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Jane Street Puzzle Writeups
Overview: Problem summary: We must mark each cell of the 20×20 grid as either inside or outside. To help us the grid contains some special cells with the following rules: Arrow cells: Arrow cells are per definition outside. Arrow cells can have one o...
Overview: This puzzle involved extracting a sentence from a PDF file. The PDF contained images of mosaics arranged in a 3×3 grid, with some Scrabble letters on the sides. (Here’s the link to the PDF: https://www.janestreet.com/static/pdfs/puzzles/jun...
Overview This puzzle is about solving an 11 by 11 grid containing 9 different bordered regions. Source: https://www.janestreet.com/puzzles/may-2025-update.png Regions: Start by inserting numbers 1-9 into the different regions. Not all numbers in the...
I really enjoyed working on this months puzzle which involved labeling nodes in an infinite binary tree (0 with the probability of p and 1 otherwise). The goal was to find the value of p so the probability of an infinite path along the binary tree (w...
After solving the last puzzle just in the nick in time, I was eager to dive into the next one. Fortunately, this one turned out to be much more straightforward. I started by building a visualizer, to better understand how the puzzle functioned. After...
Starting out this puzzle proved to be far more challenging than its predecessors. Giving no direct clues apart form the title. This article outlines the process we followed in solving this intricate puzzle. Naive beginnings Starting out we simply ass...
