L1-027 出租 (20 分)

该博客主要解析了一道PAT编程题,题目要求根据11位手机号码生成特定格式的代码,代码中数字按递减顺序排列。博客提供了输入格式、输出格式以及一个输入样例和相应的输出样例。

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作者: 陈越

单位: 浙江大学

时间限制: 400 ms

内存限制: 64 MB

代码长度限制: 16 KB

下面是新浪微博上曾经很火的一张图:

一时间网上一片求救声,急问这个怎么破。其实这段代码很简单,index数组就是arr数组的下标,index[0]=2 对应 arr[2]=1index[1]=0 对应 arr[0]=8index[2]=3 对应 arr[3]=0,以此类推…… 很容易得到电话号码是18013820100

本题要求你编写一个程序,为任何一个电话号码生成这段代码 —— 事实上,只要生成最前面两行就可以了,后面内容是不变的。

输入格式:

输入在一行中给出一个由11位数字组成的手机号码。

输出格式:

为输入的号码生成代码的前两行,其中arr中的数字必须按递减顺序给出。

输入样例:

18013820100

输出样例:

int[] arr = new int[]{8,3,2,1,0};
int[] index = new int[]{3,0,4,3,1,0,2,4,3,4,4};

源码:

### L1-027 出租 Problem Set Usage or Solution in Programming Context In the context of solving problems like L1-027 出租, using sets efficiently is crucial for managing unique elements and performing operations such as membership testing, union, intersection, difference, and symmetric difference. Sets are particularly useful when dealing with collections where each element should appear only once. For instance, consider a scenario where one needs to track different types of items being rented out without any duplicates. A Python `set` can be used effectively here: ```python rented_items = {"laptop", "projector", "microphone"} new_rental_request = ["speaker", "laptop"] # Adding new rental requests while avoiding duplicates for item in new_rental_request: rented_items.add(item) print(rented_items) # Output will include all unique items requested. ``` When it comes to more complex scenarios involving multiple datasets, set operations become even more powerful. For example, finding common rentals between two customers could involve an intersection operation: ```python customer_a_rentals = {"camera", "tripod", "lighting kit"} customer_b_rentals = {"sound mixer", "camera"} common_rentals = customer_a_rentals.intersection(customer_b_rentals) print(common_rentals) # This would output {'camera'} indicating shared rentals. ``` Regarding specific solutions tailored towards L1-027 出租 problem, understanding how sets interact within algorithms designed around this challenge becomes essential. The use of sets helps streamline data handling by ensuring that every piece of equipment listed under rent appears just once unless explicitly required otherwise through additional logic implemented outside simple set functionality[^1].
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