A. Maximum in Table time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output An n × n table a is defined as follows: The first row and the first column contain ones, that is: ai, 1 = a1, i = 1 for…

A. Maximum in Table time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output An n × n table a is defined as follows: The first row and the first column contain ones, that is: ai, 1 = a1, i = 1 for…

题目传送门 /* 模拟递推水题 */ #include <cstdio> #include <iostream> #include <cmath> #include <algorithm> #include <cstring> #include <string> #include <map> using namespace std; + ; const int INF = 0x3f3f3f3f; int a[MAXN][M…

题目链接:http://www.codeforces.com/problemset/problem/509/A题意:f[i][1]=f[1][i]=1,f[i][j]=f[i-1][j]+f[i][j-1],求f[n][n].C++代码: #include <iostream> using namespace std; ][]; int main() { cin >> n; ;i<=n;i++) f[i][] = f[][i] = ; ; i <= n; i ++) ;…

[题目链接]:http://codeforces.com/contest/509/problem/A [题意] 给你一个递推式f[i][j] = f[i-1][j]+f[i][j-1]; 让你求f[i][j]的最大值; [题解] 傻逼题 [Number Of WA] 0 [完整代码] #include <bits/stdc++.h> using namespace std; #define lson l,m,rt<<1 #define rson m+1,r,rt<<1|…

ORACLE数据库最多可以拥有多少个表空间(Tablespace)?数据库最多拥有多少个数据文件(Database files).数据库的数据文件最大可以多大?遇到这些问题只能查询官方文档,人的记忆能力是有限的.正所谓好记性不如烂笔头.下面是ORACLE 10g数据库的一些限制,以供参考. Physical Database Limits Item Type of Limit Limit Value Database Block Size Minimum 2048 bytes; must be…

详见SQL*Plus® User's Guide and Reference Release 11.2   5 Using Scripts in SQL*Plus   1.定义环境变量 _EDITOR 如: DEFINE _EDITOR = vi 然后, 编辑 EDIT SALES 在文档中写要执行的sql语句   最后 @sales执行   SQL> l   1  select   2  *   3  from   4* v$instance   最后一行带*表示当前行,选择前面的数字回车改变…

链接:Canu Parameter Reference To get the most up-to-date options, run canu -options The default values below will vary based on the input data type and genome size.(根据输入数据类型和基因组大小决定默认参数) Global Options (全局参数) The catch all category. errorRate <float=0.…

_UnsafeBitset  是一个固定大小的 bitmap,用来确定指定位置是否有元素存在. HashTable  具体的 hash 碰撞算法在HashTable里实现,目前使用的是简单的开放地址法,使用算法是Linear probing. HashTable 的属性 其实只有若干个 UInt,每一位用来表示状态,指定位置有没有被占用. @usableFromInline internal var words: UnsafeMutablePointer<Word> 算法相关 maxLoa…

A. Maximum in Table 题意:给定一个表格,它的第一行全为1,第一列全为1,另外的数满足a[i][j]=a[i-1][j]+a[i][j-1],求这个表格中的最大的数 a[n][n]即为最大的数 #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> using namespace std; int a[12][12],n; int main() {…

https://www.cmrr.umn.edu/~strupp/serial.html#CONTENTS Introduction Chapter 1, Basics of Serial Communications What Are Serial Communications? What Is RS-232? Signal Definitions Asynchronous Communications What Are Full Duplex and Half Duplex? Flow Co…

1 https://zh.wikipedia.org/wiki/HTTP/2 HTTP/2 维基百科,自由的百科全书                         HTTP/2(超文本传输协议第2版,最初命名为HTTP 2.0),是HTTP协议的的第二个主要版本,使用于万维网.HTTP/2是HTTP协议自1999年HTTP 1.1发布后的首个更新,主要基于SPDY协议.它由互联网工程任务组(IETF)的Hypertext Transfer Protocol Bis(httpbis)工作小组进行…

http://dev.mysql.com/doc/refman/5.7/en/identifiers.html The following table describes the maximum length for each type of identifier. Identifier Maximum Length (characters) Database 64 (NDB storage engine: 63) Table 64 (NDB storage engine: 63) Column…

