Salaries
2 min read Three coworkers would like to know their average salary. how can they do it, without disclosing their own salaries? Solution […] Read article
Uncategorized
Arrays
World Series
2 min read You have $10,000 dollars to place a double-or-nothing bet on the Yankees in the World Series (max 7 games, series Read article
Math Problems, Recursion
100 Factorial
1 min read how many trailing zeroes are there in 100! (100 factorial)? Solution One per factor of 10, and one per factor Read article
Math Problems, System Design
Oil Mogul
2 min read You are an oil mogul considering the purchase of drilling rights to an as yet unexplored tract of land. The Read article
Bit Manipulation
Vienna
2 min read It’s the middle ages, you’re travelling across europe and you want to find the way to vienna. you come to Read article
Math Problems
Duel
3 min read You find yourself in a duel with two other gunmen. you shoot with 33% accuracy, and the other two shoot Read article
Dynamic Programming
Hen
2 min read If a hen and a half lay an egg and a half in a day and a half, how many Read article
Arrays
Box ‘o Numbers
2 min read Arrange the numbers 1 to 8 in the grid below such that adjacent numbers are not in adjacent boxes (horizontally, Read article
Brain Teasers, Logic Puzzles
Coin Problem
2 min read some of you may have easily solved the pill weighing problem posed here. If so, you are going to love Read article
Coding Interview Questions
Parallel Lines
2 min read Solution Not really much to solve 🙂 2026 Update: Parallel Lines — Geometry Algorithms and Line Intersection Determining if lines Read article
Coding Interview Questions
Moving Circles
2 min read Solution You may be able to find the solution on the discussion forum. 2026 Update: Collision Detection — Computational Geometry Read article
Coding Interview Questions
Black Dots
2 min read Solution You may be able to find the solution on the discussion forum. 2026 Update: Gestalt Perception and Counting Algorithms Read article
Brain Teasers, Dynamic Programming
X Implies Y
3 min read Part I (you can’t use paper, you have to figure it out in your head) i have a black triangle, Read article
Bit Manipulation
XOR using NAND gates
2 min read Create an XOR gate using only NAND gates. (BTW, mostly all circuit problems assume you have two inputs plus 0 Read article
System Design
Smart Cookie
2 min read Did you ever wonder how they make those pillsbury cookie dough rolls with the intricate faces inside them? Look here and Read article