Your grid has no solution since 2 appear twice in the second row. 
-,-,4,-,-,2,-,-,3
-,2,2,-,9,-,7,1,5 <----
7,-,-,3,1,-,4,-,-
-,1,-,-,-,-,2,-,9
-,4,-,2,7,-,-,-,6
2,8,-,5,-,-,-,-,-
5,-,-,-,-,3,6,-,4
-,3,1,-,-,8,-,-,2
4,6,-,-,5,-,-,3,1

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Sorry, the program is not very friendly about errors. I kinda try to get the algorithm right then work on the error checking...

In reply to Re^2: Subroutine overhead in Perl by enemyofthestate
in thread Subroutine overhead in Perl by enemyofthestate

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