99 lines
5.2 KiB
Markdown
99 lines
5.2 KiB
Markdown
# Sudoku Funpark
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Creating worlds most inefficient Sudoku solver, by trying every option, without any smart approach.
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_(This was a learning project to get a better grasp of Golang. But more important; It was fun to do!.)_
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## Goals
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* Create the most inefficient Sudoku solver imaginable
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* Be a learning experience for the Go programming language
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I wrote [a blog post](https://blog.ligthert.net/posts/exploration-fun-and-process-cycles-of-sudoku/) about this.
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## Features
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* Worlds least efficient Sudoku solver
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* Ability to assign a number of CPU cores to this task
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* Split workloads among several computers
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## Usage
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To use the sudoku solver, run the binary with all the parameters available:
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```
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Usage of ./sudoku-funpark:
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-numcpu int
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Number of CPU cores to assign to this task. (default 12)
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-part int
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Process part x in n parts. Cannot be lower than 1, or higher than specified in split. (default 1)
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-row1 string
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1st row of the sudoku puzzle. (default "000000000")
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-row2 string
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2nd row of the sudoku puzzle. (default "000000000")
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-row3 string
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4rd row of the sudoku puzzle. (default "000000000")
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-row4 string
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4th row of the sudoku puzzle. (default "000000000")
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-row5 string
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5th row of the sudoku puzzle. (default "000000000")
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-row6 string
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6th row of the sudoku puzzle. (default "000000000")
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-row7 string
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7th row of the sudoku puzzle. (default "000000000")
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-row8 string
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8th row of the sudoku puzzle. (default "000000000")
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-row9 string
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9th row of the sudoku puzzle. (default "000000000")
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-split int
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Split the tasks in n parts. This depends on the availability of the first row. (default 1)
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```
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Instead of using the 3x3 blocks with 3x3 digits, it uses horizontal rows from top to bottom.
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## Example
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To see the solver in action, run the tool with the following parameters.
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For a short running (~15 seconds) example:
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> $ ./sudoku-funpark -row1 769104802 -row2 154800060 -row3 832700154 -row4 600900328 -row5 045328670 -row6 328670945 -row7 597410280 -row8 006283090 -row9 200590006
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For a long running (~1 hours 15 minutes) example:
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> $ ./sudoku-funpark -row1 769104802 -row2 154800060 -row3 002700150 -row4 600900308 -row5 045328670 -row6 328670945 -row7 597410280 -row8 006283090 -row9 200590006
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The outpot (of the short running parameters) will look something like this:
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```
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./sudoku-funpark -row1 769104802 -row2 154800060 -row3 832700154 -row4 600900328 -row5 045328670 -row6 328670945 -row7 597410280 -row8 006283090 -row9 200590006
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2025/01/24 00:05:58 Loading blocks
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2025/01/24 00:05:58 Loaded blocks (34.587221ms)
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2025/01/24 00:05:58 Populating blocks
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2025/01/24 00:05:58 Populated blocks (438.73054ms)
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2025/01/24 00:05:58 Number of (potential) solutions: 26542080
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2025/01/24 00:05:58 Validating solutions
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2025/01/24 00:05:59 Processing: 6% (1729332/26542080); Rate (avg): 1729330/sec for 1.000003166s; Time left (est.): 14 seconds
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2025/01/24 00:06:00 Processing: 13% (3461753/26542080); Rate (avg): 1732418/sec for 1.000002285s; Time left (est.): 13 seconds
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2025/01/24 00:06:01 Processing: 19% (5228965/26542080); Rate (avg): 1767215/sec for 1.000019297s; Time left (est.): 12 seconds
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2025/01/24 00:06:02 Processing: 26% (6996958/26542080); Rate (avg): 1767992/sec for 1.000200176s; Time left (est.): 11 seconds
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2025/01/24 00:06:03 Processing: 33% (8767450/26542080); Rate (avg): 1770495/sec for 1.000016352s; Time left (est.): 10 seconds
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2025/01/24 00:06:04 Processing: 39% (10576900/26542080); Rate (avg): 1809450/sec for 1.000014638s; Time left (est.): 8 seconds
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2025/01/24 00:06:05 Processing: 46% (12400058/26542080); Rate (avg): 1823158/sec for 1.000352862s; Time left (est.): 7 seconds
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2025/01/24 00:06:06 Processing: 53% (14185155/26542080); Rate (avg): 1785095/sec for 1.000254888s; Time left (est.): 6 seconds
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2025/01/24 00:06:07 Processing: 60% (15968402/26542080); Rate (avg): 1783245/sec for 1.000002305s; Time left (est.): 5 seconds
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2025/01/24 00:06:08 Processing: 66% (17655770/26542080); Rate (avg): 1687370/sec for 1.000068309s; Time left (est.): 5 seconds
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2025/01/24 00:06:09 Processing: 73% (19442885/26542080); Rate (avg): 1787111/sec for 1.000006984s; Time left (est.): 3 seconds
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2025/01/24 00:06:10 Processing: 79% (21183545/26542080); Rate (avg): 1740661/sec for 1.000002395s; Time left (est.): 3 seconds
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2025/01/24 00:06:11 Processing: 86% (22998945/26542080); Rate (avg): 1815402/sec for 1.000113534s; Time left (est.): 1 second
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2025/01/24 00:06:12 Processing: 90% (24109203/26542080); Rate (avg): 1110261/sec for 1.000312346s; Time left (est.): 2 seconds
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2025/01/24 00:06:13 Processing: 100% (26542080/26542080); Rate (avg): 0/sec for 1.000117421s; Time left (est.): N/A
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2025/01/24 00:06:13 Validated solutions (15.002654066s)
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2025/01/24 00:06:13
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Solution #1:
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769154832
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154832769
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832769154
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671945328
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945328671
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328671945
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597416283
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416283597
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283597416
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```
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# Caveats
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While this may very well solve all possible Sudoku puzzles (including the one [designed against brute force algorithms](https://en.wikipedia.org/wiki/Sudoku_solving_algorithms)), the blanks in the puzzle, the harder it is, the more possible solutions there are, the more solutions it needs to parse, the longer it takes. As this is a computational heavy program, the more CPU you throw against it the faster it will solve issues.
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