Solving CSES Problemset [12 Hour Livestream] [150 coding problems]

I'm attempting to solve the first 150 problems of the CSES Problem Set (in 12 hours?) live.
I will try to use no prewritten templates, but maybe some Wikipedia?
Also, this happens to be my 100k sub special.

Solved everything in a bit under 11 hours, played Typeracer and answered a few questions for the last hour :P
The timer was accidentally reset 2 times during the stream

[AbhishekSingh-cdyc]

Time stamp for each problem (HAPPY CODING :)
Introductory Problems
Weird Algorithm 2:15
Missing Number 4:49
Repetitions 5:52
Increasing Array 7:09
Permutations 8:44
Number Spiral 12:10
Two Knights 18:20
Two Sets 20:05
Bit Strings 25:29
Trailing Zeros 26:35
Coin Piles 28:03
Palindrome Reorder 30:09
Creating Strings I 32:51
Apple Division 34:35
Chessboard and Queens 37:18
Grid Paths 40:40 -> 10:06:13

Sorting and Searching

Distinct Numbers 50:48
Apartments 52:53
Ferris Wheel 55:10
Concert Tickets 57:16
Restaurant Customers 59:48
Movie Festival 1:01:50
Sum of Two Values 1:03:23
Maximum Subarray Sum 1:04:46
Stick Lengths 1:06:23
Playlist 1:07:27
Towers 1:08:59
Traffic Lights 1:11:37
Room Allocation 1:14:31
Factory Machines 1:18:28
Tasks and Deadlines 1:25:14
Reading Books 1:27:11
Sum of Three Values 1:28:48
Sum of Four Values 1:32:38 -> 1:40:50
Nearest Smaller Values 1:39:00
Subarray Sums I 1:41:06
Subarray Sums II 1:42:43
Subarray Divisibility 1:43:09
Array Division 1:44:14
Sliding Median 1:47:08
Sliding Cost 1:55:25
Movie Festival II 1:58:02
Maximum Subarray Sum II 2:01:38

dp problem

Dice Combinations 2:05:11
Minimizing Coins 2:06:23
Coin Combinations I 2:07:53
Coin Combinations II 2:10:07
Removing Digits 2:10:59
Grid Paths 2:12:37
Book Shop 2:16:03
Array Description 2:19:25
Edit Distance 2:22:28
Rectangle Cutting 2:25:59
Money Sums 2:28:43
Removal Game 2:31:12
Two Sets II 2:35:01
Increasing Subsequence 2:37:56
Projects 2:41:24

Graph Algorithms

Counting Rooms 2:45:24
Labyrinth 2:47:33
Building Roads 2:54:33
Message Route 2:56:49
Building Teams 2:59:32
Round Trip 3:01:48
Monsters 3:05:03
Shortest Routes I 3:13:17
Shortest Routes II 3:17:33
High Score 3:22:05
Flight Discount 3:25:59
Cycle Finding 3:35:03
Flight Routes 3:54:35
Round Trip II 3:59:52
Course Schedule 4:03:44
Longest Flight Route 4:05:12
Game Routes 4:08:43
Investigation 4:09:46
Planets Queries I 4:16:41
Planets Queries II 4:18:23 // 4:21:23
Planets Cycles 4:31:40
Road Reparation 4:32:50
Road Construction 4:35:48
Flight Routes Check 4:38:07
Planets and Kingdoms 4:44:14
Giant Pizza 4:45:52
Coin Collector 4:57:06
Mail Delivery 5:00:57
De Bruijn Sequence 5:09:57
Teleporters Path 5:15:01
Hamiltonian Flights 5:19:38
Knight's Tour 5:27:49
Download Speed 5:38:19
Police Chase 5:45:27
School Dance 5:51:23
Distinct Routes 5:55:38

