You are given an array A of strings. Two strings S and T are special-equivalent if after any number of moves, S == T. A move consists of choosing two indices i and jwith i % 2 == j % 2, and swapping S[i] with S[j]. Now, a group of special-equivalent…
题目要求 You are given an array A of strings. Two strings S and T are special-equivalent if after any number of moves, S == T. A move consists of choosing two indices i and j with i % 2 == j % 2, and swapping S[i] with S[j]. Now, a group of special-equiv…
题目标签:String 题目可以让在 偶数位置的 chars 互换, 也可以让 在 奇数位置的 chars 互换. 所以为了 return 正确的 group 数量,需要把 那些重复的 给排除掉. 可以把在 偶数位置的 chars 都拿出来 组成一个 string a, 同样的把 在奇数位置上的 chars 都拿出来组成一个 string b,分别把a 和 b 排序一下,再把两个a 和 b组合并且存入 HashSet. 最后只要返回 HashSet 的 size 就可以了. Java Solut…
package y2019.Algorithm.array.medium; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.array.medium * @ClassName: SortColors * @Author: xiaof * @Description: TODO 75. Sort Colors * Given an array with n objects colored red, white or blue,…
我一上来没读清题,想着这题这么简单,直接就上手写了: package leetcode.day_12_05; import java.util.ArrayList; import java.util.Comparator; import java.util.List; /** * 给定两个大小分别为 m 和 n 的正序(从小到大)数组nums1 和nums2.请你找出并返回这两个正序数组的 中位数 . * <p> * 算法的时间复杂度应该为 O(log (m+n)) . * 示例 1: * &…
原文链接:http://www.datanamic.com/support/lt-dez005-introduction-db-modeling.html Introduction to Database Design This article/tutorial will teach the basis of relational database design and explains how to make a good database design. It is a rather lon…
A. Straight «A» 题面 Noora is a student of one famous high school. It's her final year in school - she is going to study in university next year. However, she has to get an «A» graduation certificate in order to apply to a prestigious one. In school, w…
A. Straight «A» time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Noora is a student of one famous high school. It's her final year in school — she is going to study in university next year.…
A. Straight «A» time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Noora is a student of one famous high school. It's her final year in school — she is going to study in university next year.…
这次要谈的3个关键字:DAO.Model.AR,是我们在做web应用时常见的几个概念,也被称作设计模式(design pattern),先简单看看它们的全拼和中文: DAO:Data Access Object 数据访问对象 Model:数据模型 AR:Active Record 活动记录 几乎所有的web开发框架在设计的时候,都或多或少用到了这些设计模式来实现了MVC中的M层,通过为开发者提供强有力的类库,简单便捷的完成数据库访问. 很多同学对这些概念的理解相对模糊,因此下面我将通过几个例子循…