http://www.fishyou.com/filtration-biological.php Biological Filtration Biological filtration is the removal of harmful waste chemicals that is produced by fish waste and uneaten food in the aquarium. These waste products causes the rise of ammonia in…

http://www.fishyou.com/aquarium-filtration.php Aquarium Filtration This section covers aquarium filtration. This is the most important aspect of fishkeeping. In fact, to your fish, this is as important as the sewage system you have! Without it you ca…

http://www.fishyou.com/aquarium-cycling.php Aquarium Cycling Aquarium cycling actually refers to the nitrogen cycle. It is a process where waste products from your fish converts from harmful chemicals to harmless chemicals, naturally! Getting Started…

传送门:hdu 5894 hannnnah_j’s Biological Test 题目大意:n个座位,m个学生,使每个学生的间隔至少为k个座位 组合中的插空法 思路:每个学生先去掉k个空位间隔,剩下n-k*m:这些空位至少要坐m个学生,n-k*m-1个空,插m-1个门,方法数为:c(n-k*m-1,m-1):当只有一个学生时,间隔K个位的条件就没必要了,也就是n>k+1的条件不一定要成立 顺带弄了个Lucas的模板 /**************************************…

题目链接:hdu_5894_hannnnah_j’s Biological Test 题意: 有n个不同的位置围成一个圈,现在要安排m个人坐,每个人至少的间隔为k,问有多少种安排 题解: 先打表找规律,最后发现答案为n*C(n-m*k-1,n-m*k-m)/m 然后这里求组合要预处理一下,逆元也预处理一下 最后还要特判m为1的情况 #include<cstdio> typedef long long ll; ; ; ,},a[maxn],b[maxn]; ll pow_mod(ll a, ll…

无生物学重复RNA-seq分析 CORNAS: coverage-dependent RNA-Seq analysis of gene expression data without biological replicates BMC Bioinformatics 的一篇文章中提出了一种新的差异基因分析方法. 这篇文章提出了CORNAS(COverage-dependent RNA-Seq) 方法,利用贝叶斯方法来推断真实基因表达数的  后验分布. 其创新型之一该方法包括了由RNA样品浓度决定的…

'''this application aimed to cauculate people's biological block about emotional(28), energy(23),intelligence(33) based on their birth date and the date you wanna analyse, current date will be used without another data applied''' import datetimeimpor…

'''this application aimed to cauculate people's biological block about emotional(28), energy(23),intelligence(33) based on their birth date and the date you wanna analyse, current date will be used without another data applied''' import datetimeimpor…

Computational biological hypothesis generation using "-omics" data Forming biological hypotheses are crucial to the success of scientific investigations in modern biology and medicine. To generate good biological hypotheses efficiently, computat…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5894 题意: 一个圆桌上有$n$个不同的位置,$m$个相同的人安排到这$n$个位置上,要求两人相邻的人至少相距$k$个位置,问有多少种安排方法? 分析: 我们可以将$1个人的位置和他旁边的k个位置绑定$看成一个盒子,剩下的$n-mtimes (k+1)$个空位置看成若干相同的球,那么这些空位置的插入问题就可以转化为将 $a个相同的球放入b个不同的盒子中$,此时$a=n - m times (k+1…