The organizers of a programming contest have decided to present t-shirts to participants. There are six different t-shirts sizes in this problem: S, M, L, XL, X...

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Here are the days: Mon Tue Wed Thu Fri Sat Sun Here are the months: Jan Feb Mar Apr May Jun Jul Aug

树形DP，顾名思义是在「树」这种数据结构上进行的DP，往往给定一棵树，通过指定操作求最小代价或最大收益等。 一般方向主要分①从子节点向根节点传递信息，②根节点向子节点传递 树操作一般利用递归和搜索，如树的遍历等，用dfs...

这里生成的是一个11行3列的数据框，分别对应均值，上限和下限第一行和第二行为空值，为了提供绘图中的空行

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)

> csize <- data.frame(mean = c(NA,0.5585,0.6628,0.7794,0.7458,0.7564),lower = c(NA,0.4849,0.5867,0.5856,0.6734,0.6886),upper = c(NA,0.6319,0.7335,0.8123,0.7965,...

[<matplotlib.lines.Line2D at 0x116769150>]

[<matplotlib.lines.Line2D at 0x120ebcf90>]

上述处理的都是向量数据，而matplot()、matpoints() 和 matlines()都是处理矩阵形式数据的。