P2916 [USACO08NOV]为母牛欢呼Cheering up the C… 题目描述 Farmer John has grown so lazy that he no longer wants to continue maintaining the cow paths that currently provide a way to visit each of his N (5 <= N <= 10,000) pastures (conveniently numbered 1..N).…

题目描述 Farmer John has grown so lazy that he no longer wants to continue maintaining the cow paths that currently provide a way to visit each of his N (5 <= N <= 10,000) pastures (conveniently numbered 1..N). Each and every pasture is home to one cow.…

题目描述 Farmer John has grown so lazy that he no longer wants to continue maintaining the cow paths that currently provide a way to visit each of his N (5 <= N <= 10,000) pastures (conveniently numbered 1..N). Each and every pasture is home to one cow.…

https://www.luogu.org/problem/show?pid=2916 题目描述 Farmer John has grown so lazy that he no longer wants to continue maintaining the cow paths that currently provide a way to visit each of his N (5 <= N <= 10,000) pastures (conveniently numbered 1..N)…

洛谷P1546 最短网络 Agri-Net 最小生成树模板题. 直接使用 Kruskal 求解. 复杂度为 \(O(E\log E)\) . #include<stdio.h> #include<string.h> #include<algorithm> using namespace std; const int maxn = 105 * 105; int n, x, tot, ans, f[105]; struct edge{ int from, to, w; bo…

题目描述 国防部计划用无线网络连接若干个边防哨所.2 种不同的通讯技术用来搭建无线网络: 每个边防哨所都要配备无线电收发器:有一些哨所还可以增配卫星电话. 任意两个配备了一条卫星电话线路的哨所(两边都ᤕ有卫星电话)均可以通话,无论 他们相距多远.而只通过无线电收发器通话的哨所之间的距离不能超过 D,这是受收发器 的功率限制.收发器的功率越高,通话距离 D 会更远,但同时价格也会更贵. 收发器需要统一购买和安装,所以全部哨所只能选择安装一种型号的收发器.换句话 说,每一对哨所之间的通话距离都是同一…

P2915 [USACO08NOV]奶牛混合起来Mixed Up Cows 题意: 给定一个长\(N\)的序列,求满足任意两个相邻元素之间的绝对值之差不超过\(K\)的这个序列的排列有多少个? 范围: \(0<=n<=16,0<=序列元素<=25000,0<=k<=3400\) 统计次数一般是递推干的事情,但是我们发现,这个递推并没有一个很明显的顺序关系,并不可以说前几个转移到下一个之类的. 看看数据这么小,一般都是状压干的事情了. 我们可以按照规模进行递推,即一个大小…

嗯... 题目链接:https://www.luogu.org/problemnew/show/P1546 首先不难看出这道题的思想是用了最小生成树,但是这道题有难点: 1.读题读不明白 2.不会读入 3.跑多了 针对1: 首先这道题和其他题一样,你所读入的矩阵中的每一个数字都代表着相邻两点之间的边的边权,而这个点所处的位置即可以用(i,j)来表示,然后再进行操作即可 针对2: 我们会发现这个N*N的矩阵是关于对角线对称的,所以我们只需要读上面一部分或者下面一部分即可(要读上面一部分读入时则特判…

嗯... 题目链接:https://www.luogu.org/problemnew/show/P1195 思路: 首先可以判断这道题是用最小生成树来做的,然后在将其合并时用ans记录一下它的总消耗,然后用一个sum记录一下一共将几块云朵合并在了一起.... 每合并完一次,都要进行判断(k是否等于n-sum,即是否已经合并成了k块棉花糖),如果已符合题意,则return即可.这是这道题的一个重点,否则会继续跑下去.... AC代码: #include<cstdio> #include<i…

P2915 [USACO08NOV]奶牛混合起来Mixed Up Cows 题目描述 Each of Farmer John's N (4 <= N <= 16) cows has a unique serial number S_i (1 <= S_i <= 25,000). The cows are so proud of it that each one now wears her number in a gangsta manner engraved in large le…