。在Alternative Interview Framework中，面试者会被提前告知面试题目；面试提出的是团队目前正在解决的一个实际问题；为求职者提供了与团队“相同”的数据访问权限；面试官与求职者一起互动；并且，只有在面试所有流程进行完的情况下，面试官才能给出反馈，避免在中间环节面试官对求职者反馈影响其他面试官。

在技术面试中，公司越发注重求职者的实际问题解决能力。这种新型面试方法在一定程度上解决了这个难题。在业界引起讨论，甚至有人预言其他巨头公司也会纷纷效仿微软，启动该面试模式，但该面试模式虽然在一定程度上让面试更具有实际意义，但是面试成本过高，所需时间过长。所以短时间内，科技公司针对计算机工程师的面试，不会转换成这种模式。

不过可以预见的是，技术面试也将越来越重视求职者的表达能力和交流能力，这一点在Facebook的招聘中体现得尤为突出。据内部HR透露，Facebook去年的秋招面试中，读过美本的同学，在表达能力方面比较突出，更容易通过面试。

四.招聘政策变化

2018年，在特朗普的指引下，美国移民局与国土安全部两大机构强强联手，公布了《2019年美国移民改革重点规划》，其主要政策有：

 1.  改变H1-B抽签规则；

 2.  限制F-1停留时间；

 3.  取消H-4工作机会；

 4.  指定EB-5投资区域；

 5.  加快绿卡处理时间；

 6.  明确划分B1、B2签证的区别等。

其中，对现阶段大多数同学产生直接影响的是第1条和第2条，预计生效时间是2019年8月。

第1条政策如果通过后开始实施，则会直接“提高H1-B发放门槛，只要“最优秀、聪明的外国人”，按照政策的具体规则，硕士毕业生抽签成功率预计会提升16%，而本科生想要通过H1-B留在美国则更加困难。

第2条政策给包括F1学生签证在内的这些非移民签证，设立一个在美国的最长停留时间。时间截止前，可以申请延期，但必须给出充足的理由以及比较具体的延长时间，否则会影响他们合法留美。

对于需要不断招聘计算机工程师的巨头公司来说，这样的移民政策算是条好消息，因此，各大公司的招聘政策也随之调整，对于国际学生或国际员工的招聘逐步提升，据内部消息，Facebook和Amazon的非中国区HR，也开始联系中国国内的在职优秀工程师，希望他们能够加入公司。

而对于学生而言，由于停留时间受到严格限制，尽早拿到offer才是最安全的方法。

虽然春招仍未结束，但距离秋招开始，只有4个月时间，如果可以选择，你会选择马上开始准备，在秋招职位刚刚发布就已经准备好投递并参加面试，还是等到秋招来临再临时抱佛脚呢？

Ultimate Frugal Living Tips and Hacks That Will SAVE You THOUSANDS of Dollars!

Here is the link.

Union find algorithm

March 26, 2019

Introduction

It is time for me to study lecture notes one more time. I like to take some notes and then find most challenging time complexity analysis, and then make my own notes as well.

Lecture notes

Here is the lecture notes from the university of princeton.edu.

I always confuse with quick find, quick union and union find. What are the differences? I worked on so many union find algorithm on Hackerrank.com, I should go back to review them and write code again.

Longest univalue path 

I asked the algorithm from 2018 to 2019 over 30 times on interviewing.io as a mock interviewer. I learn so many things over hundreds of interviwes last 365 days.

I like to work on union find algorithm and start to use the algorithm on mock interview as well. I started my first one with a senior developer in Sillicon Valley last night. I will continue to explore the algorithm, and learn together from interviewees on this most famous and applicable algorithm. It is so challenging and I could not be more happy to go for my weekly mock interviews.

Union find algorithm

I spent first twenty minutes to discuss with the interviwee last night. Since the interviewee could not relate to union find algorithm at all. It is such great opportunities for us to explore together how to solve the problem. What issues we have and we worked together the basics.

I like to master the algorithm. I already brought so many resources to help me master the algorithm, but I still could not make it this March 2019.

