20分只对最后一个求调，本地测第一个测试点输出正确

#include <bits/stdc++.h>
#define ll long long
#define db double
#define bl bool
#define itn int
using namespace std;

const int N = 100;
itn n,pd;
string s;
string b;
int p1,p2;
int main(){
    cin>>n>>s;
    for (int i = 0; i < n; ++i) {
        cin>>pd;
        if(pd==1)
        {
            cin>>b;
            s=s+b;
            cout<<s<<endl;
        }
        if(pd==2)
        {
            cin>>p1>>p2;
            s=s.substr(p1,p2);
            cout <<s<<endl;
        }
        if(pd==3)
        {
            cin>>p1>>b;
            s.insert(p1,b);
            cout<<s<<endl;
        }
        if(pd==4)
        {
            cin>>b;
            bool p=false;
            for (int j = 0; j <= s.size()-b.size(); ++j) {
                if(s.substr(j,b.size())==b){
                    cout<<j;
                    p = true;
                    break;
                }
            }
            if(!p)cout<<"-1"<<endl;
        }
    }
}