Wolfram Language Paclet Repository
Community-contributed installable additions to the Wolfram Language
FredSimons`SudokuHints`
SolveSudoku |
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Details and Options
Examples
(4)
Basic Examples
(4)
In[1]:=
str="200030080078000001040006000054000700000009003100000240005000900080010000000020030";
This sudoku cannot be solved by our rules:
In[2]:=
sud=
[str]
 | ReduceSudoku |
Clues22,HiddenPairs1,LockedCandidates1,Solved0
Out[2]=
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We can find a solution:
In[3]:=
| SolveSudoku |
Out[3]=
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This does not automatically mean that the sudoku has exactly one solution. If we want to be sure, we have to look for two solutions, using backtracking:
In[4]:=
| SolveSudoku |
| MaxSolutions |
::steps
Out[4]=
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This is a list with only one solution, so the solution is unique.
We can solve the empty sudoku:
In[1]:=
| SolveSudoku |
| MaxSolutions |
::steps
Out[1]=
,,,
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The next sudoku has 16 clues. Since for a standard sudoku at least 17 clues are required for a unique solution, this sudoku may have none or more than one solution.
In[1]:=
sud=
["800000000000070000000800000076005900000000007000003000000700000700018000040000570"]
| SudokuFromString |
Out[1]=
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In[2]:=
| ReduceSudoku |
Clues16,Solved0
Out[2]=
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In[3]:=
| SolveSudoku |
::nosol
Out[3]=
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The function SolveSudoku can be used with multi sudoku's:
In[1]:=
sud=
["007200060000900400400000059000008700052000000409000305800060400008000070306020107004007000000081000032600009040000000000000100030010000000070000000940000009000000000034018000000000080036400000940100085060000800000070000000007000002000001040000080000001000090310009004730700300000520900080005040680000006090002085000350100070100000073000200015006000000041000000000000200&&0L0L010D1$3n3z"]
| SudokuFromString |
After some time, we have to abort the next command:
With ReduceSudoku, we see that there is a unique solution: