#!ruby -pla z,*o=$F.map &:to_i *b=[] *f=0 f.map{|t|t<z&&o.map{|c|b[c+t]||=f<<c+t&&b[t]+[c]}} $_=[b[z]||:-]*' '
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
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