题解 | 2023_AQIP 操作_1567

#include<iostream>
#include<algorithm>
using namespace std;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    string s;
    int m;
    cin >> s >> m;
    while (m--) {
        char op;
        cin >> op;
        switch (op) {
            case 'A': {
                char c;
                cin >> c;
                s.push_back(c);
                break;
            }
            case 'I': {
                int index;
                cin >> index;
                char c;
                cin >> c;
                s.insert(s.begin() + index - 1, c);
                break;
            }
            case 'Q':
                char c;
                cin >> c;
                cout << count(s.begin(), s.end(), c) << endl;
                break;
            case 'P':
                for_each(s.begin(), s.end(), [](const auto &c) { cout << c << ' '; });
                cout << endl;
                break;
            default:
                break;
        }
    }
    return 0;
}