G. Sequence Number In Linear algebra, we have learned the definition of inversion number: Assuming A is a ordered set with n numbers ( n > 1 ) which are different from each other. If exist positive integers i , j, ( 1 ≤ i < j ≤ n and A[i] > A[j])…

题目链接:http://acm.hzau.edu.cn/problem.php?id=1205 [题意]给你一串数,要求你找到两个数a[i],a[j],使得a[i]<=a[j]且j>=i且j-i最大. [分析]预处理1~i的最小值,然后从右往左双指针,维护右端点>左端点,如果右端点<1~L的最小值,则移动右端点. #include <cstdio> #include <vector> #include <cstring> #include <…

mysql oom之后,重启时发生130517 16:00:10 InnoDB: Error: page 447 log sequence number 292344272InnoDB: is in the future! Current system log sequence number 1595916.InnoDB: Your database may be corrupt or you may have copied the InnoDBInnoDB: tablespace but no…

预备 首先提及一个概念叫重放攻击,对应的机制叫做:anti-replay https://en.wikipedia.org/wiki/Anti-replay IPsec协议的anti-replay特性就是用来应对重放攻击的一种机制,方法是: 增加两个机制:序列号(seqence number)和收包窗口(sliding window) 发包方从0开始计数,每发一个包就把序号加1. 收包方拥有一个长度为N的滑动窗口,序号在窗口外的包都认为是无效包. 序号在窗口内的重复包,也被认为是无效包.窗口下边…

1570: Sequence Number 时间限制: 1 Sec  内存限制: 1280 MB 题目描述 In Linear algebra, we have learned the definition of inversion number: Assuming A is a ordered set with n numbers ( n > 1 ) which are different from each other. If exist positive integers i , j, (…

原文见:http://packetlife.net/blog/2010/jun/7/understanding-tcp-sequence-acknowledgment-numbers/ from:https://blog.csdn.net/a19881029/article/details/38091243 如果你正在读这篇文章,很可能你对TCP“非著名”的“三次握手”或者说“SYN,SYN/ACK,ACK”已经很熟悉了.不幸的是,对很多人来说,对TCP的学习就仅限于此了.尽管年代久远,TCP仍…

InnoDB: The log sequence number in ibdata files does not matchInnoDB的:在ibdata文件的日志序列号不匹配 可能ibdata文件损坏了解决办法如下:在my.cny 的[mysqld]中加入 # Size of each log file in a log group. You should set the combined size      # of log files to about 25%-100% of your b…

有时候,你会在ORACLE数据库的告警日志中发现"Thread <number> cannot allocate new log, sequence <number>  Checkpoint not complete"这类告警.具体案例如下所示: Thread 1 cannot allocate new log, sequence 279334 Checkpoint not complete Current log# 4 seq# 279333 mem# 0:…

当插入值需要从另外一张表中检索得到的时候,如下语法的sql语句已经不能完成该功能:insert into my_table(id, name) values ((select seq_my_table.nextval from dual), ‘runto30′); 会报“ORA-02287: sequence number not allowed here”的错误,可以使用如下语句来完成: insert into my_table(id, name) select seq_my_table.ne…

点击阅读原译文 原文见:http://packetlife.net/blog/2010/jun/7/understanding-tcp-sequence-acknowledgment-numbers/ 如果你正在读这篇文章,很可能你对TCP"非著名"的"三次握手"或者说"SYN,SYN/ACK,ACK"已经很熟悉了.不幸的是,对很多人来说,对TCP的学习就仅限于此了.尽管年代久远,TCP仍是一个相当复杂并且值得研究的协议.这篇文章的目的是让你能够…

B. Lipshitz Sequence Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/601/problem/B Description A function  is called Lipschitz continuous if there is a real constant K such that the inequality |f(x) - f(y)| ≤ K·|x - y| hold…

题目如下: Given a sequence of positive integers and another positive integer p. The sequence is said to be a "perfect sequence" if M <= m * p where M and m are the maximum and minimum numbers in the sequence, respectively. Now given a sequence an…

Problem Description OO has got a array A of size n ,defined a function f(l,r) represent the number of i (l<=i<=r) , that there's no j(l<=j<=r,j<>i) satisfy ai mod aj=0,now OO want to know ∑i=1n∑j=inf(i,j) mod (109+7).   Input There are m…

题目链接 Problem Description Alice are given an array A[1..N] with N numbers. Now Alice want to build an array B by a parameter K as following rules: Initially, the array B is empty. Consider each interval in array A. If the length of this interval is le…

B. New Year and Ascent Sequence 题意:定义上升序列Ascent,在一组序列A中,存在1<i<j<n,使得Ai<Aj.现在给定n个序列,求n个序列两两组合的n^2个组合序列中,有多少个组合是Ascent序列.. 思路: 用两个MAX,MIN数组分别记录下每个序列的最大值和最小值,然后把最大值进行排序.每次做一遍二分,取每个数组中的最小值到所有数组中的最大值中找有多少个数比它大,这样组合的新序列便是满足Ascent性质.如果本身这个序列就已经满足Asce…

