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Jamshrivelson


Puzzle Solutions

Interview line splitting

What is the sum of the products of endless division?

Posted on June 1, 2024

Tags: scaling recursion

The radius of a rectangle

What would the world look like if you could only see squares?

Posted on May 19, 2024

Tags: scaling geometry

Can you beat the heats?

A good old racetrack whodunit.

Posted on May 6, 2024

Tags: information-theory trees

Capture the flag

How often can you win when you have a number and they have an arrow?

Posted on May 1, 2024

Tags: geometry game-theory expectation jane-street

Card collisions

What's the chance no card sees its own reflection?

Posted on April 21, 2024

Tags: approximation recursion mean-field

Paint by number

Cluster your expectations

Posted on April 9, 2024

Tags: approximation

Pick a circle, any circle

What chance is there, for a circle inside a square?

Posted on February 19, 2024

Tags: conditional-probability transformations jane-street

Traffic light chase

How long until you meet your menacing assailant?

Posted on October 23, 2023

Tags: counting convolution

Pinball lights

How many shots does it take to turn the lights on?

Posted on October 1, 2023

Tags: master-equation

Unbalanced league

How often will geography rob your team of a playoff berth?

Posted on September 18, 2023

Tags: diagrams counting inclusion-exclusion
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Josh Silverman  •  2025

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