APL Quest

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APL Quest is the title applied to the collection of phase 1 problems from the 2013–2023 APL Problem Solving Competition rounds, and to the associated live chat sessions, sample solutions[1] and video follow-ups.[2] The problem texts were written by Brian Becker[3] and the chat events were held by Adám Brudzewsky (who also recorded the videos) with guest appearances by Richard Park, from 4 February 2022 until 8 March 2024. The problems are available online as a learning resource, complete with automatic validation of solutions.[4]

Still frame from a follow-up video.

Sessions

Problems from 2013

Problem Title Chat Code Video*
1 Seems a Bit Odd To Me Feb 4, 2022 2013/1.apl 00:10:31
2 Making The Grade Feb 11, 2022 2013/2.apl 00:15:03
3 What Is In a Word Feb 18, 2022 2013/3.apl 00:21:18
4 Keeping Things In Balance Feb 25, 2022 2013/4.apl 00:34:35
5 Identity Crisis Mar 4, 2022 2013/5.apl 00:25:05
6 Home On The Range Mar 11, 2022 2013/6.apl 00:19:48
7 Float Your Boat Mar 18, 2022 2013/7.apl 00:22:50
8 Go Forth And Multiply Mar 25, 2022 2013/8.apl 00:19:42
9 It Is a Moving Experience Apr 1, 2022 2013/9.apl 00:15:12
10 Solution Salvation Apr 8, 2022 2013/10.apl 00:24:01
* All videos are also available as a single playlist.

Problems from 2014

Problem Title Chat Code Video*
1 It Is All Right Apr 15, 2022 2014/1.apl 00:18:13
2 How Tweet It Is Apr 22, 2022 2014/2.apl 00:29:50
3 Tell a Fib Apr 29, 2022 2014/3.apl 00:30:45
4 Space The Final Frontier May 6, 2022 2014/4.apl 00:52:55
5 Mirror Mirror May 13, 2022 2014/5.apl 00:16:31
6 Roll The Dice May 20, 2022 2014/6.apl 00:10:55
7 Revolutionary Thinking May 27, 2022 2014/7.apl 00:15:56
8 Go The Distance Jun 3, 2022 2014/8.apl 00:07:59
9 Going Ballistic Jun 10, 2022 2014/9.apl 00:08:27
10 Sales Are Up Jun 17, 2022 2014/10.apl 00:10:59
* All videos are also available as a single playlist.

Problems from 2015

Problem Title Chat Code Video*
1 Nag A Ram Jun 23, 2022 2015/1.apl 00:16:22
2 Longest Streak Jul 1, 2022 2015/2.apl 00:14:49
3 Farey Tale Jul 8, 2022 2015/3.apl 00:31:35
4 PDI - Progressive Dyadic Iota Jul 15, 2022 2015/4.apl 00:35:10
5 He’s so mean, he has no standard deviation Jul 22, 2022 2015/5.apl 00:07:47
6 Hey! This is My Space Jul 29, 2022 2015/6.apl 00:24:00
7 Just in (Upper) Case Aug 5, 2022 2015/7.apl 00:05:50
8 Unlucky 13 Aug 12, 2022 2015/8.apl 00:13:47
9 I’d Like Mine Scrambled Please Aug 19, 2022 2015/9.apl 00:23:31
10 Blaise’ing a Trail Aug 26, 2022 2015/10.apl 00:16:46
* All videos are also available as a single playlist.

Problems from 2016

Problem Title Chat Code Video*
1 Statistics - Mean Sep 2, 2022 2016/1.apl 00:17:48
2 Statistics - Median Sep, 9, 2022 2016/2.apl 00:23:22
3 Statistics - Mode Sep, 16, 2022 2016/3.apl 00:26:36
4 Just Meshing Around Sep, 23, 2022 2016/4.apl 00:12:07
5 You’re Unique, Just Like Everyone Else Sep, 30, 2022 2016/5.apl 00:13:36
6 Shorter Ones to the Front Oct, 7, 2022 2016/6.apl 00:04:19
7 3s and 5s Oct, 14, 2022 2016/7.apl 00:06:28
8 Separating Out the Negative Oct, 21, 2022 2016/8.apl 00:07:16
9 Delimited Text Oct, 28, 2022 2016/9.apl 00:06:51
10 Order Total Nov, 4, 2022 2016/10.apl 00:06:43
* All videos are also available as a single playlist.

Problems from 2017

Problem Title Chat Code Video*
1 What an Odd Bunch Nov 11, 2022 2017/1.apl 00:03:10
2 Good Evening Nov 18, 2022 2017/2.apl 00:04:56
3 Miss Quoted Nov 25, 2022 2017/3.apl 00:17:04
4 Slice(s) of Pie(s) Dec 2, 2022 2017/4.apl 00:12:35
5 DNA? Dec 9, 2022 2017/5.apl 00:03:54
6 k-mers Dec 16, 2022 2017/6.apl 00:08:54
7 Counting DNA Nucleotides Dec 23, 2022 2017/7.apl 00:06:53
8 Be the First 1 Dec 30, 2022 2017/8.apl 00:14:10
9 Double Trouble Jan 6, 2023 2017/9.apl 00:10:35
10 Squaring Off Jan 13, 2023 2017/10.apl 00:05:38
* All videos are also available as a single playlist.

