题目大意:维护一个数列,要求在左边插入一个数,在右边插入一个数,查询一个数的排名 题解:可以双指针,开个数组存每个数的位置 卡点:无 C++ Code: #include <cstdio> #define maxn 200010 int n, l, r = 1; int ret[maxn]; inline int min(int a, int b) {return a < b ? a : b;} int main() { scanf("%d", &n); wh…
http://codeforces.com/contest/1066/problem/C You have got a shelf and want to put some books on it. You are given qq queries of three types: L idid — put a book having index idid on the shelf to the left from the leftmost existing book; R idid — put…
题意:有一个一维的书架,\(L\)表示在最左端放一本书,\(R\)表示在最右端放一本书,\(?\)表示从左数或从右数,最少数多少次才能得到要找的书. 题解:我们开一个稍微大一点的数组,从它的中间开始模拟,\(L\)就--\(l\)放进去,\(R\)就++\(r\)放进去,然后每次更新某一本书的最新位置,因为后放的肯定离最左侧或最右侧最近,然后两端求差弄个最小值就行. 代码: int q; char c; int idx; int ans; int mp[2*N],now[2*N]; int ma…
原文 Executing Raw SQL Queries using Entity Framework While working with Entity Framework developers mostly use LINQ to Entities to query database. However, at times you may need to execute raw queries against the database. A common scenario is when yo…
在前一遍文章django models Making queries里面我们提到了django常用的一些检索数据库的内容, 下面我们来看一下更为高级的检索聚合运算 这是我们要用到的模型 class Author(models.Model): name = models.CharField(max_length=100) age = models.IntegerField() friends = models.ManyToManyField('self', blank=True) class Pu…
How to Timeout JDBC Queries JDBC queries by default do not have any timeout, which means that a query can block the thread for an unlimited amount time; of course, depending upon the DB load and the cost of the query. It is a good practice to timeout…