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网络流24题 这几天就慢慢把网络流补一补吧，慢慢更新 1.餐巾计划问题 "🔗" 主要考虑建图 1.第一天其实就可以把所有需要买的餐巾全买了，$S\rightarrow 1, cap = INF, fee = p$ 2.每天都需要消耗餐巾，控制流量，$i\rightarrow T, cap = r_ 阅读全文
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ACM ICPC 2018 焦作赛区网络预赛 $A. Magic Mirror$ 签到 $C. Password$ $D. Sequence$ $E. Jiu Yuan Wants to Eat$ 如果只有$1,2,4$操作那就是树剖的模板题了，现在多了一个操作$3$ 其实还是模板题，因为是对$2^ 阅读全文
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Acesrc and String Theory Problem Description Acesrc is a famous string theorist at Nanjing University second to none. He insists that we should always 阅读全文
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Problem E. Split The Tree Problem Description You are given a tree with n vertices, numbered from 1 to n. ith vertex has a value wi We define the weig 阅读全文
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Problem E. TeaTree Problem Description Recently, TeaTree acquire new knoledge gcd (Greatest Common Divisor), now she want to test you. As we know, Tea 阅读全文
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Boring counting Problem Description In this problem we consider a rooted tree with N vertices. The vertices are numbered from 1 to N, and vertex 1 rep 阅读全文
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Query on A Tree Problem Description Monkey A lives on a tree, he always plays on this tree. One day, monkey A learned about one of the bit operations, 阅读全文
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2019 ICPC Asia Yinchuan Regional $A. Girls Band Party$ $B. So Easy$ 给$n$行$n$列分别加上一个$\ge 0$的数，已知其他位置的数，求$x$行$y$列处的数是多少 每行每列全都减去当前行或列最小的那个数，第$x$行减去的值和第$ 阅读全文
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Luogu P6139【模板】广义后缀自动机（广义SAM） 模板题，把所有串加进去，计算不同子串的数量即可 cpp // pragma GCC optimize("O3") // pragma comment(linker, "/STACK:1024000000,1024000000") inclu 阅读全文
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2017 2018 ACM ICPC Northern Eurasia (Northeastern European Regional) Contest (NEERC 17) A.Archery Tournament 假设当前询问为$x,y$，那么能包含它的圆必然是其左边第一个直径$\ge y$的或 阅读全文