摘要：
题目大意： 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≤n,Aa<Ab,Ac>Ada≠b≠c≠d,1≤a<b≤n,1≤c<d≤n,Aa<Ab, 阅读全文
posted @ 2017-09-04 21:58
愿~得偿所愿，不负时光
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摘要：
题目大意： 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≤n,Aa<Ab,Ac>Ada≠b≠c≠d,1≤a<b≤n,1≤c<d≤n,Aa<Ab, 阅读全文
posted @ 2017-09-04 15:21
愿~得偿所愿，不负时光
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