请看看我为什么RE了

Question

请看看我为什么RE了

#include <iostream>
#include <string>
#include <cmath>

using namespace std;

string s = " ";
int q;

int main() {
    for (cin >> q; q; q--) {
        char c;
        cin >> c;
        if (c == 'I') {
            int i;
            string x;
            cin >> i >> x;
            s.insert(i, x);
        }
        else {
            int x;
            cin >> x;
            s.replace(max(x - 1, 0), x, " ");
        }
    }
    cout << s << endl;
    return 0;
}

Answer 1

cin >> i >> x;
s.insert(i, x);
s.replace(max(x - 1, 0), x, " ");
这2处里i,x可能会越界