P5734 【深基6.例6】文字处理软件

题目传送门

#include <bits/stdc++.h>

using namespace std;
string s, a;
int n;
int opt;
int l, cnt;

int main() {
    cin >> n >> s;
    while (n--) {
        cin >> opt;
        switch (opt) {
            case 1:
                cin >> a;
                s.append(a);
                printf("%s\n", s.c_str());
                break;
            case 2:
                cin >> l >> cnt;
                s = s.substr(l, cnt);
                printf("%s\n", s.c_str());
                break;
            case 3:
                cin >> l >> a;
                s.insert(l, a);
                printf("%s\n", s.c_str());
                break;
            case 4:
                cin >> a;
                auto pos = s.find(a);
                if (pos != s.npos) printf("%d\n", pos);
                else printf("%d\n", -1);
                break;
        }
    }
    return 0;
}