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再说精确点,就是bell数...

Posted by livingroom at 2009-05-03 02:56:01 on Problem 1671
In Reply To:SimpleOut有问题!就是第二类Stirling数,组合数学上有公式,用高精度就可以了! Posted by:happyxiaoshiquan at 2009-04-28 14:45:03
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