P.S. 偶然间发现可以用 markdown... [BZOJ2678][Usaco2012 Open]Bookshelf 试题描述 When Farmer John isn't milking cows, stacking haybales, lining up his cows, or building fences, he enjoys sitting down with a good book. Over the years, he has collected \(N\) books (…

[题目链接] https://www.lydsy.com/JudgeOnline/problem.php?id=2678 [算法] 首先不难想到如下DP : 记f[i]表示前i本书的高度和最小值 显然 , 有状态转移方程 : f[i] = min{ fj + max{hj+1 , hj+2 , ... hi} } 不难发现 , 当i确定时 , 随着j的减小 , max{hj + 1 , hj+2 , ... hi}的值单调递增 不妨维护一个单调递减的单调栈 预处理前缀和 , 每次在单调栈中二分出…

Search GO 说明:输入题号直接进入相应题目,如需搜索含数字的题目,请在关键词前加单引号 Problem ID Title Source AC Submit Y 1000 A+B Problem 10983 18765 Y 1036 [ZJOI2008]树的统计Count 5293 13132 Y 1588 [HNOI2002]营业额统计 5056 13607 1001 [BeiJing2006]狼抓兔子 4526 18386 Y 2002 [Hnoi2010]Bounce 弹飞绵羊 43…

nodejs mysql ORM 比node-mysql好用多了. bookshelf 支持restful功能,用到的时候研究下:https://www.sitepoint.com/getting-started-bookshelf-js/ create // Data其实是一个model new Data({ 'data_name': 'bookshelf', 'data_info': 'info', 'user_id': 1, 'add_time': '2016.07.24', 'is_de…

Bookshelf 2 Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8745   Accepted: 3974 Description Farmer John recently bought another bookshelf for the cow library, but the shelf is getting filled up quite quickly, and now the only available…

Bookshelf 2 Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Description Farmer John recently bought another bookshelf for the cow library, but the shelf is getting filled up quite quickly, and now the only a…

Bookshelf 2 Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9488   Accepted: 4311 Description Farmer John recently bought another bookshelf for the cow library, but the shelf is getting filled up quite quickly, and now the only available…

  2621: [Usaco2012 Mar]Cows in a Skyscraper Time Limit: 20 Sec  Memory Limit: 128 MBSubmit: 303  Solved: 150[Submit][Status][Discuss] Description [Mark Gordon, Neal Wu, Fatih Gelgi, 2012] A little known fact about Bessie and friends is that they love…

3016: [Usaco2012 Nov]Clumsy Cows Time Limit: 1 Sec  Memory Limit: 128 MBSubmit: 71  Solved: 52[Submit][Status] Description Bessie the cow is trying to type a balanced string of parentheses into her new laptop, but she is sufficiently clumsy (due to h…

子树操作, dfs序即可.然后计算<=L就直接在可持久化线段树上查询 ------------------------------------------------------------------- #include<bits/stdc++.h>   using namespace std;   #define M(l, r) (((l) + (r)) >> 1)   const int maxn = 200009;   typedef long long ll;  …