字符串分割单词C++

#include<iostream>
#include<bits/stdc++.h>

using namespace std;

vector<string> split(string s) {
        int len = s.length();
        int i(0);
        string ans= "", temp;
        vector<string> res;

        while(i<len) {
            temp = "";
            while(i<len&&s[i]==' ') {i++;}
            while(i<len&&s[i]!=' ') {
                temp += s[i++];
            }
            res.push_back(temp);
        }

        return res;
}


int main(int argc, char** argv) {

    string s = "dog cat cat dog";
    vector<string> res;

    res = split(s);
    cout<<"字符串单词数量   "<<res.size()<<"------"<<endl;
    for(auto i:res) {
        cout<<i<<endl;
    }
    return 0;
}