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题目链接:F - Sorting Color Balls (atcoder.jp) 题意: 有n个球,球有颜色和数字.对相邻的两球进行交换时,若颜色不同,需要花费1的代价.求将球排成数字不降的顺序,所需的最小代价. 思路: 将完成排序所需的最小代价记作 cost,将颜色不同的逆序对( i < j && xi > xj && ci ≠ cj )数量记作 cnt ,则有 cost = cnt.证明如下: 可以构造出一种所需花费为 cnt 的排序方案:将这n个球按颜色…
Android Animation学习(三) ApiDemos解析:XML动画文件的使用 可以用XML文件来定义Animation. 文件必须有一个唯一的根节点: <set>, <objectAnimator>, or <valueAnimator>三者之一. 对应的Java类是: ValueAnimator - <animator> ObjectAnimator - <objectAnimator> AnimatorSet - <set&…
Problem Description background: Philip likes to play the QQ game of Snooker when he wants a relax, though he was just a little vegetable-bird. Maybe you hadn't played that game yet, no matter, I'll introduce the rule for you first. There are 21 objec…
<!doctype html> <html> <head> <meta charset="UTF-8"> <title>canvasTest</title> </head> <body> <input type="button" id="clbtn" value="清除画布" style="border:1px so…
background: Philip likes to play the QQ game of Snooker when he wants a relax, though he was just a little vegetable-bird. Maybe you hadn't played that game yet, no matter, I'll introduce the rule for you first. There are 21 object balls on board, in…
一. 一.作业需求: 1.完成商城列表静态页面的抒写 二.博客地址:https://www.cnblogs.com/catepython/p/9205636.html 三.运行环境 操作系统:Win10 Python:3.6.4rcl Pycharm:2017.3.4 四.功能实现 1)按照样式抒写了HTML商城列表页面 五.备注 readme 二.程序结构图 三.核心代码 <!DOCTYPE html> <html lang="en"> <head>…
Python-100Day-学习打卡Author: Seven_0507Date: 2019-05-22123 文章目录Python图形用户界面和游戏开发1. tkinter模块2. Pygame进行游戏开发Python图形用户界面和游戏开发1. tkinter模块"""使用tkinter创建GUI- 顶层窗口- 控件- 布局- 事件回调"""import tkinterimport tkinter.messagebox def main():…
游戏来源于 Mdn学习网站: 该例子用于对象的理解非常有效(建议看完上面网站的内容在开始练习) 弹球 body { margin: 0; overflow: hidden; font-family: "PingFangSC-Regular", "微软雅黑", sans-serif; height: 100%; } h1 { font-size: 2rem; letter-spacing: \-1px; position: absolute; margin: 0; t…
from enum import Enum, uniquefrom math import sqrtfrom random import randint import pygame @uniqueclass Color(Enum): """颜色""" RED = (255, 0, 0) GREEN = (0, 255, 0) BLUE = (0, 0, 255) BLACK = (0, 0, 0) WHITE = (255, 255, 255)…
这十题感觉是100题内相对较为麻烦的,有点搞我心态... HDU2060 Snooker 题目链接 Problem Description background: Philip likes to play the QQ game of Snooker when he wants a relax, though he was just a little vegetable-bird. Maybe you hadn't played that game yet, no matter, I'll in…