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…

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 space is at the top. FJ has N cows (1 ≤ N ≤ 20) each with some height of Hi (1 ≤ Hi ≤ 1,000,00…

NodeJs 关系数据库ORM库:Bookshelf.js bookshelf.js是基于knex的一个关系型数据库的ORM库.简单易用,内置了Promise的支持.这里主要罗列一些使用的例子,例子就是最好的教程.下面就是用mysql作为实例数据库表明bookshelf如何使用.其他的几个关系型数据库使用上基本一致,只是配置等地方需要使用的名称各自不同.为了更加贴近实际全部的例子都会放在Express打造的RESTful服务里. 安装bookshelf和knex 首先需要安装库knex和book…

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 space is at the top. FJ has N cows (1 ≤ N ≤ 20) each with some height of Hi (1 ≤ Hi ≤ 1,000,00…

L is a rather sluttish guy. He almost never clean up his surroundings or regulate his personal goods, and often can't find them at need. What's worse, due to his power of impact in his dorm, not only is he himself sluttish, but he also spreads the ha…

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 space is at the top. FJ has N cows (1 ≤ N ≤ 20) each with some height of Hi (1 ≤ Hi ≤ 1,000,00…

书架 bookshelf 题目描述 当Farmer John闲下来的时候,他喜欢坐下来读一本好书. 多年来,他已经收集了N本书 (1 <= N <= 100,000). 他想要建立一个多层书架,来存放它们. 每本书 i 拥有一个宽度 W(i)和一个高度 H(i). 所有的书需要按顺序,放到书架的每一层. 举例来说,第一层书架放k本书,应该放书1...k:第二层书架从第k+1本书开始放……. 每层书架的宽度最多为L (1 <= L <= 1,000,000,000). 每层书架的高度…

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:http://codeforces.com/contest/294/problem/B B. Shaass and Bookshelf time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Shaass has n books. He wants to make a bookshelf for all his books.…

Shaass has n books. He wants to make a bookshelf for all his books. He wants the bookshelf's dimensions to be as small as possible. The thickness of the i-th book is ti and its pages' width is equal to wi. The thickness of each book is either 1 or 2.…

传送门1:http://www.usaco.org/index.php?page=viewproblem2&cpid=138 传送门2:http://www.lydsy.com/JudgeOnline/problem.php?id=2678 最开始没看到要将那些书按顺序放!!一定是按顺序!我还以为是自己安排那个书架,白费了我好久时间. 然而看对题之后仍然不会... 令f(i)表示前i本书已经放到书架上,且第i本是某个书架的最后一本的最小高度和,则 f(i) = min { f(j) + max…

题目链接:Bookshelf 2(点击进入) 题目解读: 给n头牛,给出每个牛的高度h[i],给出一个书架的高度b(所有牛的高度相加>书架高度b),现在把一些牛叠起来(每头牛只能用一次,但不同的牛可能身高相同),在这些叠起来的牛的总高度>书架b的基础上,找出最小的差距(由于输入的数据会保证所有牛的高度相加>书架高度b,所以差距不为负) 还是看不懂题目? 举个栗子: 现在有五头牛高度分别为3 1 3 5 6,书架高度b=16,我们可以把五头牛都叠起来,总高度为18,差距为18-16=2,但…

最近有一本2千多页的在VitalSource中的电子书想转为PDF随时阅读,没料网上找了一圈没有找到合适的.相对好一些的只有一个用Python写的模拟手动打印.于是想到了用AutoHotkey写一个自动打印脚本来转成PDF电子书. 工具: Windows 10 Professional - 自带Microsoft to PDF(打印后不用自动打开文件) AutoHotkey Version 1.1.30.03 - https://www.autohotkey.com/ VitalSource B…

Bookshelf 2 Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 7496   Accepted: 3451 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…

题目描述: B. Shaass and Bookshetime limit per test    2 secondsmemory limit per test 256 megabytesinput   standard inputoutput  standard output Shaass has n books. He wants to make a bookshelf for all his books. He wants the bookshelf's dimensions to be…

