# thinking in java 4th# reading note# victor# 2016.02.10 chapter 1 对象入门 1.1 抽象的进步    (1) 所有东西都是对象.    (2) 程序是一大堆对象的组合,对象间通过消息联系.    (3) 通过封装现有对象,可制作出新型对象.    (4) 每个对象都有一种类型(某个类的实例).    (5) 同一类的所有对象都能接受相同的消息.    1.2 对象的接口 & 1.3 实现方法的隐藏     接口规定了可对一个特定

New Year is coming, and Jaehyun decided to read many books during 2015, unlike this year. He has n books numbered by integers from 1 to n. The weight of the i-th (1 ≤ i ≤ n) book is wi. As Jaehyun's house is not large enough to have a bookshelf, he k

题目:http://poj.org/problem?id=3320 题意:给定N个元素的数组,找出最短的一段区间使得区间里面的元素种类等于整个数组的元素种类. 分析:暴力枚举区间的起点x,然后找到最小的y,使得区间[x,y]满足条件,x向有移位后变成x',现在的y'肯定不至于在y的左边.存状态的话map和hash都可以. map代码: #include <iostream> #include <set> #include <map> #include <cstdi

Linux comes with many tools to enable administrators to evaluate the performance of a system. One of these very useful tools is vmstat. Vmstat is available on most unix distributions and is included by default on many modern Linux distributions. As w

初次接触spring mvc,想做一个小的练习项目,结果在ftl文件中引用其它的共通ftl文件时出错. 目录结构如图所示,想在login.ftl中引用common下的errormessage.ftl <#include '/WEB-INF/ftl/common/errormessage.ftl' /> 结果画面报错: FreeMarker template error: Error reading included file "/WEB-INF/ftl/common/errormes

Description Jessica's a very lovely girl wooed by lots of boys. Recently she has a problem. The final exam is coming, yet she has spent little time on it. If she wants to pass it, she has to master all ideas included in a very thick text book. The au

Learning to Compare Image Patches via Convolutional Neural Networks ---  Reading Summary 2017.03.08 Target: this paper attempt to learn a geneal similarity function for comparing image patches from image data directly. There are several ways in which

来源于:https://www.mkyong.com/java/apache-poi-reading-and-writing-excel-file-in-java/ In this article, we will discuss about how to read and write an excel file using Apache POI 1. Basic definitions for Apache POI library This section briefly describe a

环境:在VirtualBox中安装了Ubuntu虚拟机,网络使用了NAT模式,开启了端口转发. 局域网内其他计算机访问虚拟机中的MySQL Server出现两个问题: Lost connection to MySQL server at 'reading initial communication packet, system error: 0 以及 host is not allowed to connect mysql 1.解决Lost connection to MySQL server

题意:有n页书,每页有个编号为ci的知识点,求最小看连续的页数,其中包括所有的知识点 分析:n<=1e6,只能搞O(n)的解法,无非就是枚举起点和终点,尺取法正好适合这个想法,枚举一个起点,然后往后扫描到区间内包括所有的知识点,然后每次起点都往右移动一次,直到扫描到右边界也没有答案了,就跳出 程序跑了469ms,应该是map太慢,可以hash搞一波,也过了,但是可以离散化知识点的编号,最多有1e6个,空间换时间 #include<iostream> #include<cstdio&