题目链接 动态规划转化成 DAG 然后拓扑求解的思路 虽然很简单不过感觉这个新思路会很有用! 如果两个事件互不影响并且有先后关系,就可以连一条有向边,跑最长路可以得到最后的最优解 实际上这还是个背包…… #include <queue> #include <cstdio> #include <cctype> #include <cstring> #include <iostream> #include <algorithm> usin…

P2889 [USACO07NOV]挤奶的时间Milking Time 奶牛Bessie在0~N时间段产奶.农夫约翰有M个时间段可以挤奶,时间段f,t内Bessie能挤到的牛奶量e.奶牛产奶后需要休息R小时才能继续下一次产奶,求Bessie最大的挤奶量. 错误日志: dp[i]转移的设计强制选择了第 i 个(自己还没发现)[然后后面发现又有问题唉] Solution 先把 \(R\) 累积到右端点中, 排序 设 \(dp[i]\) 为考虑前 \(i\) 个区间, 第 \(i\) 个区间必选的最大…

P2889 [USACO07NOV]挤奶的时间Milking Time 普通的dp 休息时间R其实就是把结束时间后移R个单位而已.但是终点也需要后移R位到n+R. 每个时间段按起始时间排序,蓝后跑一遍普通的线性dp即可 注意起点是0 (班主任十分显然地拒绝了我的晚自习机房计划,毕竟是退役OIer) #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> using n…

Luogu P2889 [USACO07NOV]挤奶的时间Milking Time 题目描述 传送门Bessie is such a hard-working cow. In fact, she is so focused on maximizing her productivity that she decides to schedule her next N (1 ≤ N ≤ 1,000,000) hours (conveniently labeled 0..N-1) so that she…

https://daniu.luogu.org/problemnew/show/2889 按右端点从小到大排序后DP dp[i] 到第i个时间段的最大产奶量 不能按左端点排序,第i段由第j段更新时,第j段可能没挤奶,i,j都处于第k(k<j)段之后的休息时间 #include<cstdio> #include<iostream> #include<algorithm> using namespace std; #define N 1001 int dp[N]; s…

Secret Milking Machine Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 11865   Accepted: 3445 Description Farmer John is constructing a new milking machine and wishes to keep it secret as long as possible. He has hidden in it deep within…

Milking Cows Three farmers rise at 5 am each morning and head for the barn to milk three cows. The first farmer begins milking his cow at time 300 (measured in seconds after 5 am) and ends at time 1000. The second farmer begins at time 700 and ends a…

                                                        Milking Grid Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 7153   Accepted: 3047 Description Every morning when they are milked, the Farmer John's cows form a rectangular grid tha…

Optimal Milking Time Limit: 2000MS Memory Limit: 30000K Total Submissions: 13968 Accepted: 5044 Case Time Limit: 1000MS Description FJ has moved his K (1 <= K <= 30) milking machines out into the cow pastures among the C (1 <= C <= 200) cows.…

                                         Optimal Milking Time Limit: 2000MS   Memory Limit: 30000K Total Submissions: 16461   Accepted: 5911 Case Time Limit: 1000MS Description FJ has moved his K (1 <= K <= 30) milking machines out into the cow past…