C++ set 使用范例

#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;
}