一个n行m列的棋盘,每次能够放一个棋子.问要使得棋盘的每行每列都至少有一个棋子 须要的放棋子次数的期望. dp[i][j][k]表示用了k个棋子共能占据棋盘的i行j列的概率. 那么对于每一颗棋子,在现有的棋盘上,它可能有四种影响:新占了一行,新占了一列,既占了新的一行又占了新的一列.无影响. 对于每一种情况.dp[i][j][k]=原始状态的概率×选到这种位置的概率 最后算答案的时候注意到,题目问的是到第k个刚好放完n行m列.也就是最后一个棋子一定是有作用的, 所以用dp[i][j][k]-dp…
Clone Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 65536/65536K (Java/Other) Total Submission(s) : 8   Accepted Submission(s) : 5 Font: Times New Roman | Verdana | Georgia Font Size: ← → Problem Description After eating food from Chernobyl,…
Mart Master II Time Limit: 12000/6000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 675    Accepted Submission(s): 237 Problem Description Trader Dogy lives in city S, which consists of n districts. There are n - 1…
The 2014 ACM-ICPC Asia Mudanjiang Regional Contest 题目链接 没去现场.做的网络同步赛.感觉还能够,搞了6题 A:这是签到题,对于A堆除掉.假设没剩余在减一.B堆直接除掉 + 1就能够了 B:二分贪心,二分长度.然后会发现本质上是在树上最长链上找两点,那么有二分出来的长度了,就从两端分别往里移动那么长,那两个位置就是放置位置.然后在推断一下就能够了 D:概率DP.首先知道放一个棋子.能够等价移动到右上角区域,那么就能够dp[x][y][k],表示…
The 2014 ACM-ICPC Asia Mudanjiang Regional Contest A.Average Score B.Building Fire Stations C.Card Game D.Domination E.Excavator Contest F.Fiber-optic Network G.Garden and Sprinklers H.Hierarchical Notation I.Information Entropy J.Jacobi Pattern K.Kn…
2019-2020 ICPC, Asia Jakarta Regional Contest (Online Mirror, ICPC Rules, Teams Preferred) easy: ACEGHK medium-easy: BJL medium: D ?????: I A. B. C. 对 \(R[],C[]\) 分别按奇偶性分段. 网! D. 考虑 check 一个串,枚举右走对应的前缀 pre,下走对应的后缀 suf. 把每行反串拼接中间连特殊字符,建 SA,能 match 上 p…
ACM ICPC Central Europe Regional Contest 2013 Jagiellonian University Kraków Problem A: Rubik’s RectangleProblem B: What does the fox say?Problem C: Magical GCDProblem D: SubwayProblem E: EscapeProblem F: DraughtsProblem G: History courseProblem H: C…
Domination Time Limit: 8 Seconds      Memory Limit: 131072 KB      Special Judge Edward is the headmaster of Marjar University. He is enthusiastic about chess and often plays chess with his friends. What's more, he bought a large decorative chessboar…
Problem Description After eating food from Chernobyl, DRD got a super power: he could clone himself right now! He used this power for several times. He found out that this power was not as perfect as he wanted. For example, some of the cloned objects…
Tree http://acm.hdu.edu.cn/showproblem.php?pid=5044 树链剖分,区间更新的时候要用on的左++右--的标记方法,要手动扩栈,用c++交,综合以上的条件可过. #include<cstdio> #include<cstring> #include<algorithm> #pragma comment(linker, "/STACK:36777216") #define mt(a,b) memset(a,…