Found a puzzle on the notorious Futility Closet web site.
Here’s Futility Closet’s puzzle. Mr or Ms Closet decided to call the puzzle “Gun Control”. I don’t know if they chose the title to skirt controversy or something.
Problem Statement
Marksman A hits a certain small target 75 percent of the time. Marksman B hits it 25 percent of the time. The two of them aim at that target and fire simultaneously. One bullet hits it. What’s the probability that it came from A?
One of my kids passed along a logic problem.
Another programming interview question from the Daily Coding Problem email list. I received it as #1608.
Daily Coding Problem: Problem #1608 [Medium]
This problem was asked by Microsoft.
Write a program to determine how many distinct ways
there are to create a max heap from a list of N given integers.
For example,
if N = 3,
and our integers are [1, 2, 3],
there are two ways, shown below.
3 3
/ \ / \
1 2 2 1
Repo for my code.
Oh look! A knights and knaves puzzle in a low rent kid’s funny papers strip. Can we solve this puzzle with the method of Raymond Smullyan’s Og and Bog problem? Let’s find out.
Make one box of mac-n-cheese, kids scarf it and clamor for more.
In my post about Raymond Smullyan’s Og and Bog puzzle, I wrote:
Smullyan has a clever solution in the back of Logical Labyrinths, but I’m going to whittle the puzzle down to a size I can hold in my head, because I like procedures to solve puzzles. Having a procedure keeps me from making mistakes, and developing the procedure helps me understand the underpinnings of all problems.
I thought of something that makes Smullyan smarter than I believed.
Here’s a video (youtube of course) review of both Starship Troopers the movie, and Starship Troopers the book.
It’s long, but worth it.
Raymond Smullyan, my favorite mathematician, posed a large number of questions involving the Isle of Knights and Knaves. Inhabitants are either knights, who always tell the truth, or knaves, who always tell falsehoods.
One of the best Knight and Knave problems is Og and Bog from Smullyan’s book Logical Labyrinths
Og and Bog are brothers living on the Isle of Knights and Knaves, and one of them is the chief.
Which one is the chief?
An intelligent species (or confederation of species) might choose to use base 7 for their numeral system, no matter the exact number or nature of digits at the terminal end of their manipulative appendages.
Even entities with 8 terminal sub-appendages might use base 7.