n<=400个东西,每个东西有高度<=100,这种东西在堆放过程中不得超过的最大高度<=40000,以及每个东西的个数<=10,求最高能堆多高. 算了下背包复杂度不太对然后开了bitset.. #include<stdio.h> #include<string.h> #include<stdlib.h> #include<algorithm> #include<bitset> //#include<iostream&…

题目 1739: [Usaco2005 mar]Space Elevator 太空电梯 Time Limit: 5 Sec  Memory Limit: 64 MB Description The cows are going to space! They plan to achieve orbit by building a sort of space elevator: a giant tower of blocks. They have K (1 <= K <= 400) differe…

P6771 这是一道很明显的 dp 问题. 首先 dp 最重要的三要素是:动态表示.动态转移.初始状态. 只要这三个要素搞明白了,基本就能把这题做出来了. solution 让我们来看看这题的动态表示.动态转移和初始状态. 状态表示: \(dp_{i,j}\) 表示用前 \(i\) 种方块是否可以拼成高度 \(j\) 状态转移: \( dp_{i,j}= \begin{cases}\\\\\\\\\\\end{cases} \begin{matrix} dp_{i-1,j} && \tex…

Description The cows are going to space! They plan to achieve orbit by building a sort of space elevator: a giant tower of blocks. They have K (1 <= K <= 400) different types of blocks with which to build the tower. Each block of type i has height h…

1680: [Usaco2005 Mar]Yogurt factory Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 106  Solved: 74[Submit][Status][Discuss] Description The cows have purchased a yogurt factory that makes world-famous Yucky Yogurt. Over the next N (1 <= N <= 10,000)…

Description The cows are going to space! They plan to achieve orbit by building a sort of space elevator: a giant tower of blocks. They have K ( <= K <= ) different types of blocks with which to build the tower. Each block of type i has height h_i (…

一道水题WA了这么多次真是.... 统考终于完 ( 挂 ) 了...可以好好写题了... 先floyd跑出各个点的最短路 , 然后二分答案 m , 再建图. 每个 farm 拆成一个 cow 点和一个 shelter 点, 然后对于每个 farm x : S -> cow( x ) = cow( x ) 数量 , shelter( x ) -> T = shelter( x ) 容量 ; 对于每个dist( u , v ) <= m 的 cow( u ) -> shelter( v…

A - Space Elevator Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Description The cows are going to space! They plan to achieve orbit by building a sort of space elevator: a giant tower of blocks. They have…

1740: [Usaco2005 mar]Yogurt factory 奶酪工厂 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 119  Solved: 100[Submit][Status][Discuss] Description The cows have purchased a yogurt factory that makes world-famous Yucky Yogurt. Over the next N (1 <= N <= 10…

1682: [Usaco2005 Mar]Out of Hay 干草危机 Time Limit: 5 Sec  Memory Limit: 64 MBSubmit: 391  Solved: 258[Submit][Status] Description The cows have run out of hay, a horrible event that must be remedied immediately. Bessie intends to visit the other farms…