Here are facts:

1. I played hackerrank contest over 20 contests, won gold/ sliver/ bronze medal, a lot of times I had to work on graph algorithm, Krusal algorithm, minimum spanning tree;
2. I worked with my ex-coach last May over 100 minutes, I paid $100 Canada dollars for coaching session.
3. I worked on multiple algorithms tagged union find on leetcode.com. Here is the image.

Look for challenging activities

March 26, 2019

Introduction

It is my idea to make today so special, I like to from 11:00 PM to 12:00, just after 45 minutes mock interview on interviewing.io. I like to make this hour special.

Searching the ideas

I like to try to find some ideas how to improve my coding skills and also problem solving skills.

Find 20 hard level algorithms to work on

March 26, 2019

Introduction

It is not easy to find time to write code every day. Specially in normal business hour. How do I manage myself better and then I can have passion to code every day.

One hard algorithm a day

It is a good idea to work on one hard algorithm a day. I should try to solve all Leetcode weekly contest hard level algorithms, and then choose to study top 10 player and their solutions.

I took long break from Nov. 2018 to March 2019. I like to go back to old routine, work on algorithm problem solving every day.

Learn from the best

It is one of Amazon leadership principle. Hire the best.

To work on algorithm problem solving, I should choose best players and learn from their solution through weekly contest.

Github: Coaching from Tsinghua

March 26, 2019

Introduction

It is important for me to stay organized. I hired a private coach in May 2018 and also all sessions are documented in the github repository. I like to review the repository and look into union find algorithm again.

Coaching from Tsinghua

Here is the repository.

Github repository: 100 hard level algorithm 2018 summer campaign

March 26, 2019

Introduction

It is the repository I created called 100 hard level algorithm 2018 summer campaign. I like to review the repository and start to work on those 100 hard level algorithms again.

Hard level algorithms

I spent time to work on personal finance research, and only played weekly contest last 5 months. I only worked on hard level algorithms a few times after the contest. Now I plan to push myself to work more on hard level algorithms.

Here is the repository on github.com.

Personal finance research

March 25, 2019

Introduction

It is such great journey to work on personal finance research from Nov. 2018 to March 2019. I do have a great break from data structure and algorithm practice.

Daniel Kahneman: "Thinking, Fast and Slow" | Talks at Google

Here is the link.

Daniel Kahneman

Here is the link.

In 2011, he was named by Foreign Policy magazine to its list of top global thinkers.^[2] In the same year, his book Thinking, Fast and Slow, which summarizes much of his research, was published and became a best seller.^[3]

In 2015, The Economist listed him as the seventh most influential economist in the world.^[5]

THINKING, FAST AND SLOW BY DANIEL KAHNEMAN | ANIMATED BOOK REVIEW

Here is the link.

THINKING, FAST AND SLOW BY DANIEL KAHNEMAN | ANIMATED BOOK REVIEW

Here is the link.

How to STOP WASTING Money | How to Save Money Tips

Here is the link.

Lifestyle Creep - Are You Making This HUGE Financial Mistake? | Money Mistakes to Avoid

Here is the link.

Naomi Osaka Press Conference | 2019 Miami Open Third Round

Here is the link.

Why Naomi Osaka Split With Coach Sascha Bajin

Here is the link.

I want the benefit of tennis sports fan

March 24, 2019

Introduction

I have to push myself to play more tennis and get enough physical exercise, specially working on my right arm and whole body. One idea is to study tennis players and their coaches.

Naomi Osaka

Here is the video I started to follow.

Discipline and hard work, and also make it light and fun.

Kim Scott | Radical Candor: How to Be a Better Boss | RocketSpace Speaker Series

Here is the link.

Former Googler Lets Us In On The Surprising Secret To Being A Good Boss

Here is the link.

The single most important thing a boss can do, Scott has learned, is focus on guidance: giving it, receiving it, and encouraging it. Guidance, which is fundamentally just praise and criticism, is usually called “feedback,” but feedback is screechy and makes us want to put our hands over our ears. Guidance is something most of us long for.

Culture, Candor & More | Kim Scott

Here is the link.

Radical Candor — The Surprising Secret to Being a Good Boss

Here is the article's link.

Radical Candor — The Surprising Secret to Being a Good Boss | First Round Review

Here is the link.

How former Google and Apple exec Kim Scott is curing the world of horrible bosses

Here is the article's link.

