题意：用二分法找出数学期望。
策略，二分。
求数学期望有两种方法，一：求出每一个数的概率，再与数相乘，最后把所有的乘积相加就好了。
二：数学期望总是与平均数相等，所以可以当做求平均数。（简单方便）
代码：...
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其他好文 时间：
2014-08-25 23:00:45
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466
题目链接：http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3798
Abs Problem
Time Limit: 2 Seconds Memory Limit: 65536 KB Special Judge
Alice and Bob is playing a game, and ...
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其他好文 时间：
2014-08-25 21:16:24
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293
题目链接Tatyana is a big sports fan and she likes volleyball a lot! She writes down the final scores of the game after it has ended in her notebook.If you...
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其他好文 时间：
2014-08-25 20:42:04
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248
Abs ProblemTime Limit: 2 Seconds Memory Limit: 65536 KB Special JudgeAlice and Bob is playing a game, and this time the game is all about the absolute...
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其他好文 时间：
2014-08-25 16:56:44
阅读次数：
261
The Game of 31Time Limit: 2000/1000 MS (Java/Others)Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 592Accepted Submission(s): 273Proble...
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2014-08-25 14:37:24
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193
Little Hasan loves to play number games with his friends.One day they were playing a game where one of them will speak out a positive numberand the others have to tell the sum of its factors. The firs...
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其他好文 时间：
2014-08-25 11:57:04
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235
Abs ProblemTime Limit: 2 Seconds Memory Limit: 65536 KB Special JudgeAlice and Bob is playing a game, and this time the game is all about the absolu.....
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其他好文 时间：
2014-08-24 20:46:23
阅读次数：
203
Flip Game
Time Limit: 1000MS
Memory Limit: 65536K
Total Submissions: 30805
Accepted: 13409
Description
Flip game is played on a rectangular 4x4 field with two-sided...
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2014-08-24 18:07:32
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209
The Pilots Brothers' refrigerator
Time Limit: 1000MS
Memory Limit: 65536K
Total Submissions: 18641
Accepted: 7145
Special Judge
Description
The game “The Pilo...
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其他好文 时间：
2014-08-24 18:06:42
阅读次数：
240
EXTENDED LIGHTS OUT
Time Limit: 1000MS
Memory Limit: 10000K
Total Submissions: 6628
Accepted: 4368
Description
In an extended version of the game Lights Out, is a p...
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其他好文 时间：
2014-08-24 16:43:32
阅读次数：
198
