摘要：2020 KAIST 10th ICPC Mock Contest (XXI Open Cup. Grand Prix of Korea. Division 2) B. Bombs In My Deck D. Fix Wiring F. Square, Not Rectangle H. Mock C 阅读全文

摘要：问在x,y范围内Σyk=xDI(K)为多少? DI(K)定义为di>dj&&i<j ,K由dn....d2d1d0构成如DI(123) = 3(d2<d1,d2<d0,d1<d0)DI(253) = 2(d2<d0,d1<d0) 那么我们就数位dp一下，访问所有的数，h[cur][flag][lim 阅读全文