The question should be changed to that if you get $10^n,if you want more, you have to pick a given number from 1,2.....2^(n+1).if you can't you get 0.
$1,$10,$100,換,否則不換.
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misunderstood question,please read bottom.
-jinjing-
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06/19/2010 postreply
08:24:04