2018 ICPC 徐州网络赛 A. Hard to prepare 题目描述:\(n\)个数围成一个环,每个数是\(0\)~\(2^k-1\),相邻两个数的同或值不为零,问方案数. solution 将环变成链,设\(f[i][0\)~\(2]\),分别表示与第一个数相同,与第一个数不同,与第一个数相同,与第一个数的反相同.然后\(dp\)即可. 时间复杂度:\(O(n)\) B. BE, GE or NE solution 根据题目描述\(dp\)即可. 时间复杂度:\(O(nm)\) C.…

ICPC 2019 徐州网络赛 比赛时间:2019.9.7 比赛链接:The Preliminary Contest for ICPC Asia Xuzhou 2019 赛后的经验总结 // 比赛完才反应过来没看完全部题, J题树形dp没写太亏了... // 几何旋律AK了,太强了Orz // 虽然我们队A了8题,但如果时间分配好,认真读题避免看错题的话,应该至少多A一题 A. Who is better? 题意 两个人玩游戏,谁先消灭完敌人就赢.两条规则:1. 第一个人不能全部消灭完: 2.…

query Given a permutation pp of length nn, you are asked to answer mm queries, each query can be represented as a pair (l ,r )(l,r), you need to find the number of pair(i ,j)(i,j) such that l \le i < j \le rl≤i<j≤r and \min(p_i,p_j) = \gcd(p_i,p_j )…

[徐州网络赛]Longest subsequence 可以分成两个部分,前面相同,然后下一个字符比对应位置上的大. 枚举这个位置 用序列自动机进行s字符串的下标转移 注意最后一个字符 #include <bits/stdc++.h> const int maxn = 1e6 + 7; using namespace std; #define ll long long int n, m; char s[maxn], t[maxn]; int nex[maxn][27]; void init()…

54.19% 2000ms 262144K Morgana is playing a game called cacti lottery. In this game, morgana has a 3 \times 33×3 grid graph, and the graph is filled with 11 ~ 99 , each number appears only once. The game is interesting, he doesn't know some numbers, b…

https://nanti.jisuanke.com/t/31455 题意 给一个3*3的方格填入 1-9 九个数 有些数是已知的,有些数是对方已知但我未知的,有些数是大家都未知的 我要计算取得最大的对应值的期望 分析 题意有点难懂. 首先先枚举把剩下的数填入星号的情况(其实就是枚举星号的排列),这是对方所能知道的所有信息,然后对方将取八种决策中最优的情况,而因为井号的存在,所以其排列也会影响每种决策的分数,所以接着要枚举井号的排列情况,对于每种情况累加每个决策的分数,最后枚举完后,要除以井号排…

链接https://nanti.jisuanke.com/t/31455 思路 首先先枚举把剩下的数填入星号的情况(其实就是枚举星号的排列),这是对方所能知道的所有信息,然后对方将取八种决策中最优的情况,而因为井号的存在,所以其排列也会影响每种决策的分数,所以接着要枚举井号的排列情况,对于每种情况累加每个决策的分数,最后枚举完后,要除以井号排列数(期望=分数*概率),然后对方便会选择期望最高的决策,累加到最后答案中,枚举完所有星号的之后,需要将最后答案除以星号排列数 #include<bits/…

In a world where ordinary people cannot reach, a boy named "Koutarou" and a girl named "Sena" are playing a video game. The game system of this video game is quite unique: in the process of playing this game, you need to constantly fac…

After the long vacation, the maze designer master has to do his job. A tour company gives him a map which is a rectangle. The map consists of N \times MN×M little squares. That is to say, the height of the rectangle is NN and the width of the rectang…

BE, GE or NE 23.58% 1000ms 262144K   In a world where ordinary people cannot reach, a boy named "Koutarou" and a girl named "Sena" are playing a video game. The game system of this video game is quite unique: in the process of playing…