part 1 暴力 不难发现有一个 $\mathcal O(K^2n)$ 的基础 dp: $$f_{i,j+l}=\min(f_{i,j+l},f_{i-1,j}+(x_i-x_{i-1})\times j\times j+c_i\times l);$$ 这其中 $f$ 代表在第 $i$ 个点已经买了 $j+l$ 个,其中当前第 $i$ 个点买了 $l$ 个,前 $i-1$ 个点买了 $j$ 个的最小价值. 这样的话可以水到 90pts,但是如果是联赛的话应该没有这么高的暴力分. code #i…

part 1 暴力 不难发现有一个 $\mathcal O(K^2n)$ 的基础 dp: $$f_{i,j+l}=\min(f_{i,j+l},f_{i-1,j}+(x_i-x_{i-1})jj+c_i*l)$$ 这其中 f 代表在第 i 个点已经买了 j+l 个,其中当前第 i 个点买了 l 个,前 i-1 个点买了 j 个的最小价值. 这样的话可以水到 $90pts$,但是如果是联赛的话应该没有这么高的暴力分. code #include<bits/stdc++.h> #define in…

BUYING FEED 时间限制:3000 ms  |  内存限制:65535 KB 难度:4   描述 Farmer John needs to travel to town to pick up K (1 <= K <= 100)pounds of feed. Driving D miles with K pounds of feed in his truck costs D*K cents. The county feed lot has N (1 <= N<= 100) s…

2020: [Usaco2010 Jan]Buying Feed, II Time Limit: 3 Sec  Memory Limit: 64 MBSubmit: 220  Solved: 162[Submit][Status] Description (buying.pas/buying.in/buying.out 128M 1S) Farmer John needs to travel to town to pick up K (1 <= K <= 100) pounds of feed…

Problem F: F BUYING FEED Description Farmer John needs to travel to town to pick up K (1 <= K <= 100)pounds of feed. Driving D miles with K pounds of feed in his truck costs D*K cents. The county feed lot has N (1 <= N <= 100) stores (convenie…

洛谷 P2616 [USACO10JAN]购买饲料II Buying Feed, II https://www.luogu.org/problemnew/show/P2616 题目描述 Farmer John needs to travel to town to pick up K (1 <= K <= 100) pounds of feed. Driving D miles with K pounds of feed in his truck costs D*K cents. The cou…

洛谷 P2616 [USACO10JAN]购买饲料II Buying Feed, II 洛谷传送门 JDOJ 2671: USACO 2010 Jan Silver 2.Buying Feed, II JDOJ传送门 Description Farmer John needs to travel to town to pick up K (1 <= K <= 100) The county feed lot has N (1 <= N <= 100) stores (conveni…

P2616 [USACO10JAN]购买饲料II Buying Feed, II 题目描述 Farmer John needs to travel to town to pick up K (1 <= K <= 100) pounds of feed. Driving D miles with K pounds of feed in his truck costs D*K cents. The county feed lot has N (1 <= N <= 100) stores…

额,直接思路就dp吧.(我还想了想最短路之类的233但事实证明不行2333.....) 直入主题: 化简题意:在x轴上有n个点,坐标为xi.从原点出发,目标点为e,在途中需要收集K重量的物品,在每个点有收集的上限和单价,路费是当前已收集重量*距离,求最小值. 首先,最暴力的方程式很好推(普及难度),枚举当前点,当前点总重量,nk^2的复杂度(25 0000 0000 233.....)于是直接gg. 所以,方程式: dp[i][j]=min(dp[i-][p]+dis[i] j^+w[i-] (…

题目描述 约翰开车来到镇上,他要带 KKK 吨饲料回家.运送饲料是需要花钱的,如果他的车上有 XXX 吨饲料,每公里就要花费 X2X^2X2 元,开车D公里就需要 D×X2D\times X^2D×X2 元.约翰可以从 NNN 家商店购买饲料,所有商店都在一个坐标轴上,第 iii 家店的位置是 XiX_iXi​ ,饲料的售价为每吨 CiC_iCi​ 元,库存为 FiF_iFi​ . 约翰从坐标 X=0X=0X=0 开始沿坐标轴正方向前进,他家在坐标 X=EX=EX=E 上.为了带 KKK 吨饲料…