代码:
#include <bits/stdc++.h>
using namespace std;
int main()
{
int n;
cin >> n;
int a2,b2,a3,c;
string s,s1,s3,s4,s_;
cin >> s;
for (int i=0;i<n;i++)
{
cin >> c;
if (c==1)
{
cin >> s1;
s=s+s1;
cout << s <<endl;
}
if (c==2)
{
cin >> a2 >> b2;
s=s.substr(a2,b2);
cout << s <<endl;
}
if (c==3)
{
cin >> a3 >> s3;
s=s.substr(0,a3)+s3+s.substr(a3,s.length());
cout << s <<endl;
}
if (c==4)
{
cin >> s4;
cout << s.find(s4) <<endl;
}
}
return 0;
}