Tag Archives: puzzles

Color the solutions to the “Find the squares in C#” puzzle

The post Solve the “Find the squares in C#” puzzle explained how you can find solutions to the puzzle described in the post Puzzle: Find the squares in C#. This example shows how you can color the solutions so squares … Continue reading

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Solve the “Find the squares in C#” puzzle

This post shows how to solve the puzzle Puzzle: Find the squares in C#. The program howto_square_puzzle_solution uses the following code to define the puzzle’s 11 solutions. // Small squares. Solutions.Add(new int[] { 0, 1, 4, 3 }); Solutions.Add(new int[] … Continue reading

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Puzzle: Find the squares in C#

The example Puzzle: Find the equilateral triangles in C# was fun, at least for me, so here’s another puzzle. This time your goal is find all of the squares that you can make using the red dots shown here. If … Continue reading

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Puzzle: Zero rows and columns in an array in C#

This puzzle is given as a coding example in the book Cracking the Coding Interview by Gayle Laakmann McDowell. The puzzle is: Write an algorithm such that if an element in an M x N matrix is 0, its entire … Continue reading

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Solution: The 40 pound stone puzzle

  This is the solution to The 40 pound stone puzzle. If you haven’t read the puzzle yet, click here before you read the solution. This puzzle similar to some of the puzzles in my book Interview Puzzles Dissected. The … Continue reading

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Puzzle: The 40 pound stone

This is a variation of a puzzle given on Car Talk. It’s similar to some of the puzzles in my book Interview Puzzles Dissected. A farmer uses a double-pan balance and a 40 pound stone to measure 40 pound weights: … Continue reading

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Make the basis for a card game in C#

The goal of this example is to provide some support for building a card game. It shows how to make a class to represent cards and to to tell what card is displayed in a PictureBox. It’s actually relatively straightforward. … Continue reading

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Verify sizes of playing cards in C#

Recently I wanted to use some playing cards in a program so I looked online for some nice images. I could have included 55 or so separate images (including jokers and backs), but I decided it would be easier to … Continue reading

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Five hats puzzle solution

If you haven’t read it yet, read the Five hats puzzle. Recall that the warden has three white hats and two black hats. If the first prisoner, Art, saw two black hats, then he would know that he had a … Continue reading

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Five hats puzzle

This “hats puzzle” was described on December 26, 2016 on NPR’s Car Talk show. Sadly Tommy died in 2014 and the show was a rebroadcast so this puzzler has probably been used before. My book Interview Puzzles Dissected doesn’t include … Continue reading

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