摘要：
2016暑假多校联合 World is Exploding Problem Description Given a sequence A with length n,count how many quadruple (a,b,c,d) satisfies: a≠b≠c≠d,1≤a<b≤n,1≤c<d 阅读全文
摘要：
2016暑假多校联合 Another Meaning Problem Description As is known to all, in many cases, a word has two meanings. Such as “hehe”, which not only means “hehe” 阅读全文
摘要：
2015-2016 ACM-ICPC, NEERC, Northern Subregional Contest D Problem D. Distribution in Metagonia Input file: distribution.in Output file: distribution.o 阅读全文