2015年4月17日
zoj.3868.GCD Expectation(数学推导>>容斥原理）
摘要： GCD ExpectationTime Limit: 4 Seconds Memory Limit: 262144 KBEdward has a set of n integers {a1, a2,...,an}. He randomly picks a nonempty subset {x1... 阅读全文
posted @ 2015-04-17 21:25 92度的苍蓝 阅读(597) 评论(0) 推荐(0)
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