Problems from 2018

Problem Title Chat Code Video*
1 Oh Say Can You See Jan 20, 2023 2018/1.apl 00:13:48
2 Number Splitting Jan 27, 2023 2018/2.apl 00:06:16
3 Rolling Along Feb 3, 2023 2018/3.apl 00:13:03
4 Whats Your Sign Feb 10, 2023 2018/4.apl 00:13:40
5 Whats Your Sign Revisited Feb 17, 2023 2018/5.apl 00:15:18
6 Whats Your Angle Feb 24, 2023 2018/6.apl 00:07:09
7 Unconditionally Shifty Mar 3, 2023 2018/7.apl 00:07:45
8 Making a Good Argument Mar 10, 2023 2018/8.apl 00:12:41
9 Earlier Later or the Same Mar 17, 2023 2018/9.apl 00:05:29
10 Anagrammatically Correct Mar 24, 2023 2018/10.apl 00:03:12
* All videos are also available as a single playlist.

Problems from 2019

Problem Title Chat Code Video*
1 Chunky Monkey Mar 31, 2023 2019/1.apl 00:05:32
2 Making the Grade Apr 7, 2023 2019/2.apl 00:03:27
3 Grade Distribution Apr 14, 2023 2019/3.apl 00:09:00
4 Knight Moves Apr 21, 2023 2019/4.apl 00:06:37
5 Doubling Up Apr 28, 2023 2019/5.apl 00:05:01
6 Telephone Names May 5, 2023 2019/6.apl 00:08:23
7 In the Center of It All May 12, 2023 2019/7.apl 00:06:56
8 Going the Distance May 19, 2023 2019/8.apl 00:15:47
9 Area Code à la Gauss May 26, 2023 2019/9.apl 00:12:57
10 Odd and Evens Jun 2, 2023 2019/10.apl 00:15:33
* All videos are also available as a single playlist.

Problems from 2020

Problem Title Chat Code Video*
1 Let's Split Jun 9, 2023 2020/1.apl 00:06:11
2 Character Building Jun 16, 2023 2020/2.apl 00:13:05
3 Excel-lent Columns Jun 23, 2023 2020/3.apl 00:06:19
4 Take a Leap Jun 30, 2023 2020/4.apl 00:11:04
5 Stepping in the Proper Direction Jul 7, 2023 2020/5.apl 00:11:17
6 Move to the Front Jul 14, 2023 2020/6.apl 00:05:04
7 See You in a Bit Jul 21, 2023 2020/7.apl 00:07:02
8 Zigzag Numbers Jul 28, 2023 2020/8.apl 00:10:57
9 Rise and Fall Aug 4, 2023 2020/9.apl 00:07:49
10 Stacking It Up Aug 11, 2023 2020/10.apl 00:11:09
* All videos are also available as a single playlist.

Problems from 2021

Problem Title Chat Code Video*
1 Are You a Bacteria Aug 18, 2023 2021/1.apl 00:02:31
2 Index Of Modified Aug 25, 2023 2021/2.apl 00:06:36
3 Multiplicity Sep 1, 2023 2021/3.apl 00:10:00
4 Square Peg, Round Hole Sep 8, 2023 2021/4.apl 00:07:39
5 Rect-ify Sep 15, 2023 2021/5.apl 00:05:02
6 Fischer Random Chess Sep 22, 2023 2021/6.apl 00:03:20
7 Can You Feel the Magic Sep 29, 2023 2021/7.apl 00:07:41
8 Time to Make a Difference Oct 6, 2023 2021/8.apl 00:02:57
9 In the Long Run Oct 13, 2023 2021/9.apl 00:07:19
10 On the Right Side Oct 20, 2023 2021/10.apl 00:12:25
* All videos are also available as a single playlist.

Problems from 2022

Problem Title Chat Code Video*
1 Counting DNA Nucleotides? Oct 28, 2023 2022/1.apl 00:04:10
2 Attack of the Mutations! Nov 4, 2023 2022/2.apl 00:04:07
3 Uniquely Qualified Nov 11, 2023 2022/3.apl 00:06:17
4 In the Long One… Nov 18, 2023 2022/4.apl 00:11:08
5 Stairway to Heaven Nov 25, 2023 2022/5.apl 00:21:09
6 Pyramid Scheme Dec 2, 2023 2022/6.apl 00:03:14
7 Just Golfing Around Dec 9, 2023 2022/7.apl 00:16:52
8 Let’s Split! Dec 16, 2023 2022/8.apl 00:10:08
9 An Average Window (or a Windowed Average) Dec 23, 2023 2022/9.apl 00:06:29
10 Separation Anxiety Dec 30, 2023 2022/10.apl 00:09:17
* All videos are also available as a single playlist.


Problems from 2023

Problem Title Chat Code Video*
1 Elimination Sort Jan 5, 2024 2023/1.apl 00:03:56
2 Put It In Reverse Jan 12, 2024 2023/2.apl 00:05:58
3 Caesar Salad Jan 19, 2024 2023/3.apl 00:02:56
4 Like a Version Jan 26, 2024 2023/4.apl 00:09:15
5 Risky Business Feb 2, 2024 2023/5.apl 00:06:24
6 Key Value Pairs Feb 9, 2024 2023/6.apl 00:16:41
7 Lets Be Rational Feb 16, 2024 2023/7.apl 00:04:03
8 Critical Thinking Feb 23, 2024 2023/8.apl 00:08:22
9 Flipping Pairs Mar 1, 2024 2023/9.apl 00:24:47
10 Partition with a Twist Mar 8, 2024 2023/10.apl 00:10:17
* All videos are also available as a single playlist.

References

  1. ↑ Brudzewsky, Adám. apl_quest code repository. GitHub.
  2. ↑ Brudzewsky, Adám. APL Quest playlist. YouTube.
  3. ↑ Brudzewsky, Adám. The APL Quest Series. Dyalog Blog. March 15, 2024.
  4. ↑ APL Quest website.
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