Andy's First Dictionary UVA

https://vjudge.net/problem/UVA-10815

#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 = 0; 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 << "\n";

    return 0;
}

set中元素已从小到大进行排序了

set<string>::iterator it是迭代器，用法与指针类似