问题描述 The competitors of Bubble Cup X gathered after the competition and discussed what is the best way to get to know the host country and its cities. After exploring the map of Serbia for a while, the competitors came up with the following facts: th…

题目描述 给定一张 \(V\) 个点,\(M\) 条边的边带权无向图,有 \(N\) 个人分布在图上的点上,第 \(i\) 个人在 \(x_i\) 这个点上,定义从一个点走到另一个点的时间为所走的路径上所有边权之和,问至少过多久才可以满足至少有 \(K\) 个点上有人. 数据范围: \(1\le V \le600,1\le E \le 20000,1\le N \le\min(V,200),1\le K \le N\) 基本思路 首先可以二分答案. 对于当前二分到的 \(mid\),我们对于每一…

这个题首先一眼能看出二分答案…… 毕竟连可爱的边界都给你了. 下面就是怎么check 首先预处理跑一遍floyed,预处理出最短路. 用网络流判断能否达到即可. #include<bits/stdc++.h> typedef long long ll; ; ; ; using namespace std; inline int read(){ ,x=;char ch; ;}'); +ch-'); return f*x; } namespace MaxFlow{ struct Edge{int…

题目链接:http://codeforces.com/problemset/problem/852/D 题目大意: 有V个点,N个队伍,E条边,经过每条边有个时间,告诉你初始N个队伍的位置,求至少有K个队伍在不同的点的最短时间 题解: 我们二分答案时间,显然具有单调性.先floyd预处理两点之间的最短路,二分答案后把每个人和他可以走到的点连起来,跑一次最大匹配.若最大匹配数大于等于k,说明当前答案小了,否则大了 (每个匹配相等于一个人和他最终去的位置) #include<algorithm>…

Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 6558   Accepted: 2644 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploration? Have you ever explored…

Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 8193   Accepted: 3358 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploration? Have you ever explored treasure? If you neve…

http://poj.org/problem?id=2594 Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 7398   Accepted: 3025 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure explo…

Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 7455   Accepted: 3053 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploration? Have you ever explored…

Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 8550   Accepted: 3495 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploration? Have you ever explored…

I joined Analytics Vidhya as an intern last summer. I had no clue what was in store for me. I had been following the blog for some time and liked the community, but did not know what to expect as an intern. The initial few days were good – all the in…

传送门:http://poj.org/problem?id=2594 Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 9802   Accepted: 3979 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure e…

Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 9794   Accepted: 3975 题目链接:http://poj.org/problem?id=2594 Description: Have you ever read any book about treasure exploration? Have you ever see any film about treasure…

Treasure Exploration Time Limit:6000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Practice POJ 2594 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploratio…

Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 8301   Accepted: 3402 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploration? Have you ever explored…

Treasure Exploration Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploration? Have you ever explored treasure? If you never have such experiences, you would never know what fun treasure exploring…

Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 8130   Accepted: 3325 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploration? Have you ever explored…

点击打开链接题目链接 Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 7215   Accepted: 2947 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploration? Have you eve…

Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploration? Have you ever explored treasure? If you never have such experiences, you would never know what fun treasure exploring brings to you.Recentl…

题目链接:http://poj.org/problem?id=2594 Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions:10480   Accepted: 4250 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure…

测试计划(Test Plan) 版权声明:本文为博主原创文章,未经博主允许不得转载. 测试计划的概念: 测试计划是一个文档,描述了进行测试的测试范围,测试策略和方法,测试资源和进度.是对整个测试活动进行的一个宏观的规划,确定了测试项目,测试任务,谁来执行任务,被测试特性,不被测试特性以及过程中可能存在的风险等.测试计划能够有效的预防计划的风险,保证了测试活动能够在计划范围内顺利的开展. 测试计划的目的:             ①制定一个可行性的计划,包括测试对象,测试范围,测试方法和策略,测试…

1.explain plan的使用 SQL> explain plan for delete from t_jingyu; Explained. SQL> select * from table(dbms_xplan.display); PLAN_TABLE_OUTPUT ----------------------------------------------------------------------------------------------------------------…

Evacuation Plan Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 4617   Accepted: 1218   Special Judge Description The City has a number of municipal buildings and a number of fallout shelters that were build specially to hide municipal w…

很久无写过blogs,荒废得差不多了,在博客园虽开bolg 5年多,但由于自己工作的问题,从开始的热情记录,到冷却冰冻,再到现在重拾起来,有一番感受:从大学刚毕业的制作网页菜鸟,开始接触DIV,CSS,flex等前端和后端的杂碎,正所谓“页面仔”样样识,无样掂!再到由于家庭原因,回到家乡转做了类似硬件的网管一年多,再到现在做了工厂类似工厂ERP维护,还是与软件程序打交道.为了扎扎实实地提高自己本人的技术水平,现在重拾写Blog plan,希望借此来提高自己前端和后端技术水平. Plan 如下:…

基于oracle的应用系统很多性能问题,是由应用系统sql性能低劣引起的,所以,sql的性能优化很重要,分析与优化sql的性能我们一般通过查看该sql的执行计划,本文就如何看懂执行计划,以及如何通过分析执行计划对sql进行优化做相应说明. 一.什么是执行计划(explain plan) 执行计划:一条查询语句在oracle中的执行过程或访问路径的描述. 二.如何查看执行计划 1.set autotrace on 2.explain plan for sql语句; select plan_tabl…

转自:http://blog.chinaunix.net/uid-21187846-id-3022916.html       如果要分析某条SQL的性能问题,通常我们要先看SQL的执行计划,看看SQL的每一步执行是否存在问题. 如果一条SQL平时执行的好好的,却有一天突然性能很差,如果排除了系统资源和阻塞的原因,那么基本可以断定是执行计划出了问题.看懂执行计划也就成了SQL优化的先决条件.这里的SQL优化指的是SQL性能问题的定位,定位后就可以解决问题. 查看执行计划的三种方法 设置autot…

Explain Plan 执行计划,包含了一个SELECT(后续版本支持UPDATE等语句)的执行 主要字段 id 编号,从1开始,执行的时候从大到小,相同编号从上到下依次执行. Select_type SIMPLE 简单查询 PRIMARY 最外层查询 SUBQUERY 子查询 DEPENDENT SUBQUERY:  取决于外层查询的子查询 UNION:  UNION子句右侧的SELECT子句 type system表仅有一行(=系统表).这是const联接类型的一个特例. const表最多…

http://acm.timus.ru/problem.aspx?space=1&num=1982 1982. Electrification Plan Time limit: 0.5 secondMemory limit: 64 MB Some country has n cities. The government has decided to electrify all these cities. At first, power stations in k different cities…

From http://blog.csdn.net/wujiandao/article/details/6621073 1. Four ways to get execution plan(anytime you want, for specified sql) • Execute the SQL statement EXPLAIN PLAN, and then query the table where the output was written. • Query a dynamic per…

Arpa's loud Owf and Mehrdad's evil plan time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output As you have noticed, there are lovely girls in Arpa's land. People in Arpa's land are numbered from 1…

在调优过程中的查询语句优化阶段,分析语句的执行计划是必经之路,一款好的执行计划分析工具确实可以帮助我们事半功倍 小贴士:Plan Explorer是将Plan Explorer 专业版与免费版整合在一起发布的全新.完全免费版.微软的数据库专家和开发人员也在用哦.现在,整个功能集全免费的,对于DBA来说,福利啊! Plan Explorer主要功能介绍: 1. 通过执行计划表格或图形形式,快速定位存储过程中的哪个语句Statement使用总资源最多(百分比),IO读写的比较多(线的粗细). 2.…