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主席树视频:https://www.bilibili.com/video/av56485341?p=2 D. Salary Changing D. Power Products https://codeforces.com/contest/1247/problem/D Constructing Ro 阅读全文
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There is a kind of balanced binary search tree named red-black tree in the data structure. It has the following 5 properties: (1) Every node is either 阅读全文
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1 all previleges语法错误 2 3 二、数据库的安全性控制 4 1、存取控制 5 ①自主存取控制(DAC)(C2级) 6 [例1] 把查询Student表权限授给用户U1 7 grant select 8 on student 9 to u1 10 [例2] 把对Student表和Co 阅读全文
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1 --外连接操作以指定表为连接主体,将主体表中不满足连接条件的元组一并输出 2 --select * from pd left/right/full join pds on pd.id = pds.dish_id 3 插入操作 4 5 1、插入元组 6 略 7 2、插入子查询结果 8 --[例4] 阅读全文
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A. 1 #include <bits/stdc++.h> 2 using namespace std; 3 const int maxn = 1e5 + 10; 4 int a[maxn], b[maxn]; 5 6 int main() 7 { 8 int t; cin >> t; 9 int 阅读全文
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1 --定义模式 2 create schema s_t authorization u1 3 --删除模式 4 drop schema s_t cascade 5 --创建数据库 6 create database s_t 7 on primary 8 ( 9 name = 'stu', 10 f 阅读全文
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The lowest common ancestor (LCA) of two nodes U and V in a tree is the deepest node that has both U and V as descendants. A binary search tree (BST) i 阅读全文
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1 --游标知识点 2 --1、在SELECT 语句中使用DISTINCT、 GROUP BY、 HAVING UNION 语句时, 游标将自动设定INSENSITIVE 选项。 3 --2、SCROLL表明所有的提取操作(如FIRST、 LAST、 PRIOR、 NEXT、 RELATIVE、 阅读全文
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1151 LCA in a Binary Tree (30 分) The lowest common ancestor (LCA) of two nodes U and V in a tree is the deepest node that has both U and V as descenda 阅读全文