原因:我是使用 CREATE TABLE XXX AS subquery 进行创建的数据表,主要是将相关的数据聚合在一起,然后通过导出为SQL脚本文件,进行导入到新库中,导致部分INSERT INTO语句,因数据库字符集的不一致生成的CREATE TABLE表结构的字段类型长度不一致,从而会插入失败value too large for column "SCHEMA"."TABLE"."COLUMN" (actual: 519, maximum:…

对于越来越多的数据,数据库的容量越来越大,压缩也就越来越常见了.在我的实际工作中进行过多次压缩工作,也遇到多次问题,在此和大家分享一下. 首先,我们先说说怎么使用innodb的压缩. 第一,mysql的版本需要大于5.5 第二,设置innodb_file_format=barracuda 第三,create table或者alter talble 增加 ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=8;(默认的key_block_size=16) 其实很简单,根据经验…

题目来源:https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=3&page=show_problem&problem=44  Maximum Sum  Background A problem that is simple to solve in one dimension is often much more difficult to solve in more th…

传送门 time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output Little Petya is now fond of data compression algorithms. He has already studied gz, bz, zip algorithms and many others. Inspired by the…

COMPUTER ORGANIZATION AND ARCHITECTURE DESIGNING FOR PERFORMANCE NINTH EDITION The basic mechanism for reading a word from memory involves the translation of a virtual, or logical, address, consisting of page number and offset, into a physical addres…

Table Decorations Time Limit:1000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 478C Description You have r red, g green and b blue balloons. To decorate a single table for the banquet you need exactl…

SHOW TABLE STATUS works likes SHOW TABLES, but provides a lot of information about each non-TEMPORARYtable. You can also get this list using the mysqlshow --status db_name command. The LIKE clause, if present, indicates which table names to match. Th…

在生产库MariabDB中修改字段类型,提示如下错误:​Table 'mysql.column_stats' doesn't existTable 'mysql.index_stats' doesn't exist ​MariaDB版本如下:​​MariaDB [mysql]> select @@version;+---------------------+| @@version |+---------------------+| 10.0.12-MariaDB-log |+----------…

Demo One CREATE TABLE employees_demo ( employee_id ) , first_name ) , last_name ) CONSTRAINT emp_last_name_nn_demo NOT NULL , email ) CONSTRAINT emp_email_nn_demo NOT NULL , phone_number ) , hire_date DATE DEFAULT SYSDATE CONSTRAINT emp_hire_date_nn_…

Spiral Maximum 题目连接: http://codeforces.com/problemset/problem/173/C Description Let's consider a k × k square, divided into unit squares. Please note that k ≥ 3 and is odd. We'll paint squares starting from the upper left square in the following orde…

C. Arthur and Table Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/557/problem/C Description Arthur has bought a beautiful big table into his new flat. When he came home, Arthur noticed that the new table is unstable. In t…

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace datatable { public class ConsoleTable { /// <summary> /// This will hold the header of the table. /// </summary> priv…

By starting at the top of the triangle below and moving to adjacent numbers on the row below, the maximum total from top to bottom is 23. 37 42 4 68 5 9 3 That is, 3 + 7 + 4 + 9 = 23. Find the maximum total from top to bottom in triangle.txt (right c…

Spiral Maximum Time Limit:3000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 173C Description Let's consider a k × k square, divided into unit squares. Please note that k ≥ 3 and is odd. We'll paint s…

http://mysql.taobao.org/monthly/2016/03/06/ 背景 InnoDB buffer pool中的page管理牵涉到两个链表,一个是lru链表,一个是flush 脏块链表,由于数据库的特性: 脏块的刷新,是异步操作: page存在两个版本,一个是ibd文件的持久化版本,和buffer pool内存中的当前版本. 所以在对table对象进行ddl变更的时候,要维护两个版本之间的一致性,有一些操作需要同步进行page缓存的管理.例如以下三种ddl操作: 1. fl…

C. Table Compression Little Petya is now fond of data compression algorithms. He has already studied gz, bz, zip algorithms and many others. Inspired by the new knowledge, Petya is now developing the new compression algorithm which he wants to name d…

13.1.17 CREATE TABLE Syntax 13.1.17.1 CREATE TABLE ... LIKE Syntax 13.1.17.2 CREATE TABLE ... SELECT Syntax 13.1.17.3 Using FOREIGN KEY Constraints 13.1.17.4 Silent Column Specification Changes CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name (creat…