Set操作UVa 10815Andy's First Dictionary

Set操作以及stringstream
汝佳p112
输入一个文本，找出所有不同的单词(连续的字母序列)，按字母序从小到大输出，单词不区分大小写。
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 out
a
adventures
blondes
came
disneyland
fork
going
home
in
left
read
road
sign
so
the
they
to
two
went
were
when

#include <iostream>#include<set>#include<sstream>#include<cctype>using namespace std;int main(int argc, char *argv[]){    string s,word;    set<string> a;    typedef set<string> Set;    while(cin>>s)    {        for(int i=0;i<s.size();i++)            if(isalpha(s[i]))   s[i]=tolower(s[i]);            else s[i]=' ';        stringstream ss(s);        while(ss>>word)            a.insert(word);         }    for(Set::iterator it=a.begin();it!=a.end();it++)                cout<<*it<<endl;    return 0;}