Wednesday, September 20, 2017

logical deduction - Special 5x5 Sudoku-like table


This is a special 5x5 Sudoku-like table.
Each row, column, and diagonal contains digits from 1 to 5 (including diagonals obtained by wrapping around the edges).
To filter duplicates (by rotation, reflection, permutations), I put numbers in ascending order (1,2,3,4,5) to the first row of the tables.


We can create another table like this, by logical deduction.


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Find another solution, by filling the blanks squares!


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Answer



Here is another solution:




1 2 3 4 5
3 4 5 1 2
5 1 2 3 4
2 3 4 5 1
4 5 1 2 3



(There's not much to say about the method of solution. I tried putting something other than 5 in the (2,2) position; there was only one option; there were only two options for the next thing to the right, one of which quickly turned out impossible; after that it was just a matter of filling in the only possible number at each step. So this is the only solution that has 12345 along the top and doesn't have 5 in position (2,2). Perhaps there are other solutions with 5 at (2,2); I haven't checked; but I suspect not.)


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