#include <iostream>
#include <string>
#include <sstream>
#include <vector>
using namespace std;

int main() {
    //用于存放分割后的字符串
    vector<string> res;
    //待分割的字符串，含有很多空格
    string word = "   Hello, I want   to learn C++!   ";
    //暂存从word中读取的字符串
    string result;
    //将字符串读到input中
    stringstream input(word);
    //依次输出到result中，并存入res中
    while (input >> result)
        res.push_back(result);
    //输出res
    for (int i = 0; i < res.size(); i++) {
        cout << res[i] << endl;
    }
    return 0;
}