Range Queries

Range Sum Queries I 6:13:56
Range Minimum Queries I 6:15:14
Range Sum Queries II 6:18:30
Range Minimum Queries II 6:21:36
Range Xor Queries 6:22:31
Range Update Queries 6:23:35
Forest Queries 6:27:30
Hotel Queries 6:30:04
List Removals 6:41:11
Salary Queries 6:45:21
Subarray Sum Queries 6:48:59
Distinct Values Queries 6:53:12
Forest Queries II 6:57:38
Range Updates and Sums 7:01:34
Polynomial Queries 7:05:41
Range Queries and Copies 7:10:10 -> 9:21:16

Tree Algorithms

Subordinates 7:11:17
Tree Matching 7:12:54
Tree Diameter 7:16:40
Tree Distances I 7:17:55
Tree Distances II 7:21:43
Company Queries I 7:24:07
Company Queries II 7:26:43
Distance Queries 7:28:40
Counting Paths 7:29:49
Subtree Queries 7:33:45
Path Queries 7:36:05
Distinct Colors 7:38:30

Mathematics

Exponentiation 7:46:51
Exponentiation II 7:48:13
Counting Divisors 7:49:08
Common Divisors 7:52:25
Sum of Divisors 7:54:38
Binomial Coefficients 7:56:55
Creating Strings II 8:02:30
Distributing Apples 8:03:54
Christmas Party 8:05:13
Fibonacci Numbers 8:08:22
Throwing Dice 8:17:48
Graph Paths I 8:19:49
Graph Paths II 8:23:06
Dice Probability 8:28:31
Moving Robots 8:35:52
Candy Lottery 8:41:01
Inversion Probability 8:43:38
Stick Game 8:46:04
Nim Game I 8:47:48
Nim Game II 8:48:52
Stair Game 8:49:47 -> 10:07:15

String Algorithms

Word Combinations 8:56:28
String Matching 9:09:36
Finding Borders 9:30:10
Finding Periods 9:37:02
Minimal Rotation 9:48:30
Longest Palindrome 9:41:58
Required Substring 9:12:48

[ganeshprem]

This guy's 1 TB homework file is actually homework.

[BhveshRana]

William : solving 150 problems in 12 hours
Me : solving 12 problems in 150 hours

[mateuszjacniacki]

After watching part of the stream I was inspired to take similar challenge. I started solving CSES problems one after another and by the end of the first day I solved first 14 introductory problems. Then I slowed down but still managed to solve at least one problem a day. After a month I solved 147/150 tasks (skipped three math related problems). Now I see how hard it was for him to solve this in less than 11 hours it's unbelievable!

[sushant_]

This man takes minutes of break while me here is still on break that I took in 2012 :/

[King-mesk]

The only thing i could do for 12 hours straight is sleep.

[somtovitus]

This guy starts dabbing keyboard before I even finish reading the question.

[tmwilliamlin]

The video has not finished rendering yet, so so far only 2 hours are available.
Edit: it has been finished.

[AlayDhagia]

it really hurts when you spend almost a day on a question and still cannot find a solution but William calls it a trivial question :(

[chaos]

One thing that I learned from you is that when you are solving the problem, you first come up with the big picture rather than jumping into detail parts.

[techdoseu]

You are a symbol of hard work & dedication :-) This is very motivating for us.

[somtovitus]

"Do what you love".

I can't find any better definition to this quote than this video.

[brandall]

I like how the title is 12 hour livestream... but it actually takes him 10 hours.

[nithingowda]

Thanks a lot for this stream sir. We all really appreciate it, take your time and upload the full video.

[RafaelToscano]

The mental fortitude to sit for 12 hours solving so many problems is impressive.

[gachalusaxxx.]

I loved this 12-hour stream, it inspired me to solve my coding problems as well. Please keep doing more.🙂

[temphemp]

This guy could destroy any technical interview LOL

[Ptoq.]

Me : I will solve cses 150 problems in this year! Come with me william?

William : Sorry, yesterday already I solved all of that

Me : ??

[junioroblitas]

Incredible! I think you should write a book about CP. Foundations, strategies, tricks, and the way on what you improve your skills and your route map.

[bibekdhkl]

Most dedicated and focused high school student i have ever seen😎