1133 刚开始还用记忆化推了下公式 后来发现数是非常大的 二分 然后就是精度错误 中间值会很大 乱七八糟的改 #include <iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<stdlib.h> #include<cmath> #include<vector> using namespace std; #define L…

题意:对于一个数\(x\),有函数\(f(x)\),如果它是偶数,则\(x/=2\),否则\(x-=1\),不断重复这个过程,直到\(x-1\),我们记\(x\)到\(1\)的这个过程为\(path(x)\),它表示这个过程中所有\(x\)的值,现在给你一个数\(n\)和\(k\),要你找出最大的数\(x\),并且\(x\)在\(path[1,n]\)中出现的次数不小于\(k\). 题解:我们对于\(x\)可以选择分奇偶来讨论. 1.假如\(x\)为奇数,那么根据题意,我们知道\(x,2x,2x…

原因: 使用了多线程,多线程共享了同一个数据库连接,但每个execute前没有加上互斥锁 方法: 方法一:每个execute前加上互斥锁 lock.acquire()         cursor.execute(command,data)              lock.release() 方法二: 每个线程拥有自己的数据库连接,即在线程调用函数中加上数据库连接代码 方法三: 所有线程共用一个连接池,需要考虑线程总数和连接池连接数上限的问题…

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AX2012的number sequence framework中引入了两个Scope和segment两个概念,它们的具体作用从下面序列的例子说起. 法国/中国的法律要求财务凭证的Journal number包含公司代码和财务期间,比如这样的号码J-20-Jan11-000340,J表上Journal,20代表的是公司代码,Jan11为财务期间,000340才是系统生成的流水号. 在创建Numer sequence的界面上可以选择需要的Scope: Company and fiscal cale…

SQL> create sequence seq1 minvalue 1 maxvalue 999999999999999999999999999 start with 0 increment by 1 cache 20;  2    3    4    5    6  create sequence seq1 * ERROR at line 1: ORA-04006: START WITH cannot be less than MINVALUE 提示 起始值不能小于最小值 SQL> cre…

  在ORACLE数据库中,序列(SEQUENCE)是使用非常频繁的一个数据库对象,但是有时候会遇到序列(SEQUECNE)跳号(skip sequence numbers)的情形,那么在哪些情形下会遇到跳号呢? 事务回滚引起的跳号 不管序列有没有CACHE.事务回滚这种情况下,都会引起序列的跳号.如下实验所示: SQL> create sequence my_sequence   2  start with 1   3  increment by 1   4  maxvalue 99999  …

Oracle Metric sequence load elapsed time The sequence load elapsed time Oracle metric is the amount of elapsed time spent getting the next sequence number from the data dictionary. If a sequence is cached, then this is the amount of time spent replen…

昨天一台SQL Server 2008R2的数据库在凌晨5点多抛出下面告警信息: The log scan number (620023:3702:1) passed to log scan in database 'xxxx' is not valid. This error may indicate data corruption or that the log file (.ldf) does not match the data file (.mdf). If this error oc…

1.查看OGG线程状态 GGSCI (klcoredb-node1) 46> info all Program Status Group Lag at Chkpt Time Since Chkpt MANAGER RUNNING EXTRACT RUNNING EXTBI unknown 00:00:04 EXTRACT RUNNING PXTBI 00:00:00 00:00:02 REPLICAT RUNNING REP_1B 14:32:46 00:00:02 REPLICAT RUNNI…

转自 http://blog.csdn.net/tianlesoftware/article/details/5995051 之前整理的一篇文章: ORACLE SEQUENCE 介绍 http://blog.csdn.net/tianlesoftware/archive/2009/10/30/4745039.aspx 之前整理的一篇文章. 那是还是写blog初期的作品. 2009年10月份的. 转眼一年,写Blog 也比以前成熟了很多. 一. 理论知识 先看一个创建Sequence的语句: S…

create sequence seq_test start with 3 increment by 1 minvalue 1  --范围-(1027 -1) maxvalue 999999999999999999999999999 ; --范围1028-1 先 seq_test.nextval ,后 seq_test.currval select seq_test.nextval from dual; select seq_test.currval from dual; create sequ…

 ORACLE  SEQUENCE     ORACLE没有自增数据类型,如需生成业务无关的主键列或惟一约束列,能够用sequence序列实现. CREATE SEQUENCE语句及參数介绍: 创建序列:须要有CREATE SEQUENCE或者CREATE ANY SEQUENCE权限,  CREATE SEQUENCE [ schema. ]sequence     [ { INCREMENT BY | START WITH } integer     | { MAXVALUE integer…

本文为摘抄,目的为方便日后阅读: http://docs.oracle.com/cd/B12037_01/server.101/b10734/rcmbackp.htm To determine the archived logs needed for recovery of an online backup: Start SQL*Plus and archive all unarchived logs, including the current log:SQL> ALTER SYSTEM AR…

def search(sequence, number, lower=0, upper=None): if upper is None: upper = len(sequence) - 1 if lower == upper: assert number == sequence[upper] return upper else: middle = (lower + upper) // 2 if number > sequence[middle]: return search(sequence,…