#include <iostream>
using namespace std;
int main() {
    int n, i, k = 0, j, m = 0;
    cin >> n;
    int *a = new int[n];
    int *b = new int[n];
    for (i = 0; i < n; i++) {
        scanf("%d", &a[i]);
        if (a[i] == 2) {
            cin >> b[k];
            m = m ^ b[k];
            k++;
            cout << m << endl;
        } else {
            m = 0;
            for (j = 0; j < k; j++) {
                b[j] = b[j] + 1;
                m = m ^ b[j];
            }
            cout << m << endl;
        }
    }
    delete[] a;
    delete[] b;
    return 0;
}

/sandbox/1/a.c:1:9: fatal error: 'iostream' file not found
#include<iostream>
        ^~~~~~~~~~
1 error generated.