Red Marbles, Blue Marbles
4 min read Problem: you have two jars, 50 red marbles, 50 blue marbles. you need to place all the marbles into the […] Read article
Brain Teasers, Data Structures, Dynamic Programming, Logic Puzzles
Algorithms, Brain Teasers, Logic Puzzles
Bumblebee
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
Algorithms, Bit Manipulation, Brain Teasers, String Manipulation
int atoi( char* pStr )
4 min read Problem: write the definition for this function without using any built-in functions. if pStr is null, return 0. if pStr Read article
Bit Manipulation, Brain Teasers, Logic Puzzles
Daughters’ Ages
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
Algorithms, Dynamic Programming, Logic Puzzles, String Manipulation
Palindromes
3 min read Problem: this year on October 2, 2001, the date in MMDDYYYY format will be a palindrome (same forwards as backwards).10/02/2001when Read article
Algorithms, Bit Manipulation, Brain Teasers, Logic Puzzles, Math Problems, Recursion
Sum it Up
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
Brain Teasers, Logic Puzzles
Pirates
6 min read Five pirates have 100 gold coins. they have to divide up the loot. in order of seniority (suppose pirate 5 Read article
Bit Manipulation, Brain Teasers, Logic Puzzles, String Manipulation, System Design
Fog Creek Programmers
5 min read 100 fogcreek programmers are lined up in a row by an assassin. the assassin puts red and blue hats on them. Read article
Bit Manipulation, Brain Teasers, Logic Puzzles
Bad King
3 min read A bad king has a cellar of 1000 bottles of delightful and very expensive wine. A neighbouring queen plots to Read article
Brain Teasers
Jelly Beans
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
Brain Teasers, Logic Puzzles, Microsoft Interview Questions
Bridge
3 min read Problem: this one is a classic that many of you have probably already heard, but all the more reason why Read article
Algorithms, Bit Manipulation, Brain Teasers, Logic Puzzles, Math Problems, System Design
Card Trick Without the Trick
5 min read This is a card trick without the trick. there is no sleight of hand, no tricks up my sleeve, no Read article
Logic Puzzles
Pirates Revisited
3 min read A slightly different version of the original pirates problem (read that one first to get all the rules). 6 pirates, Read article
Brain Teasers, String Manipulation
Fuse on Fire
3 min read A mad bomber is out on the job, making bombs. he has two fuses (pieces of string) of varying thickness Read article
Brain Teasers, Data Structures, Logic Puzzles
Dave’s on Fire
3 min read dave winer is stuck on a deserted island, with lots of trees, which is very thin and ten miles long Read article