Flipping Coins
2 min read Someone walks into your room and dumps a huge bag of quarters all over the floor. They spread them out […] Read article
Brain Teasers, Logic Puzzles
Logic Puzzles
Pennies
2 min read I challenge you to a game. we each get one penny and we flip them at the same time. (so Read article
Coding Interview Questions
Last Ball
3 min read You have 20 blue balls and 14 red balls in a bag. you put your hand in and remove 2 Read article
Algorithms, Logic Puzzles, Math Problems
Coin Rolls
4 min read Every night, I dump all the change in my pocket into a big bucket. When I buy things, I never Read article
Coding Interview Questions
Calendar Cubes
2 min read A man has two cubes on his desk. every day he arranges both cubes so that the front faces show Read article
Coding Interview Questions
Boys and Girls
2 min read In a country in which people only want boys, every family continues to have children until they have a boy. Read article
Brain Teasers, Logic Puzzles
Painfully Easy
2 min read I flip a penny and a dime and hide the result from you. “one of the coins came up heads”, Read article
Coding Interview Questions
Nuggets
2 min read You can go to a fast food restaurant to buy chicken nuggets in 6-pack, 9-pack or 20-packs. is there such Read article
Coding Interview Questions
Orbs
2 min read You have two identical crystal orbs. you need to figure out how high an orb can fall from a 100 Read article
Uncategorized
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
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
