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Logic Puzzles in Visual C#
Appendix A Encoding QR Code JIS X 0510 In C# Using Barcode maker for Visual Studio .NET Control to generate, create QR image in .NET applications. www.OnBarcode.comReading QR Code ISO/IEC18004 In C#.NET Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET framework applications. www.OnBarcode.comLogic Puzzles
Painting Barcode In Visual C# Using Barcode printer for VS .NET Control to generate, create barcode image in .NET framework applications. www.OnBarcode.comRecognize Barcode In Visual C# Using Barcode scanner for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications. www.OnBarcode.com7, and 10. You ll need to add occurrences of some of the prime numbers to also cover 4, 8, and 9. It s suf cient to have 3 occurrences of 2 to get 4 and 8, and it s also suf cient to keep 2 occurrences of 3 to get 9. So, the minimum integer n that quali es can be expressed as 2 2 2 3 3 5 7 1 = 2519. QR Drawer In Visual Studio .NET Using Barcode generator for ASP.NET Control to generate, create QR Code image in ASP.NET applications. www.OnBarcode.comGenerating QR Code JIS X 0510 In .NET Framework Using Barcode maker for VS .NET Control to generate, create Quick Response Code image in VS .NET applications. www.OnBarcode.comPuzzle 2: Round Manhole Covers
Make QR Code 2d Barcode In VB.NET Using Barcode encoder for .NET framework Control to generate, create QR Code ISO/IEC18004 image in Visual Studio .NET applications. www.OnBarcode.comGS1 128 Drawer In C#.NET Using Barcode creation for VS .NET Control to generate, create UCC.EAN  128 image in VS .NET applications. www.OnBarcode.comManhole covers are typically made round as a safety measure. Any way you turn the round cover, it cannot fall into the round manhole because of its geometrical properties. With other geometrical shapes (rectangle, square, and so on), if you turn the cover in a certain way, it can fall into the manhole and endanger the people working there. Making Code 3/9 In Visual C# Using Barcode generator for .NET Control to generate, create Code 39 image in .NET framework applications. www.OnBarcode.comDrawing Data Matrix 2d Barcode In Visual C#.NET Using Barcode generator for .NET framework Control to generate, create Data Matrix 2d barcode image in Visual Studio .NET applications. www.OnBarcode.comPuzzle 3: Shaking Hands
Encoding Bar Code In Visual C# Using Barcode printer for .NET framework Control to generate, create bar code image in VS .NET applications. www.OnBarcode.comPrinting Leitcode In C# Using Barcode creation for Visual Studio .NET Control to generate, create Leitcode image in VS .NET applications. www.OnBarcode.comLet s start with the person who shook eight hands (call that person P8). All those who shook the hand of P8 (including myself and excluding the spouse of P8) shook at least one hand. Therefore, the spouse of P8 must be the person who shook zero hands (call that person P0). Now, take P8 and P0 out of the equation. You know that the remaining six people shook a known number of hands (exactly one) from the beingexcluded couple. So you subtract one from the answers of all remaining individuals. Simply imagine that you re now facing the same puzzle, but with four couples and with the seven individuals besides me replying to my question with the answers 0 through 6. You ll quickly conclude that the ve couples, including me and my wife, shook hands in the following chiastic manner: 8/0, 7/1, 6/2, 5/3, 4/4. Because I asked nine individuals how many hands they shook and I got nine unique answers, my wife and I must be the couple who shook four hands each. Hence, my wife shook four hands. Making Data Matrix 2d Barcode In Java Using Barcode maker for Java Control to generate, create Data Matrix image in Java applications. www.OnBarcode.comUPCA Reader In None Using Barcode scanner for Software Control to read, scan read, scan image in Software applications. www.OnBarcode.comPuzzle 4: Then There Were Five
Generating EAN / UCC  13 In None Using Barcode maker for Word Control to generate, create GTIN  13 image in Office Word applications. www.OnBarcode.comData Matrix 2d Barcode Printer In .NET Using Barcode creator for ASP.NET Control to generate, create Data Matrix image in ASP.NET applications. www.OnBarcode.comI ve seen several versions of solutions to this puzzle, but they re essentially all the same. Here s one with a bit of SQL in it: Given the lter expression col1 = 1 and col2 = 3, there are spaces between 1 and and and and and col2. Another version of the solution refers to a restaurant sign that says sh and chips, and the owner wants to replace the spaces between sh and and and and and chips with hyphens. Scan QR Code ISO/IEC18004 In C# Using Barcode reader for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications. www.OnBarcode.comCode 128C Generation In Visual Basic .NET Using Barcode encoder for .NET framework Control to generate, create Code128 image in .NET applications. www.OnBarcode.comPuzzle 5: Arranging Soldiers in a Row
Encoding DataMatrix In None Using Barcode printer for Software Control to generate, create DataMatrix image in Software applications. www.OnBarcode.comEncode DataMatrix In None Using Barcode encoder for Microsoft Excel Control to generate, create Data Matrix 2d barcode image in Microsoft Excel applications. www.OnBarcode.comThe key to the solution is that each soldier can put himself between the correct pair of (placed up to then) soldiers without knowing what s on his hat. Assuming you re one of the soldiers, here s the logic you would follow: If you enter the room rst, simply position yourself somewhere in the room so that the next soldier can see the sign on your hat. Inside Microsoft SQL Server 2008: TSQL Querying
If you re not the rst one in the room, look at the hats of the soldiers that are already there. If all soldiers have the same sign, stand to the right of the rightmost one in case that sign is a circle and to the left of the leftmost one in case the sign is a square. If some soldiers have a circle and some have a square, squeeze yourself between the two with the different signs. Puzzle 6: Crossing the Tunnel
Most people try to solve this puzzle by letting person A walk from start to end with each of the others, then walk back alone to pair with the next person. Intuition says that this approach must be the fastest because person A is the fastest. But if you calculate the total time it takes all four people to get to the end, you get 13 minutes. Of course, the pace is dictated by the slowest in the pair. Person A would need to go from start to end three times: with B (2 minutes), C (4 minutes), and D (5 minutes). These walks amount to 11 minutes, plus the two times that person A needs to walk back alone (1 minute per walk), and you get 13. The trick to solving the puzzle is to gure out that you can save most time by letting the two slowest people walk together. Here s the strategy that gets all the people across in 12 minutes: Persons A and B walk rst from start to end (2 minutes) Person A walks back (1 minute) Persons C and D walk from start to end (5 minutes) Person B walks back (2 minutes) Persons A and B walk from start to end (2 minutes)

