[BZOJ3312][Usaco2013 Nov]No Change Description Farmer John is at the market to purchase supplies for his farm. He has in his pocket K coins (1 <= K <= 16), each with value in the range 1..100,000,000. FJ would like to make a sequence of N purchases…

题目描述 Farmer John is at the market to purchase supplies for his farm. He has in his pocket K coins (1 <= K <= 16), each with value in the range 1..100,000,000. FJ would like to make a sequence of N purchases (1 <= N <= 100,000), where the ith p…

题意: K个硬币,要买N个物品.K<=16,N<=1e5 给定买的顺序,即按顺序必须是一路买过去,当选定买的东西物品序列后,付出钱后,货主是不会找零钱的.现希望买完所需要的东西后,留下的钱越多越好,如果不能完成购买任务,输出-1 =>K那么小...那么我们可以想到二进制枚举状态...然后转移...好像算不上状压dp吧...时间复杂度O(K2^Klogn) #include<cstdio> #include<cstring> #include<cctype&g…

Description 约翰带着 N 头奶牛在超市买东西,现在他们正在排队付钱,排在第 i 个位置的奶牛需要支付 Ci元.今天说好所有东西都是约翰请客的,但直到付账的时候,约翰才意识到自己没带钱,身上只有 K张消费卡,第 i 张卡里有 Vi 元余额. 问题是,这些消费卡都是一次性的,它们可以被收银机读取,但如果卡一旦离开了收银机,卡里的余额就会归零,而且超市也不负责找零!奶牛的队伍很长,不可能再调整她们的位置了,所以一张卡只能支付一段连在一起的账单.而且,一张账单只能用一张消费卡支付,超市的系统…

传送门 先通过二分预处理出来,每个硬币在每个商品处最多能往后买多少个商品 直接状压DP即可 f[i]就为,所有比状态i少一个硬币j的状态所能达到的最远距离,在加上硬币j在当前位置所能达到的距离,所有的取max 是满足最优解性质的 #include <cstdio> #include <iostream> #include <algorithm> #define N 17 #define max(x, y) ((x) > (y) ? (x) : (y)) int n…

Problem Description Rompire is a robot kingdom and a lot of robots live there peacefully. But one day, the king of Rompire was captured by human beings. His thinking circuit was changed by human and thus became a tyrant. All those who are against him…

Description Farmer John is at the market to purchase supplies for his farm. He has in his pocket K coins (1 <= K <= 16), each with value in the range 1..100,000,000. FJ would like to make a sequence of N purchases (1 <= N <= 100,000), where th…

问题描述 https://www.luogu.org/problem/P3092 题解 观察到 \(k \le 16\) ,自然想到对 \(k\) 状压. 设 \(opt[i]\) 代表使用硬币状况为 \(i\) 时,最多可以买到 \(opt[i]\) 个物品. 然后 \(opt[i]\) 在DP过程中二分求出. \(\mathrm{Code}\) #include<bits/stdc++.h> using namespace std; template <typename Tp>…

这个题有点意思,其实不是特别难,但是不太好想...中间用二分找最大的可买长度就行了. 题干: 题目描述 Farmer John <= K <= ), each with value ..,,. FJ would like to make a sequence of N purchases ( <= N <= ,), <= c(i) <= ,). As he makes this sequence of purchases, he can periodically sto…

[BZOJ1725][Usaco2006 Nov]Corn Fields牧场的安排 Description Farmer John新买了一块长方形的牧场,这块牧场被划分成M列N行(1<=M<=12; 1<=N<=12),每一格都是一块正方形的土地.FJ打算在牧场上的某几格土地里种上美味的草,供他的奶牛们享用.遗憾的是,有些土地相当的贫瘠,不能用来放牧.并且,奶牛们喜欢独占一块草地的感觉,于是FJ不会选择两块相邻的土地,也就是说,没有哪两块草地有公共边.当然,FJ还没有决定在哪些土地…