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H: Magical Balls 总Time Limit: 1000ms Memory Limit: 262144kB Link: PKU Campus 2016 H: Magical Balls Description Wenwen has a magical ball. When put on 阅读全文
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Part 4 Simulation & Base Graphics Contents 4.1 Simulation 4.1.1 Generating Random Numbers 4.1.2 Simulating a Linear Model 4.1.3 Random Sampling 4.2 Ba 阅读全文
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Part 3 Code Correctly and Efficiently Contents 3.1 Loop Functions 3.1.1 Lapply, Sapply & Vapply 3.1.2 Apply 3.1.3 Mapply 3.1.4 Tapply & Split 3.2 Debu 阅读全文
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Part 2 Programming with R Contents 2.1 Control Structures 2.2 Functions in R 2.2.1 Declarations of Functions 2.2.2 Arguments of Functions 2.3 Scoping 阅读全文
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Part 1 Nuts and Bolts Contents 1.1 Getting Started 1.1.1 R Console Input 1.1.2 Working Directory and Files 1.1.3 R Objects and Attributes 1.1.4 Sequen 阅读全文
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期末发挥实在是太差了-_-# 比2015年少了好多送分题，整体难度显得很大，但是考完之后静下来做又觉得并不是很难orz 1. 篮球联赛：暴力枚举（我用的dfs来枚举） 2. 夺宝探险：暴力dfs 3. 寻找边缘：从边缘暴力dfs 4. 猴子摘桃：可以直接用两个指针指向区间端点做到O(n) 5. 分形 阅读全文