Book review: Radical candor

Desmond Zhou recommended the book on March 22, 2019. I like to spend time to learn from the book.

Here is 8 minutes book review.

Case study: IBM project development study

March 24, 2019

Introduction

I do not know too much the topic I write. I like to spend 10 to 20 minutes to compare the project management flow chart with Amazon.

Case study

 boss                         boss                  boss

   |                                 |                        |

 \ |/                              \ |/                    \ | /

System analyst -> engineer -> test engineer ->

How to read my Leetcode profile?

March 24, 2019

Introduction

It is my personal finance research. As a matter of fact, Amazon Vancouver finds candidates from China, Latin America since they search talents globally. I stayed in USA from 1996 to 2010, I stayed in Canada from 2010 to 2019. I also have to learn how to push myself by working with talents all over the world. Today I like to work on a short research how to read my Leetcode profile?

My Leetcode profile

Here is my leetcode profile on March 24, 2019.

I like to define the time line 5 spots:

May 2018 - Time line 1,
July 2018 - Time line 2
August 2018 - Time line 3
November 2018 - Time line 4
March 2019 - Time line 5

I like to write a few things for each time line, how I advance myself to next level, change target, analyze my own career and thinking process, Amazon leadership principle etc.

May 2018 - Time line 1

I finally decided to take risk and take one week vacation to SJTU 30 years reunion in Shanghai. I booked the flight and in the airport I got a message from LinkedIn.com from one Amazon recruiter.

Here is the blog. I had to book a phone screen after the vacation. I did book a phone screen in May and I passed the phone screen. I have two weeks to prepare an onsite in June in the city of Seattle. I hired a coach from Tsinghua university, a young graduate student met on pramp.com in January 2018. He solved over 500 algorithms, his ranking is around 5000.

I was told to work on easy level algorithms on leetcode.com. But I believe that I should learn how to solve hard level algorithms only. Coach told me a few times, work on easy level algorithms. I did not have time to work on easy level algorithms, two weeks preparation, full time job.

So the fact is that I only solved 120 algorithms from January 2015 to May 2018. And also I did not organize, write discussion panel or document the practice very well. So there is a lot of blank before May 2018.

June 2018 - Time line 2

After I went to Amazon onsite, I had a facebook phone screen set up before August 1. I continued to work on Leetcode easy level algorithms.

November 2018 - Time line 3

I have to wait another two years before I can apply Amazon. I decided to work on personal finance research. I like to do some research to solve real problems in my life. It is the first time I chose to work on personal finance research, it is painful experience since I reveal the real life of my personal finance.

March 2019 - Time line 4

I worked hundreds of hours on personal finance in holiday one week break last week of December 2018. I chose to continue to study personal finance. I only play Leetcode weekly contest.

Do not waste!

March 24, 2019

Introduction

It is my personal finance research. I am also a Christian, I like to be a good role model to other people. But I find out that I make huge mistakes and ignore the consequence of my actions.

Clothes

I just did calculate based on citi credit card, I spent over $6,000 us dollars from 1999 to 2001 over $6,000 us dollars on clothes. What are those clothes? Those are top brand clothes and bags. I paid my mom a condo in 2001 using $6,000 dollars, now it worth over $100,000 dollars.

I did go back in 2014 and threw away into community garbage can. It is not right things to do. I argued to myself to give more space to the renters. There is a cost to bring them back to Canada; There is cost for me to sell them one by one online or donation etc.

$40,000 credit card expense

I spent $40,000 us dollars on my citi credit card from 1999 to 2001. I bought a lot of stuff and put into a two bedroom condo.

I do not set up inventory check for those items. I do not track each item expenses, invoice, picture, usage. I just gave away, or throw away. I did analyze those cost this January 2019 finally based on citi bank credit card. It is not correct behavior.

I should think about and analyze, and make things better.

I bought extra video camera, I only played a few times. I just left inside condo. I should bring those item to Canada, I can use them record video and post some algorithm and personal finance video on youtube.com.

I did a case study on clothing sofa purchased with my mom together back in 2000.

