Dec 1, 2025 · 7 min read · 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...
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Nov 1, 2025 · 4 min read · Overview: This puzzle involved calculating the maximum probability q of a game of baseball played between two robots to reach „full-count“ (three balls and two strikes). At each turn, the two robots (one as the pitcher and the other as the batter) si...
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Jun 2, 2025 · 10 min read · 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...
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May 1, 2025 · 2 min read · 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...
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Apr 1, 2025 · 2 min read · 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...
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Mar 1, 2025 · 4 min read · 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...
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Jul 27, 2024 · 2 min read · Hello everyone, Today, I want to share my experience interviewing with Jane Street for their software engineering internship position. I hope this can provide some insight and guidance for those of you preparing for similar opportunities. Resume Scre...
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