Killer sudoku (also killer su doku, sumdoku, sum doku, sumoku, addoku, or samunamupure) is a puzzle that combines elements of sudoku and kakuro. Ubuntu 8.The same example problem, as it would be printed in black and white.ASU Spring 2009 Class Schedule / Ratemyprof Opinion.ASU CSE Capstone Classes Now Offered Single Semester.The Line Between Useful Features and Overcomplicated Devices.Java Sudoku Solver and Wikipedia Exaggeration.Sharing Firefox Profiles on Dual Boot Systems.Confessions of a Science Fiction Addict.Nano Text Editor Tutorial for Programmers.Pondering on the Teaching of Mathematics.A Programmer’s Quest for Primes: Part 1 – Brute Force.A Programmer’s Quest for Primes: Part 2 – Sieve of Eratosthenes.A Programmer’s Quest for Primes: Part 3 – Prime Distribution.A Programmer’s Quest for Primes: Part 4 – Special Primes.AVR Butterfly Part 2: Setting the BOOTRST Fuse with ISP Cable.Dell Vostro 1400 Nvidia 8400M GS Problems.Dell Vostro 1400 Nvidia 8400M GS Problems (part 2).Starving College student: will code for ramen.Annoying bug: escaped newline in C comment.Windows Vista/Windows 7 Junctions (Access Denied “Problem”).Windows 7 Startup Repair Tool Unhelpful Results.Event/Emergency APRS Network Brainstorming.On the n’th day of Christmas, my (assert love=true) love sent to me….Newegg Build Part 3: Software and Benchmarking.Thoughts on Learning DVORAK (or other alternate keyboard layouts).New Gadget: Amazon Kindle 3 Review (Part 2).Building a MiniITX File Server for under $300.Unseen sacrifices of becoming more efficient.How to excel in Computer Science or Engineering.Linux Tip: Arrow keys not working for command input? RLFE to the rescue.NOVA: Network Antireconnaissance with Defensive Honeypots.All about network configuration in Ubuntu Server 12.04/12.10.Neighbor Cache Fingerprinter: Operating System Version Detection with ARP.Jade Mixins (blocks, attributes, and more).Thoughts on Open Source Software Development.25 Things I’ve learned in Software Development.Four steps for describing cloud anchitectures on a whiteboard. Note: I’ll throw up a link to my solver once I get a GUI together and put up an applet. Wait, it solved it in just over 2 minutes? If for some reason I got an answer that less than 640,000,000 iterations were tested, I would start wondering how it solved it differently, but I had nearly 100 million MORE iterations than the Wikipedia article said was needed, and I still solved it much faster, with only a 1.4ghz Intel Core 2 Duo.Īpparently some Sodoku fans like to exaggerate about how hard their puzzles really are… Either that, or they really sucked at writing the code to check if a value is legal. However, before I even look away, my results pop up. “Perfect!” I thought to myself, and plugged it in, thinking it was time to go get a cup of coffee and read my latest Asimov novel for 30 minutes. Based on the specific construction of the computer code, programmers have found the solution time for this puzzle to be between 30 and 45 minutes with a computer processor running at 3 GHz. These iterations do not include the work involved at each step to learn if each digit entered is valid or not (required for every iteration). If one iteration is defined as one attempt to place one value in one cell, then this puzzles requires 641,580,843 iterations to solve. Thus a brute-force solver will spend an enormous amount of time “counting” upward before it arrives at the final grid which satisfies the puzzle. Solving this puzzle by brute-force requires a large number of iterations because it has a low number of clues (17), the top row has no clues at all, and the solution has “987654321” as its first row. On Wikipedia I found the “Near worst case sudoku puzzle for brute force solver”, located below. Most puzzles it can solve in less than a second, even the ones rated “evil”, but I decided to try and find hard ones for it. It does this until the main stack is empty. Once it reaches a number it can’t find, it goes back one and increases that number to the next legal one. It starts at the first number, checks to see if it can be a 1, 2, 3, etc. The program located all the unknowns, adds them as pairs to the first stack, and gets to work checking for legal values when told to solve. I created a pair object to store (x,y) values into the stacks, and then made two stacks. First off I made the grid with a simple 9×9 array, filled it with some test numbers. I used two stacks and a pure brute force method of solving. This time I decided to tackle Sodoku in Java instead. Feeling like programming, I decided to work on another puzzle solver other than my Rubik’s Cube program.
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