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AT2070 Card Game for Three(组合数学)
"传送门" 解题思路 前面的思路还是很好想的,就是要枚举最后一个$a$在哪出现算贡献,之后我先想的容斥,结果彻底偏了。。后来调了很久发现自己傻逼了,似乎不能容斥,终于走上正轨23333。首先可以写出一个$O(n^2)$的玩意,就是 $$ans=\sum\limits_{i=n}^{sum}C(n 1 ...
分类:其他好文   时间:2019-02-18 23:15:56    阅读次数:215
英语中的发音规则
以s结尾 The s ending is pronounced three ways, according to the ending of the verb. /iz/ after ch , sh , s , x , z endings. Example teaches, washes, kiss ...
分类:其他好文   时间:2019-02-17 10:42:46    阅读次数:234
Ball CodeForces - 12D
传送门 N ladies attend the ball in the King's palace. Every lady can be described with three values: beauty, intellect and richness. King's Master of Cer ...
分类:其他好文   时间:2019-02-17 10:35:56    阅读次数:177
LightOJ 1229 Tablecross
Treblecross is a two player game where the goal is to get three X in a row on a one-dimensional board. At the start of the game all cells in the board ...
分类:其他好文   时间:2019-02-17 10:35:40    阅读次数:182
C++学习书籍推荐《Exceptional C++(英文)》下载
百度云及其他网盘下载地址:点我 作者简介 Herb Sutter is the author of three highly acclaimed books, Exceptional C++ Style, Exceptional C++, and More Exceptional C++ (Addi ...
分类:编程语言   时间:2019-02-16 20:49:20    阅读次数:245
C++学习书籍推荐《More Exceptional C++(英文)》下载
百度云及其他网盘下载地址:点我 作者简介 Herb Sutter is the author of three highly acclaimed books, Exceptional C++ Style, Exceptional C++, and More Exceptional C++ (Addi ...
分类:编程语言   时间:2019-02-16 20:43:24    阅读次数:219
[Python3 练习] 010 找出字符串中特定的字符
One small letter, surrounded by EXACTLY three big bodyguards on each of its sides. ...
分类:编程语言   时间:2019-02-15 23:52:47    阅读次数:295
分布式计算框架
https://github.com/Roemer/NetDist A Gearman powered application consists of three parts: a client, a worker, and a job server ...
分类:其他好文   时间:2019-02-15 13:35:32    阅读次数:152
E - Intervals 贪心
Chiaki has n intervals and the i-th of them is [li, ri]. She wants to delete some intervals so that there does not exist three intervals a, b and c su ...
分类:其他好文   时间:2019-02-13 22:33:38    阅读次数:191
机器学习工程师 - Udacity 强化学习 Part Three
四、动态规划1.在动态规划设置中,智能体完全了解表示环境特性的马尔可夫决策流程 (MDP)。(这比强化学习设置简单多了,在强化学习设置中,智能体一开始不知道环境如何决定状态和奖励,必须完全通过互动学习如何选择动作。) 2.迭代方法求状态值函数迭代方法先对每个状态的值进行初始猜测。尤其是,我们先假设每 ...
分类:其他好文   时间:2019-02-13 19:31:50    阅读次数:173
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