题目链接:https://www.luogu.org/problemnew/show/P2881 题目链接:https://vjudge.net/problem/POJ-3275 题目大意 给定标号为 1~N 这 N 个数,在给定 M 组大小关系,求还需要知道多少组大小关系才可以给这组数排序? 分析1(Floyd + bitset) 总共需要知道 n * (n - 1) / 2 条边,因此只要求一下现在已经有了多少条边,再减一下即可.由于大小关系有传递性,因此计数之前需要求传递闭包. 直接上 f…

1.破坏{DOLD题2} sabotage.pas/c/cpp [问题描述] 农夫约翰的头号敌人保罗决定破坏农民约翰的挤奶设备.挤奶设备排成一行,共N(3<= N <=100000)台挤奶机,其中第i个台挤奶机生产M_i单位(1 <= M_i<=10,000)的牛奶. 保罗计划切断一段连续的挤奶机,从第i台挤奶机到第j台挤奶机(2<= i<= j<= N-1).注意,他不希望断开第一台或最后一台挤奶机,因为这将会使他的计划太容易被发现.保罗的目标是让其余机器的平均…

意甲冠军: 一些树高给出.行一种操作:把某棵树增高h,花费为h*h. 操作完毕后连线,两棵树间花费为高度差*定值c. 求两种花费加和最小值. 题解: 跟NOIP2014 D1T3非常像. 暴力动规是O(1*10^9)会T 所以单调队列一下,每颗树扫两遍结束. 完事,看水代码吧. #include <cstdio> #include <cstring> #include <iostream> #include <algorithm> #define N 101…

1703: [Usaco2007 Mar]Ranking the Cows 奶牛排名 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 323  Solved: 238[Submit][Status][Discuss] Description     农夫约翰有N(1≤N≤1000)头奶牛,每一头奶牛都有一个确定的独一无二的正整数产奶率．约翰想要让这些奶牛按产奶率从高到低排序．    约翰已经比较了M(1≤M≤10000)对奶牛的产奶率,但他发现,他还需…

USACO 2006 November Gold Corn Fields 题目描述: Farmer John has purchased a lush new rectangular pasture composed of M by N square parcels. He wants to grow some yummy corn for the cows on a number of squares. Regrettably, some of the squares are infertil…

NC25043 [USACO 2007 Jan S]Protecting the Flowers 题目 题目描述 Farmer John went to cut some wood and left \(N (2 ≤ N ≤ 100,000)\) cows eating the grass, as usual. When he returned, he found to his horror that the cluster of cows was in his garden eating hi…

NC25025 [USACO 2007 Nov G]Sunscreen 题目 题目描述 To avoid unsightly burns while tanning, each of the \(C\) (\(1 ≤ C ≤ 2500\)) cows must cover her hide with sunscreen when they're at the beach. Cow \(i\) has a minimum and maximum \(SPF\) rating (\(1 ≤ minS…

USACO 2014 MARCH 一.题目概览 中文题目名称 农田灌溉 懒牛 牛叫 英文题目名称 irrigation lazy mooomoo 可执行文件名 irrigation lazy mooomoo 输入文件名 irrigation.in lazy.in mooomoo.in 输出文件名 irrigation.out lazy.out mooomoo.out 每个测试点时限 1秒 1秒 1秒 测试点数目 10 10 10 每个测试点分值 10 10 10 比较方式 全文比较 全文比较 全…

Ranking the cows Description Each of Farmer John's N cows (1 ≤ N ≤ 1,000) produces milk at a different positive rate, and FJ would like to order his cows according to these rates from the fastest milk producer to the slowest. FJ has already compared…

Link: USACO 2018 Feb Gold 传送门 A: $dp[i][j][k]$表示前$i$个中有$j$个0且末位为$k$的最优解 状态数$O(n^3)$ #include <bits/stdc++.h> using namespace std; #define X first #define Y second typedef long long ll; typedef pair<int,int> P; ,INF=<<; int n,dat[MAXN],dp…