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继承和组合、抽象类和接口
继承和组合的使用原则:     1、很多资料中提到的一点,如果两个类之间是is-a的关系,那么就使用继承,而如果是has-a的关系就使用组合。        但是这也不是代表is-a是使用继承的绝对理由,有时候为了消除继承关系带来的耦合,使用组合可以更好的实现封装细节。        如果在一个系统中大量应用继承,继承层次深了,那么会给系统的开发和维护带来困难。     2、无论何时,如果...
分类:其他好文   时间:2014-05-15 01:38:59    阅读次数:240
hdu4455之树状数组+DP
Substrings Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1571    Accepted Submission(s): 459 Problem Description XXX has an arra...
分类:其他好文   时间:2014-05-15 01:35:46    阅读次数:338
Series Determination
Series Determination                                                                       题目描述 Boudreaux and Thibodeaux aren't very good at math, so they need you to write a program that can de...
分类:其他好文   时间:2014-05-15 01:28:56    阅读次数:313
LeetCode--Linked List Cycle
Linked List Cycle  Total Accepted: 17148 Total Submissions: 49300My Submissions Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra sp...
分类:其他好文   时间:2014-05-15 00:13:50    阅读次数:279
【LeetCode】Linked List Cycle
Linked List CycleGiven a linked list, determine if it has a cycle in it.Follow up:Can you solve it without using extra space?做完Linked List Cycle II在做这...
分类:其他好文   时间:2014-05-14 23:30:00    阅读次数:399
插入排序
插入排序是最基本基于比较的排序方法,其时间复杂度为Ο(n2),最好情况为初始有序,最坏为逆序。 伪代码如下: insertionSort(A,n) for i=1 to n do key=A[i] for j=i-1 to 0 if ar...
分类:其他好文   时间:2014-05-14 22:35:28    阅读次数:326
Pat(Advanced Level)Practice--1043(Is It a Binary Search Tree)
Pat1043代码题目描述:A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties:The left subtree of a node contain...
分类:其他好文   时间:2014-05-14 22:03:25    阅读次数:487
LeetCode 008 String to Integer (atoi)
【题目】 Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases. Notes: It is intended for this problem to be s...
分类:其他好文   时间:2014-05-14 21:00:57    阅读次数:304
LeetCode 009 Palindrome Number
【题目】 Determine whether an integer is a palindrome. Do this without extra space. 【题意】 题意判断一个整数是否是回文数 注意一下几点: 1. 不能用额外的空间 2. 负数不是回文数...
分类:其他好文   时间:2014-05-14 20:31:10    阅读次数:298
MongoDB---出现no write has been done on this connection解决方案
出现no write has been done on this connection解决方案...
分类:数据库   时间:2014-05-14 19:42:51    阅读次数:403
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