泊松分布.... Alien's Organ Time Limit: 2 Seconds      Memory Limit: 65536 KB There's an alien whose name is Marjar. It is an universal solder came from planet Highrich a long time ago. Marjar is a strange alien. It needs to generate new organs(body parts…

Alien's Organ Time Limit: 2 Seconds      Memory Limit: 65536 KB There's an alien whose name is Marjar. It is an universal solder came from planet Highrich a long time ago. Marjar is a strange alien. It needs to generate new organs(body parts) to figh…

看了好久的题,但还是看得一脸蒙圈,感觉完全无从下手,我的队友告诉我可能是正太分布之类的,但我感觉不太像,后来才听同学说是泊松分布,才恍然大悟,概率论刚刚学过这里不久,不禁感叹,学会了还要会用啊... 泊松分布的概率函数为:(我忽然发现一件日狗的事情,那就是我发的图片被和谐掉了……): (作者正在疯狂吐血中……) 泊松分布的参数λ是单位时间(或单位面积)内随机事件的平均发生率. 泊松分布适合于描述单位时间内随机事件发生的次数,与题目描述相应和,单位时间就是天, λ 是一天内随机事件的平均发生率.求…

题目链接:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3696 Alien's Organ Time Limit: 2 Seconds      Memory Limit: 65536 KB There's an alien whose name is Marjar. It is an universal solder came from planet Highrich a long time ago. Marjar…

K - Alien's Organ Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%lld & %llu Submit Status Description There's an alien whose name is Marjar. It is an universal solder came from planet Highrich a long time ago. Marjar is a strange ali…

Alien's Organ Time Limit: 2 Seconds      Memory Limit: 65536 KB There's an alien whose name is Marjar. It is an universal solder came from planet Highrich a long time ago. Marjar is a strange alien. It needs to generate new organs(body parts) to figh…

p(k)=(y^k) / (k!) * e^(-y) 其中的y就是平均值 k就是我们要求的大小. Alien's Organ Time Limit: 2 Seconds      Memory Limit: 65536 KB There's an alien whose name is Marjar. It is an universal solder came from planet Highrich a long time ago. Marjar is a strange alien. It…

题目大意:输入一串递增的单词序列,需要找出符合条件的单词递增输出,条件是:将一个单词拆成左右两个单词后,能在输入中找到这两个单词.例如单词 alien,可以拆成 a 和 lien,而输入中刚好同时有a和lien,则符合条件,输出alien.又如单词born,无论拆成b和orn,还是bo和rn,亦或是bor和n,都无法在输入中同时找到两个被拆分的单词. 解题思路:把每一个单词拆成两个,然后就看这两个单词是否在输入单词里面.因此可以采用set集合来判断某个单词是否存在输入单词序列里面,用substr…

第十三届浙江省大学生程序设计竞赛 I 题, 一道模拟题. ZOJ  3944http://www.icpc.moe/onlinejudge/showProblem.do?problemCode=3944 In a BG (dinner gathering) for ZJU ICPC team, the coaches wanted to count the number of people present at the BG. They did that by having the waitre…

There is a new alien language which uses the latin alphabet. However, the order among letters are unknown to you. You receive a list of words from the dictionary, where words are sorted lexicographically by the rules of this new language. Derive the…