Heaven
A person dies, and arrives at the gate to heaven. there are three doors. one of them leads to heaven. […]
Algorithms, Logic Puzzles, Math Problems
Brain Teasers, Logic Puzzles
Flipping Coins
Someone walks into your room and dumps a huge bag of quarters all over the floor. They spread them out
Logic Puzzles
Pennies
I challenge you to a game. we each get one penny and we flip them at the same time. (so
Brain Teasers, Data Structures, Logic Puzzles, Microsoft Interview Questions
Linked List
How does one find a loop in a singly linked list in O(n) time using constant memory? You cannot modify
Coding Interview Questions
Last Ball
You have 20 blue balls and 14 red balls in a bag. you put your hand in and remove 2
Algorithms, Logic Puzzles, Math Problems
Coin Rolls
Every night, I dump all the change in my pocket into a big bucket. When I buy things, I never
Coding Interview Questions
Calendar Cubes
A man has two cubes on his desk. every day he arranges both cubes so that the front faces show
Coding Interview Questions
Boys and Girls
In a country in which people only want boys, every family continues to have children until they have a boy.
Brain Teasers, Logic Puzzles
Painfully Easy
I flip a penny and a dime and hide the result from you. “one of the coins came up heads”,
Coding Interview Questions
Nuggets
You can go to a fast food restaurant to buy chicken nuggets in 6-pack, 9-pack or 20-packs. is there such
Coding Interview Questions
Orbs
You have two identical crystal orbs. you need to figure out how high an orb can fall from a 100
Arrays
World Series
You have $10,000 dollars to place a double-or-nothing bet on the Yankees in the World Series (max 7 games, series
Math Problems, Recursion
100 Factorial
how many trailing zeroes are there in 100! (100 factorial)? Solution One per factor of 10, and one per factor
Math Problems, System Design
Oil Mogul
You are an oil mogul considering the purchase of drilling rights to an as yet unexplored tract of land. The