Coding Challenge 162: Self-Avoiding Walk

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Published on June 10, 2021 7:01:37 PM ● Video Link: https://www.youtube.com/watch?v=m6-cm6GZ1iw

Duration: 38:27

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It's finally time to attempt a Self-Avoiding Walk! In this video, I quickly visualize a simple JavaScript p5.js implementation of a self-avoiding walk. I then tackle the more complex problem of backtracking to find a solution to a space-filling self-avoiding walk. https://thecodingtrain.com/challenges/162-self-avoiding-walk

p5.js Web Editor Sketches:
🕹️ Basic Self Avoiding Walk: https://editor.p5js.org/codingtrain/sketches/2_4gyDD_9
🕹️ Self Avoiding Walk with Backtracking: https://editor.p5js.org/codingtrain/sketches/dRWS3A9nq
🕹️ Self Avoiding Walk 3D: https://editor.p5js.org/codingtrain/sketches/D0ONOlCDT
🕹️ Self Avoiding Walk with Bezier: https://editor.p5js.org/codingtrain/sketches/KFbX0NWgh
🕹️ Self Avoiding Walk with Recursion: https://editor.p5js.org/codingtrain/sketches/UPxBk1YiB
🕹️ Random Walk with Alpha: https://editor.p5js.org/codingtrain/sketches/IEw2RkDnJ

🎥 Previous video: https://youtu.be/EvS_a921dBo?list=PLRqwX-V7Uu6ZiZxtDDRCi6uhfTH4FilpH
🎥 All videos: https://www.youtube.com/playlist?list=PLRqwX-V7Uu6ZiZxtDDRCi6uhfTH4FilpH

Links discussed in this video:
🔗 Self Avoiding Walk (Wikipedia): https://en.wikipedia.org/wiki/Self-avoiding_walk
🔗 The complexity of counting self-avoiding walks in subgraphs of two-dimensional grids and hypercubes: https://www.sciencedirect.com/science/article/pii/S030439750300080X
🔗 The pivot algorithm: A highly efficient Monte Carlo method for the self-avoiding walk (sci-hub): https://sci-hub.st/10.1007/bf01022990

Other videos mentioned in this video:
🎥 Random Walker - Coding Challenge 52: https://youtu.be/l__fEY1xanY
🎥 Minesweeper - Coding Challenge 71: https://youtu.be/LFU5ZlrR21E
🎥 filter() - Array Functions: https://youtu.be/qmnH5MT_luk
🎥 Maze Generator - Coding Challenge 10: https://youtu.be/HyK_Q5rrcr4
🎥 Recursion - Coding Train 77: https://youtu.be/jPsZwrV9ld0
🎥 A* Pathfinding Algorithm - Coding Challenge 51: https://youtu.be/aKYlikFAV4k
🎥 3D Self Avoiding Walk - Coding Train Live (May 27, 2021): https://youtu.be/jlK1SJr-FBc?t=4353

Timestamps:
0:00 Choo choo! Welcome!
1:05 Explain! How can we go about this?
2:29 Code! Let's add a visited grid.
6:25 Code! What are the options for movement now?
10:34 Code! Let's check the edges.
12:34 I could stop here but wait.
13:30 Explain! How can we think about backtracking?
15:15 Code! Let's make a spot class and a path variable.
24:23 Code! Now backtracking!
29:38 Whoops! Copying allOptions was a mistake.
31:19 Code! Maybe we need an end condition.
32:09 Yay! It worked.
32:22 This could take awhile. Could it be improved?

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🎥 Coding Challenges: https://www.youtube.com/playlist?list=PLRqwX-V7Uu6ZiZxtDDRCi6uhfTH4FilpH
🎥 Intro to Programming: https://www.youtube.com/playlist?list=PLRqwX-V7Uu6Zy51Q-x9tMWIv9cueOFTFA

🔗 p5.js: https://p5js.org
🔗 p5.js Web Editor: https://editor.p5js.org/
🔗 Processing: https://processing.org

📄 Code of Conduct: https://github.com/CodingTrain/Code-of-Conduct

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