Important Sisters Time Limit: 7000/7000 MS (Java/Others)    Memory Limit: 131072/131072 K (Java/Others)Total Submission(s): 766    Accepted Submission(s): 192 Problem Description There are N clones of Misaka Mikoto (sisters) forming the Misaka networ…

Time Limit: 7000/7000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others) Total Submission(s): 598 Accepted Submission(s): 143 Problem Description There are N clones of Misaka Mikoto (sisters) forming the Misaka network. Some pairs of sister…

支配树模板 #include<cstdio> #include<cstring> #include<algorithm> using namespace std; #define ll long long inline int read() { int x;char c; '); +c-'; return x; } #define MN 50000 #define MM 100000 struct ZPS { +MN+]; ],rh[MN+],v[MN+],en,fa[…

来自FallDream的博客,未经允许,请勿转载,谢谢. 给定一张图,求每个点到第n个点必须经过的点的编号之和.n<=50000 一道支配树裸题 然后统计答案的时候可以正着推,ans[i]=ans[idom[i]]+i #include<iostream> #include<cstdio> #include<cstring> #define MN 50000 #define ll long long using namespace std; inline int…

HDU \(Description\) 给定一张简单有向图,起点为\(n\).对每个点求其支配点的编号和. \(n\leq 50000\). \(Solution\) 支配树. 还是有点小懵逼. 不管了,说不定会讲,反正以后再说. https://blog.csdn.net/litble/article/details/83019578 有图的:https://blog.csdn.net/VioletSu/article/details/81041954 有题的:https://blog.csd…

求出支配树输出到father的和即可 支配树见:https://blog.csdn.net/a710128/article/details/49913553 #include<iostream> #include<cstdio> #include<vector> #include<cstring> using namespace std; const int N=300005; int n,m,h[N],cnt,se[N],id[N],rl[N],fa[N]…

问题描述 给出一张有向图,可能存在环,对于所有的i,求出从1号点到i点的所有路径上的必经点集合. 什么是支配树 两个简单的小性质—— 1.如果i是j的必经点,而j又是k的必经点,则i也是k的必经点. 2.如果i和j都是k的必经点,则i和j之间必然存在必经点关系,不可能互相都不是必经点. 不难发现所有的必经点关系形成了一个以1点为根的树形关系,每个点的支配点集合就是其到根节点(1点)路径上的点集,称这棵树为支配树. 怎么求支配树 假如我们得到的是一个有向无环图,那么只需要$O(N)$的做一遍拓扑排…

Problem Description Today is Ignatius' birthday. He invites a lot of friends. Now it's dinner time. Ignatius wants to know how many tables he needs at least. You have to notice that not all the friends know each other, and all the friends do not want…

Escape from Tetris Time Limit: 12000/4000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1103    Accepted Submission(s): 280 Problem Description 由于整日整夜地对着这个棋盘,Lele终于走火入魔.每天一睡觉,他就会梦到自己会被人被扔进一个棋盘中,一直找不到出路,然后从梦中惊醒.久而久之…

Play on Words Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 5622    Accepted Submission(s): 1850 Problem Description Some of the secret doors contain a very interesting word puzzle. The team…