The problem statement is as follows

PS: Ignore the repeated input format in the problem statement.

Here is my code

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

void solve (int n, int q, string s ) {

    for(int i = 0;i<q;i++){
        string query;
        cin>>query;
        if(query =="pop_back"){

            s.pop_back();
            n--;
            
            
        }

        else if(query =="front"){

            cout<<s[0]<<'n';

        }        

        else if(query=="back"){
            cout<<s[n-1]<<'n';

        }

        else if (query=="sort"){

            int l,r;

            cin>>l>>r;
            if(l>r){
                swap(l,r);
            }

            sort(s.begin()+l-1,s.begin()+r);

            

        }

        else if (query=="reverse"){

            int l,r;
            if(l>r){
                swap(l,r);

            }
           
           
            reverse(s.begin()+l-1,s.begin()+r);
            cout<<s;
             
            
        }

        else if (query=="print") {
            int a;
            cin>>a;
            cout<<s[a-1]<<'n';

        }

        else if (query=="substr"){
                
                int l,r;
                cin>>l>>r;
                if (l>r){
                    swap(l,r);
                }
                
                string h = s.substr(l-1, r-l+1);
                cout<<h<<'n';
        }

        else {
            char x;
            cin>>x;
            s.push_back(x);
            n++;
        }



    }
          

 }

signed main () {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

        int n,q;
        cin>>n>>q;
        string s;
        cin>>s;
        
        solve(n,q,s);

}

This code doesnt’ work properly.
After debugging at my end I found that the reverse function is not working as expected.

For the input

10 1

Buzzworthy

reverse 5 6

The output obtained is the same word itself.

I cannot figure out why this is happening.
Apart from this if any more bugs are found please tell them to me.