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algorithms

Code challenge sites

• LeetCode
• Advent of Code
• HackerRank
• Codinggame
• Exercism
• Codewars
• Codeforces
• CodeFight
• SphereOnlineJudge
• TopCoder
• Project Euler

Code katas

• Pytudes

Algorithm repositories

• The Arcane Algorithm Archive
• Open Genus

Math

• Quaternions vs Rotors
• Difference between Big O, Big Omega, and Big Theta
• Distance Fields, coordinate fields, and marching parabolas

Machine learning

• The Illustrated Transformer

Computer Science

• Church-Turing Thesis Cannot Possibly Be True
  • Comments
• Oracle machine

Textbooks

• Principles of Algorithmic Problem Solving
• Category Theory for Programmers

Algorithms

• Stream processing and probabilistic methods: Data at scale
• Wallaroo Labs Blog
  • "Wallaroo Labs writes their technical posts to include just enough algorithm + paper links while writing in a fairly accessible language, so it doesn't completely fly over my head"
• Damn cool algorithms: Levenshtein automata

Data structures

• Zip Trees - Tarjan and Slides
• Masstree: A cache-friendly mashup of tries and B-trees

Interview Questions

• Google Interview Question Deconstructed: The Knight's Dialer
  • Reddit comments
• Interviewing.io - free, anonymous technical interview practice with engineers from Google, Facebook, and more

Optimization

• Reasoning about performance (in the context of search)
• Braess's Paradox - how adding roads can cause more congestion

Algorithm fairness

• "Computers can solve your problem. You might not like the answer."

Papers

• Papers with code, sorted by stars
• The Morning Paper
  • an interesting/influential/important paper from the world of CS every weekday morning