I got a friend on Leetcode.com

March 24, 2019

Introduction

It is my personal finance research. I play Leetcode weekly contest, and also I write for weekly contest discussion as well. I played over 35 contests, and then I found out that I got a friend.

Who is this anonymous friend?

I need to get involved into the community to leetcode discuss. It is not easy to work with day in and day out. I know that my time is limited resource, I write things too quick and I constantly make changes. For example, I got down votes multiple times, so I take the approach. I  just delete the post, and think about problems shown in the post, and then I write one to make it better.

Now I have a friend who also writes very well. We give each other upvotes to build a better community around our circles.

Here is one of discussion links. Here is Leetcode profile. He is moving towards ranking 10,000, and I also like to push myself hard to move into ranking before 10,000.

He wrote a popular post with 14 upvotes. He got 8 comments. His ranking is 12589.

Let us record my statistics here. I will check update after three months.

I got upvotes from the friend, and also the comment from him only. But his circle has a lot more good players.

weekly contest 129

March 24, 2019

Introduction

It is my favorite weekly contest. I played the contest and wrote the two algorithms, and I had some problem with integer max value related to algorithm II, and then I came out brute force solution to solve algorithm IV but I could not find time to write.

My performance

Here is the my ranking with problems solved.

I posted the question just after the contest related to second algorithm, here is the link.

1020 Partition array into three parts with equal sum, here is my discussion link.
1021 best seen pairs, here is my discussion link.

Dalbar Inc

March 23, 2019

Here is the link.

Spectrem group

Here is the website.

104 - 13789 107a Avenue

Surrey, Whalley

• 1 Bed
• 1 Bath
• 544 sqft

$298,000

Added 5 days ago

Type

Apartment/Condo

Style

1 Storey

Size

544 sqft

Year Built

2010

Pets

Contact Us

Taxes

$907 /yr

Strata Fees

$267 /mo

Walk Score

81

MLS®#

R2349460

Days on Site

5

Listed By

Pospischil Realty Group

Last Checked

13 minutes ago

Last Updated

19 hours ago

Added to Zolo

Mar 18, 2019

217 - 10221 133A St

$279,900

Est. Mortgage $1269.71/mo  

1 bed|1 bath|678 sqft|condo

Date Listed: Tue, Mar 19, 2019

Property Tax: $973 (2018)

Property Description

INVESTOR ALERT: A conveniently located and RENTABLE 1 bed, 1 bath (678 sf) condo in Whalley one block away from SFU Surrey campus. An efficient and cozy floor plan that comes with 1 parking and 1 locker. It is situated close to shopping, recreation, restaurants, parks, schools, services, and transit. It is within walking distance to Surrey Central Skytrain Station, Surrey City Hall, and Surrey Public Library. Pets are not allowed and rentals are allowed. 2 open houses Sat Mar 23 from 1:30-2:30 pm & Sun Mar 24 from 2:30-3:30 pm.

Details

Property Type: Condo

Property Tax: $973 (2018)

Fees: $216

Last Updated: Thu, March 21, 2019

Community: Whalley

Title: Freehold Strata

Top Investing Lessons You Need To Learn From Warren Buffet

Here is the link.

2:12/ 33:08
Lesson 1:
Do not let short term swing to affect your decision making.


Buy good stuff, do not pay much

Risk tolerance, risk capacity

Rational people do not risk what they have to get what they do not need.

Investing Won't Make You Rich (Probably)

Here is the link.

Investment will not make your rich

Point #1
You need money to

SpectremGroup value of the investor

Point #2

S&P500
9.8% last 10 years

For example, 10,000 dollars to invest, 9.8% return, it will take 51 years to get a million dollars. If you start from 15 years, you will get 66 years old.

$10,000 dollar invest, get 1 million in 10 years, annual return ~59%; you need to get those picks to get high return.

Point #3

6:44/ 13:47
Dalbar
S&P500: 7.68%
    Funds: 4.79%

7:25/ 13:47
Dalbar analyzed three factors:
- Capital not available to invest
- Capital needed for other purposes
- Psychological factors

Retention rate:
3.8 years

Loss aversion bias:
we worry about losing more money when price goes down.

Anchoring bias

Herding
Follow the decisions of other people

Regret aversion

11:30/ 13:47
Program educated or simple strategy

Rules of Wealth: 5 Personal Finance Fundamentals for Building Wealth From Scratch

Here is the link.

