A专题-03-STL-Andy‘s First Dictionary

最新推荐文章于 2022-08-07 22:43:37 发布

第三题真的很简单qwq

最新推荐文章于 2022-08-07 22:43:37 发布

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分类专栏： A专题水题文章标签：字符串 stl

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博客详细介绍了如何通过编程帮助8岁的Andy实现他的梦想——创建自己的字典。通过从故事书中提取所有不同的单词并按字母顺序排列，文章提供了使用C++和数据结构如set和stringstream来解决这个问题的示例代码。

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Andy’s First Dictionary （UVA - 10815）

Andy, 8, has a dream - he wants to produce his very own dictionary. This is not an easy task for him, as the number of words that he knows is, well, not quite enough. Instead of thinking up all the words himself, he has a briliant idea. From his bookshelf he would pick one of his favourite story books, from which he would copy out all the distinct words. By arranging the words inalphabetical order, he is done! Of course, it is a really time-consuming job, and this is where a computer program is helpful. You are asked to write a program that lists all the different words in the input text. In this problem, a word is defined as a consecutive sequence of alphabets, in upper and/or lower case.
Words with only one letter are also to be considered. Furthermore, your program must be CaSe InSeNsItIvE. For example, words like “Apple”, “apple” or “APPLE” must be considered the same.

Input
The input file is a text with no more than 5000 lines. An input line has at most 200 characters. Input is terminated by EOF.

Output
Your output should give a list of different words that appears in the input text, one in a line. The words should all be in lower case, sorted in alphabetical order. You can be sure that he number of distinct words in the text does not exceed 5000.

Sample Input
Adventures in Disneyland
Two blondes were going to Disneyland when they came to a fork in the road. The sign read: “Disneyland Left.”
So they went home.

Sample Output
a
adventures
blondes
came
disneyland
fork
going
home
in
left
read
road
sign
so
the
they
to
two
went
were
when

题记
使用sstream从字符串中读取字符串

AC的C++代码如下：

#include<iostream>
#include<string>
#include<set>
#include<cctype>
#include<sstream>
using namespace std;

int main()
{
	string a, b;
	set<string> se;
	se.clear();
	while (cin >> a)
	{
		for (int i = 0; i < a.size(); i++)
		{
			//把字母全部转换成小写
			if (isupper(a[i])) a[i] = tolower(a[i]);
			
			//把非字母全部转换成空格，方便一会儿用cin再次读取
			if (!isalpha(a[i])) a[i] = ' ';
		}
		stringstream ss(a);
		
		//在a中从前往后以空格为分割读取字符串，即单词
		while (ss >> b) se.insert(b);                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
	}
	for (set<string>::iterator it = se.begin(); it != se.end(); it++)
		cout << *it << endl;
	return 0;
}