Bookshelf 2 Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 11105   Accepted: 4928 Description Farmer John recently bought another bookshelf for the cow library, but the shelf is getting filled up quite quickly, and now the only availabl…

B - Bookshelf 2 Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%lld & %llu 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…

Farmer John recently bought another bookshelf for the cow library, but the shelf is getting filled up quite quickly, and now the only available space is at the top. FJ has N cows (1 ≤ N ≤ 20) each with some height of Hi (1 ≤ Hi ≤ 1,000,000 - these ar…

链接:https://ac.nowcoder.com/acm/contest/993/C来源:牛客网 题目描述 Farmer John recently bought another bookshelf for the cow library, but the shelf is getting filled up quite quickly, and now the only available space is at the top. FJ has N cows (1 <= N <= 20)…

Bookshelf Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 7758   Accepted: 3906 Description Farmer John recently bought a bookshelf for cow library, but the shelf is getting filled up quite quickly, and now the only available space is at…

2021.12.08 P1848 [USACO12OPEN]Bookshelf G(线段树优化DP) https://www.luogu.com.cn/problem/P1848 题意: 当农夫约翰闲的没事干的时候,他喜欢坐下来看书.多年过去,他已经收集了 N 本书 (1 <= N <= 100,000), 他想造一个新的书架来装所有书. 每本书 i 都有宽度 W(i) 和高度 H(i).书需要按顺序添加到一组书架上:比如说,第一层架子应该包含书籍1 ... k,第二层架子应该以第k + 1本…

http://codeforces.com/contest/294/problem/B 据说是贪心,我用了一个复杂度是2e8的dp水过去了. 其实这题就是给你n个数,每个数有两个权值,分成两组,使得第一个权值之和,和第二个权值之和的最大值最小. 那么直接设dp[i][j][k][h]表示前i个数中,选了j个,第一个权值的和是k,第二个权值是h,是否可能. 这里是一定要选出n个的,就是n个数都必须使用,才能滚动数组.(把第二维滚动) 如果是从n个数中选出k个,那么就不能滚动了. 那么第一维是01背…

题目 记忆化搜索(深搜+记录状态) 感谢JLGG //记忆话搜索 //一本书2中状态,竖着放或者横着放 //初始先都竖着放,然后从左边往右边扫 #include<stdio.h> #include<string.h> #include<algorithm> using namespace std; ][][];//dp[第几个][厚度][宽度] int n; ],b[]; int rec(int i,int th,int w) { )return dp[i][th][w…

题意:给出n头牛的身高,以及一个书架的高度,问怎样选取牛,使得它们的高的和超过书架的高度最小. 将背包容量转化为所有牛的身高之和,就可以用01背包来做=== #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #define maxn 2000005 using namespace std; ]; int main() { ,tmp=; scanf("%…

题目大意 给你N本书,每本书由一个厚度t[i](1或者2),宽度w[i],高度都是一样,把一些书竖着放,然后一些书横着放在同一层,就像下图那样放: 问你把所有的书放好之后竖着的书的总厚度是多少? 题解 题目有个重要条件,那就是每本书的厚度要么为1要么为2,因此我们可以根据书的厚度分为两类,然后每类按书的宽度从大到小排序,然后用二重循环进行枚举,把厚度为1的前i个和厚度为2的前j个竖着放,其他的横着放,在横着放的总宽度不超过竖着放的总厚度的前提下,求出一个竖着放总厚度最小的值来,这就是最终答案,为…

http://poj.org/problem?id=3628 01背包 #include <cstdio> #include <iostream> #include <cstring> #include <algorithm> #define maxn 21 #define ll long long using namespace std; ll h[maxn]; int n; ll b; ll dp[]; ll max1(ll a,ll b) { retu…

这道题目的意思就是排两排书,下面这排只能竖着放,上面这排可以平着放,使得宽度最小 根据题意可以得出一个结论,放上这排书的Width 肯定会遵照从小到大的顺序放上去的 Because the total thickness of vertical books is fixed it's good to calculate the minimum possible total width of horizontal books. 那么只需要模拟一遍放书的过程即可,不会TLE 不过正统解法是Dp Dp…