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projecteuler---->problem=7----10001st prime
title: By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13. What is the 10 001st prime number? 翻译: 通过列出前6个质数,我们可知第6个质数是13。 那么第10001个质数是...
分类:其他好文   时间:2014-06-05 12:28:28    阅读次数:277
hdu 1016 Prime Ring Problem (dfs)
一切见注释。 #include #include #include #include using namespace std; bool vis[22]; int n; int ans[22]; int top; bool isprime(int x)//判断素数 { for(int i=2;i<x;i++) if(x%i==0)return false; ...
分类:其他好文   时间:2014-06-05 08:26:47    阅读次数:201
oracle命令
Oracle sqlplus报表的实现 备份数据库 非归档  :要关闭数据库 归档: Oracle中只有date,没有datatime sys/sorry as sysdba          sys系统管理员,权限最大 show user查看当前登录数据库的用户 1.安装选择host-ONLY...
分类:数据库   时间:2014-06-05 06:20:26    阅读次数:330
Validate Binary Search Tree
Given a binary tree, determine if it is a valid binary search tree (BST).Assume a BST is defined as follows:The left subtree of a node contains only n...
分类:其他好文   时间:2014-06-03 14:00:56    阅读次数:281
Spring/Hibernate Improved SQL Logging with log4jdbc---reference
Hibernate provides SQL logging out of the box, but such logging only shows prepared statements, and not the actual SQL queries sent to the database.It...
分类:数据库   时间:2014-05-31 16:47:16    阅读次数:514
UVALIVE 6450 Social Advertising
You have decided to start up a new social networking company. Other existing popular social networksalready have billions of users, so the only way to...
分类:其他好文   时间:2014-05-31 04:34:45    阅读次数:275
CodeForces 432C Prime Swaps
DescriptionYou have an arraya[1],?a[2],?...,?a[n], containing distinct integers from1ton. Your task is to sort this array in increasing order with the...
分类:其他好文   时间:2014-05-31 01:35:23    阅读次数:318
素数筛
这是我目前知道的打素数表最快的方法了………… 差不多是O(n)的,100000以内花了0.005秒。 1 int prime[100005], np, vis[100005]; 2 3 void get_prime(int n){ 4 mset(prime); mset(vis); 5 ...
分类:其他好文   时间:2014-05-30 23:26:36    阅读次数:204
Best Time to Buy and Sell Stock
Say you have an array for which theithelement is the price of a given stock on dayi.If you were only permitted to complete at most one transaction (ie...
分类:其他好文   时间:2014-05-30 16:30:00    阅读次数:282
Valid Palindrome
Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.For example,"A man, a plan, a canal: Pana...
分类:其他好文   时间:2014-05-30 16:24:31    阅读次数:222
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