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The die is used for control flow here -- there's a deep recursion going on, and once a solution is found, all of these recursive subs can be terminated at once. That's what die does.

And warn doesn't -- it just prints a warning, and doesn't abort the current routines. So it makes the solver search for more solutions even after a solution is found. Which is why it takes much longer.

A possible (still hacky) approach is to do the BLOCK form of eval to catch the exception, print the result and then start the recursion anew with the next Sudoku.


In reply to Re: Sudoku solver by moritz
in thread Sudoku solver by ecube

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