802G - Fake News (easy) - CodeForces Solution

#include <bits/stdc++.h>
using namespace std;

int main()
{
    string s;
    cin >> s;
    unordered_map<char,vector<int>>mp;
    for(int i = 0;i < s.length(); i++)
    {
        if(s[i] == 'h' || s[i] == 'e' || s[i] == 'i' || s[i] == 'd')
        {
            mp[s[i]].push_back(i);
        }
    }
    bool isvalid = true;
    if(mp.find('h') == mp.end() || mp.find('e') == mp.end() || mp.find('i') == mp.end() || mp.find('d') == mp.end())
    {
        cout<<"NO"<<endl;
        return 0;
    }
    int ind = mp['h'][0];
    if(lower_bound(mp['e'].begin(),mp['e'].end(),ind) == mp['e'].end())
    {
        cout<<"NO"<<endl;
        return 0;
    }else
    {
        ind = *lower_bound(mp['e'].begin(),mp['e'].end(),ind);
    }
    if(lower_bound(mp['i'].begin(),mp['i'].end(),ind) == mp['i'].end())
    {
        cout<<"NO"<<endl;
        return 0;
    }else
    {
        ind = *lower_bound(mp['i'].begin(),mp['i'].end(),ind);
    }
    if(lower_bound(mp['d'].begin(),mp['d'].end(),ind) == mp['d'].end())
    {
        cout<<"NO"<<endl;
        return 0;
    }else
    {
        ind = *lower_bound(mp['d'].begin(),mp['d'].end(),ind);
    }
    if(lower_bound(mp['i'].begin(),mp['i'].end(),ind) == mp['i'].end())
    {
        cout<<"NO"<<endl;
        return 0;
    }else
    {
        ind = *lower_bound(mp['i'].begin(),mp['i'].end(),ind);
    }
    cout<<"YES"<<endl;
    return 0;
}