UVA10815 太强了系列

https://blog.youkuaiyun.com/qq_40093905/article/details/79792347

#include<stdio.h>
#include<algorithm>
#include<string.h>
#include<set>
#include<sstream>
#include<iostream>
using namespace std;
 
set<string>dict;
 
int main()
{
	string s,b;
	while(cin>>s)
	{
		for(int i=0;i<s.length();i++)
	{	
			if(isalpha(s[i]))//isalpha（）判断是不是英文字符 
		{
			s[i]=tolower(s[i]);//将大写转换为小写 
		}
			else
		s[i]=' ';
	}
		stringstream ss(s);//从string对象str中读取字符，头文件#include<sstream>  
		while(ss>>b)
	 dict.insert(b);//将b输入set中 
	}
	for(set<string>::iterator p=dict.begin();p!=dict.end();p++)//迭代器，有点像指针  
        cout<<*p<<endl; 
	return 0;
 }