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Are you ready for Valentine's Day, my fellow stargazers? Not sure if you know this, but the astrology weather will be extra charming this year, so it should be a groovy time. However, I'm going to share the advice you should follow for Valentine's Da…
vijosP1413 Valentine’s Present 链接:https://vijos.org/p/1413 [思路] 组合公式. 由题目知:每个箱子中的蛋糕要么与箱子颜色相同,要么指向一个蛋糕与箱子颜色相同的箱子.先从n个箱子中选取i个作为指向自己(箱子蛋糕颜色相同)的箱子,数目为C(n,i),剩下的n-i个箱子每个箱子有i个选择所以方案数为i^(n-i),总的方案数为C(n,i)*i^(n-i),枚举i计和即可. [代码] #include<iostream> using name…
FFF at Valentine Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 1060    Accepted Submission(s): 506 Problem Description At Valentine's eve, Shylock and Lucar were enjoying their time as any oth…
题目链接 Problem Description At Valentine's eve, Shylock and Lucar were enjoying their time as any other couples. Suddenly, LSH, Boss of FFF Group caught both of them, and locked them into two separate cells of the jail randomly. But as the saying goes:…
FFF at Valentine Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 730    Accepted Submission(s): 359 Problem Description At Valentine's eve, Shylock and Lucar were enjoying their time as any othe…
FFF at Valentine Time Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 575    Accepted Submission(s): 281 Problem Description At Valentine's eve, Shylock and Lucar were enjoying their time as any oth…
传送门 The Experience of Love Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 221    Accepted Submission(s): 91 Problem Description A girl named Gorwin and a boy named Vivin is a couple. They arriv…
At Valentine's eve, Shylock and Lucar were enjoying their time as any other couples. Suddenly, LSH, Boss of FFF Group caught both of them, and locked them into two separate cells of the jail randomly. But as the saying goes: There is always a way out…
2019 杭电多校 10 1003 题目链接:HDU 6693 比赛链接:2019 Multi-University Training Contest 10 Problem Description Oipotato loves his girlfriend very much. Since Valentine's Day is coming, he decides to buy some presents for her. There are \(n\) presents in the shop…
Valentine's Day Time Limit: 2000/2000 MS (Java/Others)    Memory Limit: 524288/524288 K (Java/Others)Total Submission(s): 0    Accepted Submission(s): 0Special Judge Problem Description Oipotato loves his girlfriend very much. Since Valentine's Day i…
