10815 - Andy's First Dictionary

Andy’s First Dictionary

#include <iostream>
#include <string>
#include <set>
#include <sstream>

using namespace std;

// string集合
set<string> dict;

int main() {
string s, buf;
while(cin >> s) {
for(int i = 0; i < s.length(); i++) {
// 字母则小写，非字母则空格
if(isalpha(s[i])) {
s[i] = tolower(s[i]);
} else {
s[i] = ' ';
}
}
// stringstream以空格和回车换行作为分隔符
stringstream ss(s);
while(ss >> buf) {
dict.insert(buf);
}
}
set<string>::iterator it;
for(it = dict.begin(); it != dict.end(); ++it) {
cout << *it << endl;
}
return 0;
}