Say you have an array for which the ith element is the price of a given stock on day i.

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.

Say you have an array for which the _i_th element is the price of a given stock on day i.

工厂方法模式（Factory Method），是23种设计模式之一。DP中是这么定义工厂方法模式的：

本成果以“Sensitivity of high-temperature weather to initial soil moisture: a case study using the WRF model”为题，发表在大气科学顶级期刊SCI一区期刊Atmospheric Chemistry and Physics上。......

这里需要使用差异比较用到的limma包，在使用这个包进行分析之前，需要准备三个矩阵 * 表达矩阵 * 分组矩阵 * 差异比较矩阵

若两个素数相差2则称为一对孪生素数，求区间[1,n]内的孪生素数个数。 筛法素数打表，然后判断孪生，用前缀和记录。

首先把作业按截止日期从小到大排序，如果日期相同按罚分降序，我们希望完成尽可能多的作业。然而仅靠日期排序并不是最优的，当一项作业超过截止日期时，我们不能就简单的加上罚分，我们要把它的罚分和前面完成作业的最小罚分相...

Ignatius has just come back school from the 30th ACM/ICPC. Now he has a lot of homework to do. Every teacher gives him a deadline of handing in the homework. If...

pairs John has n points on the X axis, and their coordinates are (x[i],0),(i=0,1,2,…,n−1). He wants to know how many pairs<a,b> that |x[b]−x[a]|≤k.(a<b)