题意：有n个人买东西，第i个人买东西的概率为Pi。已知最终有r个人买了东西，求每个人买东西的概率。分析：设事件E为r个人买了东西，事件Ei为第i个人买了东西。所求为P(Ei|E) = P(EiE) / P(E)用一个buy数组记录每个人买或没买东西，然后dfs。枚举所有r个人买了东西的情况的概率pr...
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其他好文 时间：
2014-12-21 10:18:55
阅读次数：
175
Say you have an array for which the ith element is the price of a given stock on day i.
Design an algorithm to find the maximum profit. You may complete at most two transactions.
Note:
You may ...
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其他好文 时间：
2014-12-20 18:20:25
阅读次数：
128
今天简单的实现了一下ecshop商品导出到第三方的购买链接功能。大致思路是给商品添加一个buy_link的text字段，存为json结构，然后通过json解析输出到商品购买页面1.添加字段增加购买链接字段，执行sql语句：1ALTERTABLE`ecs_goods`ADD`buy_link` TEX...
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其他好文 时间：
2014-12-18 00:08:04
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304
1 #include 2 3 new g_bInBuyZone[33] 4 new g_bInBombZone[33] 5 6 public plugin_init() 7 { 8 register_plugin("buy and bomb zone", "1.0", "crsky"...
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其他好文 时间：
2014-12-17 01:30:32
阅读次数：
155
Because of the 90th anniversary of the Coherent & Cute Patchouli (C.C.P), Kawashiro Nitori decides to buy a lot of rare things to celebrate.
Kawashiro Nitori is a very shy kappa (a type of wate...
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编程语言 时间：
2014-12-15 23:38:12
阅读次数：
285
Say you have an array for which theithelement is the price of a given stock on dayi.If you were only permitted to complete at most one transaction (ie...
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其他好文 时间：
2014-12-11 23:39:11
阅读次数：
212
Say you have an array for which theithelement is the price of a given stock on dayi.Design an algorithm to find the maximum profit. You may complete a...
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其他好文 时间：
2014-12-11 00:16:55
阅读次数：
139
Problem Description
When the winter holiday comes, a lot of people will have a trip. Generally, there are a lot of souvenirs to sell, and sometimes the travelers will buy some ones with pleasure. N...
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其他好文 时间：
2014-12-10 18:12:15
阅读次数：
167
Description
Lindsay is a shopaholic. Whenever there is a discount of the kind where you can buy three items and only pay for two, she goes completely mad and feels a need to buy all items in the st...
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其他好文 时间：
2014-12-09 21:31:27
阅读次数：
166
Say you have an array for which the ith element is the price of a given stock on day i.
If you were only permitted to complete at most one transaction (ie, buy one and sell one share of the stock),...
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其他好文 时间：
2014-12-09 17:56:20
阅读次数：
171
