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dstarh/gist:237130

Created November 17, 2009 18:34
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gistfile1.rb
def r(a){def i=a.indexOf(48);if(i<0)print a else(('1'..'9')-(0..80).collect{j-> g={(int)it(i)==(int)it(j)};g{it/9}|g{it%9}|g{it/27}&g{it%9/3}?a[j]:'0'}).each{ r(a[0..<i]+it+a[i+1..-1])}}
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