题目链接 http://poj.org/problem?id=3253 题目描述 大意:切长度为a的木条的花费是a,给定最终切好的n段各自的长度,问由原来的一根木条(长度为n段长度和)以最终总花费最小的方法切这n-1下,输出最小花费.(切的中间过程产生的子段不同,所以花费会不同) 例子: 输入: 3 8 5 8 输出: 34 提示: (8+5)+(13+8)=34 题解 过程反着想,就是合并子段的过程. 数据结构:两个单调递增队列. 第一个放进原始的n段的长度. 第二个用来放合并后的段的长度.…

Fence Repair Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 51411   Accepted: 16879 Description Farmer John wants to repair a small length of the fence around the pasture. He measures the fence and finds that he needs N (1 ≤ N ≤ 20,000)…

poj 1821 Fence \(solution:\) 这道题因为每一个粉刷的人都有一块"必刷的木板",所以可以预见我们的最终方案里的粉刷匠一定是按其必刷的木板的顺序排列的.这就提示了我们可以用线性 $ DP $,只需要将粉刷匠按必刷的木板排序即可. 设 $F[ $ i $ ][j]$ 表示前 $ i $ 个粉刷匠刷了前 $ j $ 快木板的最大收益(可以有木板不刷!).我们可以根据题意列出转移方程: 首先这个粉刷匠一块木板也不刷 这块木板不刷 这个粉刷匠从第k块木板刷到第 $ j…

[poj1821]Fence 有 N 块木板从左至右排成一行,有 M 个工匠对这些木板进行粉刷,每块木板至多被粉刷一次.第 i 个工匠要么不粉刷,要么粉刷包含木板 Si 的,长度不超过Li 的连续一段木板,每粉刷一块木板可以得到 Pi 的报酬.求如何安排能使工匠们获得的总报酬最多. 1<=N<=16000,1<=M<=100 输入 NK L1 P1 S1 L2 P2 S2 ... LK PK SK 输出 输出包含一个整数,即最大总收入. 样例输入: 8 4 3 2 2 3 2 3…

Fence Repair Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 32916   Accepted: 10638 点我 Description Farmer John wants to repair a small length of the fence around the pasture. He measures the fence and finds that he needs N (1 ≤ N ≤ 20,0…

Fence Repair Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 67319   Accepted: 22142 Description Farmer John wants to repair a small length of the fence around the pasture. He measures the fence and finds that he needs N (1 ≤ N ≤ 20,000)…

题意: 由k(1 <= K <= 100)个工人组成的团队应油漆围墙,其中包含N(1 <= N <= 16 000)个从左到右从1到N编号的木板.每个工人i(1 <= i <= K)应该坐在木板Si的前面,并且他只能喷涂一个紧凑的间隔(这意味着该间隔中的木板应该是连续的).此间隔应包含Si木板.同样,工人最多涂li个木板,每涂一块木板他应得到Pi $(1 <= Pi <= 10000).一块木板最多只能由一个工人涂油漆.所有数字Si应该是不同的. 作为团队的…

http://poj.org/problem?id=3253 Farmer John wants to repair a small length of the fence around the pasture. He measures the fence and finds that he needs N (1 ≤ N ≤ 20,000) planks of wood, each having some integer length Li (1 ≤ Li ≤ 50,000) units. He…

题目描述: Farmer John wants to repair a small length of the fence around the pasture. He measures the fence and finds that he needs N (1 ≤ N ≤ 20,000) planks of wood, each having some integer length Li (1 ≤ Li ≤ 50,000) units. He then purchases a single…

Description Farmer John wants to repair a small length of the fence around the pasture. He measures the fence and finds that he needs N (1 ≤ N ≤ 20,000) planks of wood, each having some integer length Li (1 ≤ Li ≤ 50,000) units. He then purchases a s…