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Note that due to rounding the calculated probability for display, a probability of 0.5000 may appear after the Bet for. or Bet against. message.

Posted by HeadHunter at 2013-06-15 10:32:23 on Problem 1644 
WA两次……

用if (sum == 0.5)判断就对，用if (fabs(sum-0.5) < 1e-6)判断就错。。。
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