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#1 superprismatic


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Posted 25 July 2010 - 08:09 PM

This problem is about Reverse Polish Notation (RPN) which is explained at http://en.wikipedia....olish_notation.

Using RPN with operators chosen from the set {+,-,×,÷}, what is the smallest positive integer
which cannot be made from the string of digits 123456789 (in that order) with eight operators
interspersed to make a well-formed RPN expression?

As an RPN example, the string 12+3+4+5+6+7+8+9 evaluates to 45, 123456789++++++++ evaluates to 45,
1234+-5/67××-89++ evaluates to 60, and 123456789-+-+-+-+ evaluates to 1.
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#2 archlordbr


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Posted 25 July 2010 - 11:01 PM

This RPN is too complicated to me :wacko:
By the way, the link you posted is misspelled. You need to remove the dot in the end.
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