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Problem 5146 >> 求此题公式证明
Cydiater @ 2018-01-27 10:36:22
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RT
CQzhangyu @ 2018-01-27 10:59:08
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本人比较naive用无标号的方法拿组合数做的,大部分人都是用有标号的方法拿微积分做的。
我的做法:http://www.cnblogs.com/CQzhangyu/p/8361074.html
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