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A sequence of letters Puzzles for children  Weight: 0 Liked the puzzle: 100% 03.01.2010
Continue the sequence O,T,T,...
Comments:  1 check your solution  
A power of 2 Puzzles for programmers  Weight: 0 Liked the puzzle: 100% 06.01.2010
A positive integer is given. How can you determine whether it is a power of 2 without using recursion and floating point operations?
Comments:  8 check your solution  
No head Puzzles for children  Weight: 0 Liked the puzzle: 100% 07.01.2010
How can a man be in a house without his head?
Comments:  1 check your solution  
Two rivers Riddles, jokes  Weight: 0 Liked the puzzle: 33% 10.01.2010
Two rivers are flowing side by side. One is red, one is white. If they are to meet, bad things will happen. What are these rivers?
Comments:  1 check your solution  
Twenty asterisks Puzzles for programmers  Weight: 0 Liked the puzzle: 100% 13.01.2010
A text of a C code is given below. Find three different ways to replace one symbol so that the resulting code would print 20 asterisks. A symbol has to be replaced, not added or deleted.
main() { int i, N=20; for (i = 0 ; i < N ; i--) { printf("*"); } }
Comments:  3 check your solution  
What's for dinner? Riddles, jokes  Weight: 0 Liked the puzzle: 100% 17.01.2010
A family cooks a dinner. The father decides to make a joke and puts a handful of salt into the pot. A few minutes later the eldest son does the same thing, followed by his two younger brothers. A little daughter had also added her handful of salt into the pot. When the dinner was ready, everybody had to put more salt into it. What was being cooked?
Comments:  1 check your solution  
Seeing through the walls Puzzles for children  Weight: 0 Liked the puzzle: 100% 20.01.2010
A microscope is a device that allows to see very small things, a telescope is a device that allows to see things far far away. What is the name of a device that allows to see through the walls?
Comments:  1 check your solution  
An integer array Puzzles for programmers  Weight: 0 Liked the puzzle: 100% 20.01.2010
I. A large array of integer values is given. All values appear twice except one which appears once. How to find this value using at most O(1) additional variables and browsing through the entire array at most O(1) times.
II. Same, except now exactly two values appear once.
Comments:  6 check your solution  
Late for work Other puzzles  Weight: 0 Liked the puzzle: 66% 24.01.2010
One Megamind lived in a country ruled by a ruthless despot, terrorizing the entire population. The laws were so strict that thousands of people were sentenced for any slight misbehavior and thrown into prison. For being more than 10 minutes late for work, any unfortunate soul would be incarcerated for 5 years. Once, an elderly worker was late for 12 minutes. His immediate boss filed the report, and the worker was arrested and tried in court. The court did not have a choice of many defenders because everybody was afraid to become one. The Megamind was also scared but he also knew that there was a way to save the man, so he stepped up and became the man's defense attorney. In court, the Megamind addressed the audience and asked them a single question. A few minutes later, the man was set free by the court. What question did the Megamind ask?
Comments:  3 check your solution  
A ring in a coffee mug Riddles, jokes  Weight: 0 Liked the puzzle: 100% 29.01.2010
A Megamind accidentally dropped his ring into a mug with coffee. Yet he managed to retrieve the ring without wetting his finger. How could that happen?
Comments:  1 check your solution  
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