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郁闷了很久，原来

Posted by blablabla at 2007-03-26 16:06:09 on Problem 1742 
用
  bool has(int n)
  {
    return n == 0 || (n > 0 && exist[n]);
  }
就会TLE

用exist[n]只要1000多ms

sigh.....
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