5 min read The Burning Ropes Puzzle: Measure 45 Minutes with Two Ropes That Burn Unevenly The burning ropes puzzle is a famous […] Read article
5 min read Probability Distribution Functions: PMF, PDF, CDF, and the Common Distributions Understanding probability distribution functions is foundational for quant trading interviews, […] Read article
6 min read Reverse a Doubly Linked List: Iterative, Recursive, and the Common Mistakes Reversing a doubly linked list (DLL) is a classic […] Read article
5 min read Bayesian Weather Forecasting: How Forecasts Update with Evidence “How do you forecast tomorrow’s weather given today’s observation?” is a classic […] Read article
1 min read When was the last year that looked the same upside down? (1961) 2026 Update: Strobogrammatic Numbers — Rotation Invariant Digits […] Read article
3 min read A typical programming interview question is “reverse a string, in place”. if you understand pointers, the solution is simple. even […] Read article
3 min read problem: two trains enter a tunnel 200 miles long (yeah, its a big tunnel) travelling at 100 mph at the […] Read article
3 min read Two MIT math grads bump into each other at Fairway on the upper west side. They haven’t seen each other […] Read article
4 min read Problem: you are given a sequence of numbers from 1 to n-1 with one of the numbers repeating only once. […] Read article
3 min read You have three jars that are all mislabeled. one contains peanut butter jelly beans, another grape jelly jelly beans, and […] Read article