老是超时有办法解决，或者更简单的方法

Question

输入
i have brought #peace #freedom #justice and #security to my new empire
输出
4
#freedom 1
#justice 1
#peace 1
#security 1
代码：

#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
using std::cin;
using std::cout;
using std::vector;
using std::string;
using std::find;
class Solution{
public:
    static vector<string> tags(vector<string> inputs){
        vector<string> tag;
        for(string x:inputs){
            if(x[0]=='#'&&x.size()>1&&x.find('#',1)==x.npos){
                tag.push_back(x);
            }
        }
        return tag;
    }
    static int tag_num(vector<string>tag){
        int num=0;
        int flag=0;
        for(string x:tag){
            if(count(tag.begin()+flag, tag.end(), x)<=1){
                num++;
            }
            flag++;
        }
        return num;
    }
    static int single(string x,vector<string>tag){
        int num=0;
        for(string y:tag){
            if(x.compare(y)==0){
                num++;
            }
        }
        return num;
    }
};
int main(int argc, char const *argv[])
{
    string str;
    vector<string> orn;
   
    while(cin>>str){
        orn.push_back(str);
    }
    vector<string> tags(Solution::tags(orn));
    cout<<Solution::tag_num(tags)<<std::endl;
    vector<string> tags_new(tags);
    sort( tags_new.begin(), tags_new.end() );
    tags_new.erase( unique( tags_new.begin(), tags_new.end() ), tags_new.end() );
    for(auto x:tags_new){
        cout<<x<<" "<<Solution::single(x,tags)<<std::endl;
    }
    return 0;
}

题目如下：

Answer 1

#include<iostream>
#include<unordered_map>
#include<string>
#include<sstream>
#include<algorithm>
using namespace std;
int main()
{
    string line;
    unordered_map<string, int> tags;
    getline(cin, line);
    int i = 0;
    string word = "";
    stringstream stream(line);
    while (stream >> word)
        if (word.size() > 1 && word[0] == '#' && count(word.begin(), word.end(), '#') == 1)tags[word]++;
    cout << tags.size() << endl;
    for (const auto tag : tags)
        cout << tag.first << " " << tag.second << endl;
}