Fundamental #3:

Live frugally, not cheap

. Maximize Every dollar: What are they worth to you?
- Needs v. Wants
- Quality v. Quantity
- Spend from your abundance, not your first fruits

. 10 Second Rule: Do you really need it?
. Decide strategically what you love and what you don't and spend accordingly

. This is how the Wealthy are able to happily live below their means with a mountain of cash in the bank

Fundamental #4:

Manage your money

. Use your GAP MONEY to buy assets that will build a stable future for you and your family. But first...
- Pay off ALL high interest debt
- Build an emergency fund up to $1,000
- Pay off All debts
- Bump emergency fund up to $5,000
- Use your GAP MONEY to invest in assets that pay you now for retirement, kids college, major purchases, etc.

Key monthly activities
- analyze your data for improvement
- Monitor your credit scores & credit report

Making these activities a priority will help you end each month with more cash and less stress

Fundamental #5:

Control your destiny
. The game of wealth is not about being rich, it's all about FREEDOM!
- Not being beholden to others
- Be in a position to call the shots

It takes a lot of time, effort, money, confidence and drive to climb to the top of the financial mountain, but the air up there is the best there is!

Weekly contest progress report

March 21, 2019

Introduction

It is my favorite weekly contest on Leetcode.com. I also learn a few things after 24 contests since last September. I like to write down a progress report to show my progress.

Progress report

Last week I played weekly contest 128. This is the first time I experienced something new. I chose to study those top ranking 195 players and their solution to solve Leetcode 1015 hard level algorithm.

It is hard for me to learn so many ideas to solve the problem in a few hours. But after two days study, I started to break through and learn how to solve the algorithm from top five players first.

Top ranking 15 players uses less than 30 minutes to solve all four algorithms. The fact just reminds me to stay humble and continue to push myself to learn.

I also review top player's code and see what I should learn from those top performers in the world.

25 Habits of Frugal People

Here is the link.

7 Daily Frugal Habits That Save a LOT of Money

Here is the link.

6 habits of successful investors

Here is the link.

Consumer vs. Investor Mindset

Here is the link.

The difference is the same between the rich & poor. The rich think long-term and the poor think about the next day. Hence, living paycheck to paycheck.

When you are thinking long-term the first realization is this asset (iPhone) will not provide a monetary Return On Investment (ROI). Preferably the next thought that races in are the money spent on the iPhone could be better invested elsewhere. 

Hopefully, you are starting to see the bigger picture on the differences of a consumer & investor thought process. When you adopt the investor mindset you literally start analyzing every extra purchase. Not just with the new iPhone but other consumer products as well. Consider the larger purchases you will have later in life such as a vehicle or home. I have seen people purchase past beyond their means which limits your investing power by thousands of dollars in a lifetime.

How to Tell If You're Cheap or Frugal

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20 habits of frugal people

Here is the link.

1. Frugal people prepare food from scratch.
2. Frugal people always have a meal plan.
3. Frugal people use every drop.
4. Frugal people shop second-hand
5. Frugal people value quality and reliability.
6. Frugal people repair before replacing. 
7. Frugal people are low maintenance. 
8. Frugal people stay home. 
9. Frugal people take advantage of community resources.
10. Frugal people live in smaller houses. 
11. Frugal people have like-minded friends.
12. Frugal people are always learning about money. 
13. Frugal people think long-term.
14. Frugal people live within their means. 
15. Frugal people give their children less stuff.
16. Frugal people do low-cost exercise. 
17. Frugal people don't feel a need to upgrade technology.
18. Frugal people never buy new cars. 
19.  Frugal people buy in bulk. 
20. Frugal people are less stressed. 

How to Create Passive Income - Rich Dad Poor Dad by Robert Kiyosaki Animated

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Hay fever sufferings second year

March 19, 2019

Introduction

I started to experience the sufferings of hay fever again more than one week ago. Last night, my eye was so itching, I could not stopping rubbing, and so many problems and I could not tell what is going on. I believe that I start to have a hay fever again in second year.

Learn hay fever

I need to document my experience and figure out how I can learn from the experience.