CF1185F Two Pizzas 洛谷评测传送门 题目描述 A company of nn friends wants to order exactly two pizzas. It is known that in total there are 99 pizza ingredients in nature, which are denoted by integers from 11 to 99 . Each of the nn friends has one or more favori…

你发现 pizza 种类数不会很多,状压一下就可以了 code: #include <bits/stdc++.h> #define M 11 #define N 100005 #define LL long long using namespace std; int n,m,cnt; int v[1<<M],tmp[M],id[1<<M],a1[1<<M],a2[1<<M]; LL val[1<<M]; LL mer[1<<…

转自:https://my.oschina.net/liuyuantao/blog/751337 简介 使用内部的class Meta 定义模型的元数据,例如: from django.db import models class Ox(models.Model): horn_length = models.IntegerField() class Meta: ordering = ["horn_length"] verbose_name_plural = "oxen&quo…

原文地址:http://hannesdorfmann.com/annotation-processing/annotationprocessing101 In this blog entry I would like to explain how to write an annotation processor. So here is my tutorial. First, I am going to explain to you what annotation processing is, w…

可用的 Meta 选项 abstract Options.abstract 如果 abstract = True ,这个 model 就是一个 抽象基类 . app_label Options.app_label 如果一个 model 定义在默认的 models.py 之外 (例如,如果你的 app 的 models 在 myapp.models 子模块下),你必须定义 app_label 让 Django 知道它属于哪一个 app app_label = 'myapp' db_table Op…

What Is Mathematics? The National Council of Teachers of Mathematics (NCTM), the world's largest organization devoted to improving mathematics education, is developing a set of mathematics concepts, or standards, that are important for teaching and l…

Hie with the Pie Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 3160   Accepted: 1613 Description The Pizazz Pizzeria prides itself in delivering pizzas to its customers as fast as possible. Unfortunately, due to cutbacks, they can affo…

D - Hie with the Pie Crawling in process... Crawling failed Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%lld & %llu Submit Status Description   Input   Output   Sample Input   Sample Output   Hint   Description The Pizazz Pizzeria…

Django对数据库的操作分用到三个类:Manager.QuerySet.Model. Manager的主要功能定义表级方法(表级方法就是影响一条或多条记录的方法),我们可以以models.Manager为父类,定义自己的manager,增加表级方法: QuerySet是Manager的方法返回的,是一个可遍历结构,包含一个或多个元素,每个元素都是一个Model 实例,它里面的方法也是表级方法. Model是一条记录的类,它的功能很强大,里面包含外键实体等,它的方法都是记录级方法(都是实例方法,…

From Head First Design Patterns. Design Principle: Idnetify the aspects of your application that vary and separate them from what stays the same. Here's another way to think about it: Take the parts that vary and encapsulate them, so that later you c…