一.题目 Valentine's Day 二.分析 假设$ s_0 $代表不开心的概率,$ s_1 $代表开心一次的概率. 那么随便取一个物品,那么它的开心概率为$ p _i $,可以推导加入之后使女朋友不开心和开心一次的概率为$$ s_0 = s_0(1-p_i) $$ $$ s_1 = s_1 + (s_0 - s_1)p$$ 通过式子可以推导出,如果$  s_0 \le s_1 $,则开心一次的概率就不会有任何增长. 所以,可以将概率从大到小排序,然后不断加入,判断一下就可以了. 三.AC…
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5174 题目意思:给出 n 个人坐的缆车值,假设有 k 个缆车,缆车值 A[i] 需要满足:A[i−1]<A[i]<A[i+1](1<i<K).现在要求的是,有多少人满足,(他坐的缆车的值 + 他左边缆车的值) % INT_MAX == 他右边缆车的值. 首先好感谢出题者的样例三,否则真的会坑下不少人.即同一部缆车可以坐多个人.由于缆车的值是唯一的,所以可以通过排序先排出缆车的位置.求出…
昨晚在开赛前5分钟注册的,然后比赛刚开始就掉线我就不想说了(蹭网的下场……),只好用手机来看题和提交,代码用电脑打好再拉进手机的(是在傻傻地用手机打了一半后才想到的办法). 1001,也就是 hdu 5174,题意很难叙述了,自己看题吧,这题有数据溢出的风险,我竟然是AC了一发才发觉的(只过了小数据),幸好后来改后赶紧再交一遍才不至于被人hack,因为需要对数据去重,我不想用数组模拟,便尝试下用 map了,可是我的奇葩 map ( ~′⌒`~),连我自己都感到无语了: #include<cstd…
即兴打出这个标题,似乎性息量有点大,后面的内容真的和你想象的是一样的吗? 自上一篇blog告别这里有多少年了,掐指一算,今天是一个回归的日子,看着这里搭上云之路,渐渐的变成了云主机中的一员,感慨时事境迁,时代的标签默默地打在每一件事物的身上. 延续标题的思路,预防被称作标题党,看了一下时间,接下来就开始用最最最简短的语言分享点点从2019向前的缩影和片断,包含一些历史的解密:P 2009年9月,发表了一篇名为简单介绍SXS的一些有意思的特性的文章,似乎淡淡之笔,在文章的结尾,留下一个美好的远景.…
题目大意:给出一个有向图,问你这个图中是否对于任意两点\(u,v\),都至少满足\(u\to v\)(\(u\)可到达\(v\),下同)或\(v\to u\)中的一个. 一看就是套路的图论题,我们先把边连起来. 考虑一个很基本的性质:在一个强连通分量的点两两可达 于是肯定先Tarjan缩一波点.然后我们得到了一个DAG 接下来就是考虑是否有两个点(当然是缩点之后的了)互不可达. 这个可以直接跑一边拓扑排序.然后看一下是否在某个时刻有两个点的入度为零即可. CODE #include<cstdio…
To be really happy and really safe, one ought to have at least two or three hobbies, and they must all be real. It is no use starting late in life to say: "I will take an interest in this or that." Such an attempt only aggravates the strain of m…
[链接]http://acm.hdu.edu.cn/showproblem.php?pid=6165 [题意] 一张有向图,n个点,m条边,保证没有重边和自环.询问任意两个点能否满足任何一方能够到达另外一方. [题解] 用Tarjan算法,先把有向图的强连通分量缩成一个点,缩完点之后,剩下的就是一张有向无环图了. 对其进行拓扑排序.一定要唯一的拓扑排序才能够满足题目的要求. 也即,为一条链的时候. 一旦某个时刻做拓扑排序的队列大小大于1就输出无解 [错的次数] 0 [反思] 在这了写反思 [代码…
题意:给定n件物品,每件物品让周驿东开心的概率为a[i] 要求从中选一些,使得周驿东恰好开心一次的概率最大 n<=1e4,0<=a[i]<=1 思路: #include<bits/stdc++.h> using namespace std; typedef long long ll; typedef unsigned int uint; typedef unsigned long long ull; typedef pair<int,int> PII; typed…
题意: 有许多物品,每个物品有一定概率让女朋友开心.你想让女朋友开心且只开心一次,让你挑一些物品,使得这个只开心一次的概率最大,求最大概率. 题解: 设物品i让女朋友开心的概率为$p_i$ 若你挑选了1-k共k个物品,则可记女朋友一次都开心不了的概率$w_0=\prod _{i=1}^k (1-p_i)$ 女朋友恰好开心一次的概率$w_1=C_k^1\sum _{i=1}^k \frac{w*p_i}{1-p_i}$ 则若挑第k+1个物品,女朋友恰好开心一次的概率为$w^,=w_0*p_k+w_…
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=6165 题意:给你一个无环,无重边的有向图,问你任意两点,是否存在路径使得其中一点能到达另一点 解析:强联通后拓扑排序,因为对于每一层来说只能有一个入度为零的点,若存在两个,那么就会存在一对点不可达 #include<iostream> #include<cstdio> #include<cstring> #include<string> #include<…
