题目链接

题意:输入一个文本,找出所有不同的单词(连续的字母序列),按字典序从小到大输出。单词不区分大小写。

刘汝佳算法竞赛入门经典(第二版)P112

#include <iostream>
#include <string>
#include <set>
#include <sstream>
using namespace std;
set<string> dict;//string集合
int main()
{
string s,buf;
while(cin>>s)
{
for(int i=; i<s.length(); i++)
if(isalpha(s[i])) s[i]=tolower(s[i]);
else s[i]=' ';
stringstream ss(s);
while(ss>>buf) dict.insert(buf);
}
for(set<string>::iterator it= dict.begin();it!=dict.end();it++)
cout<<*it<<endl;
return ;
}

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