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二项式反演公式好象就是容斥原理的一种特殊形式

Posted by windy7926778 at 2007-11-18 11:54:09
In Reply To:B是用二项式反演公式,F我觉的比较难办,二维线段树不可解 Posted by:windy7926778 at 2007-11-18 11:52:26


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