今天遇到一个问题是往 SQL Server 中导入像m².m³这样的单位数据,可是在 SQL Server 中查看到的都是 m2.m3,于是在网上查了一下资料,顺便摘录下来供日后查阅. 一  Windows 系统下快速键入一些特殊字符 ALT+小键盘0153        ™ ALT+小键盘0169        © ALT+小键盘0174        ® ALT+小键盘0177        ± ALT+小键盘0178        ² ALT+小键盘0179        ³ ALT+小键…
Tree Recovery Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 11939   Accepted: 7493 Description Little Valentine liked playing with binary trees very much. Her favorite game was constructing randomly looking binary trees with capital le…
随便在一个盘下 新建register.py的文件,内容如下: #   # script to register Python 2.0 or later for use with win32all   # and other extensions that require Python registry settings   #   # written by Joakim Loew for Secret Labs AB / PythonWare   #   # source:   # http:/…
Description "寄没有地址的信,这样的情绪有种距离,你放着谁的歌曲,是怎样的心心静,能不能说给我听."失忆的Eden总想努力地回忆起过去,然而总是只能清晰地记得那种思念的感觉,却不能回忆起她的音容笑貌. 记忆中,她总是喜欢给Eden出谜题:在 valentine's day 的夜晚,两人在闹市中闲逛时,望着礼品店里精巧玲珑的各式玩偶,她突发奇想,问了 Eden这样的一个问题:有n个玩偶,每个玩偶有对应的价值.价钱,每个玩偶都可以被买有限次,在携带的价钱m固定的情况下,如何选择…
Name Character Unicode code point (decimal) Standard Description quot " U+0022 (34) XML 1.0 double quotation mark amp & U+0026 (38) XML 1.0 ampersand apos ' U+0027 (39) XML 1.0 apostrophe (apostrophe-quote) lt < U+003C (60) XML 1.0 less-than s…
[BZOJ 1176:单点修改,查询子矩阵和]: 1176: [Balkan2007]Mokia Time Limit: 30 Sec  Memory Limit: 162 MBSubmit: 2005  Solved: 894[Submit][Status][Discuss] Description 维护一个W*W的矩阵,初始值均为S.每次操作可以增加某格子的权值,或询问某子矩阵的总权值.修改操作数M<=160000,询问数Q<=10000,W<=2000000. Input 第一行两…
Description "寄没有地址的信,这样的情绪有种距离,你放着谁的歌曲,是怎样的心心静,能不能说给我听."失忆的Eden总想努力地回忆起过去,然而总是只能清晰地记得那种思念的感觉,却不能回忆起她的音容笑貌. 记忆中,她总是喜欢给Eden出谜题:在 valentine's day 的夜晚,两人在闹市中闲逛时,望着礼品店里精巧玲珑的各式玩偶,她突发奇想,问了 Eden这样的一个问题:有n个玩偶,每个玩偶有对应的价值.价钱,每个玩偶都可以被买有限次,在携带的价钱m固定的情况下,如何选择…
Windows系统,python环境搭建. 下载并安装python2.7.11 https://www.python.org/downloads/ 下载并安装python的mysql包: http://www.codegood.com/downloads http://sourceforge.net/projects/mysql-python/?source=typ_redirect 注意: 如果你使用的是python的64为版本,需要下载对应的64为版本的mysql包.  MySQL-pyth…
http://blog.csdn.net/ldghd/article/details/9632455 *****************************      一      ************************** AssetBundle incompatibility 1   I just started receiving the following error: The asset bundle 'http://***.unity3d' couldn't be lo…
情人节伴随着元宵节刚刚过去,Power BI团队就送给我们一份大礼,利用来自NRF(national retail foundation)和Bing搜索的数据,在Power BI中帮助我们发现在美国那边,关于情人节的数据. 首先从购买关系上来看这部分数据,总体来看,毫无疑问地配偶间赠送的占比最多,平均达到78.1刀,并且总体来看保持着三年的增长,从2012年开始增长达百分之5.4.其次是家庭成员间赠送和朋友间赠送,分别是23.4刀和7.1刀.而从地域分布的角度来看,南方人似乎更浪漫那么一点点,平…