the code is simple and easy but problem's description got me stuck.

public static List dynamicArray(int n, List> queries) { List> arr = new List>(); for(int i = 0; i < n; i++){ arr.Add(new List()); }

    List<int> answersArray = new List<int>();
    int lastAnswer = 0;

    for(int i = 0; i < queries.Count; i++){
        int x = queries[i][1];
        int y = queries[i][2];

        if(queries[i][0] == 1){
            int idx = (x^lastAnswer) % n;
            arr[idx].Add(y);
        }else if(queries[i][0] == 2){
            int idx = (x ^ lastAnswer) % n;
            lastAnswer = arr[idx][y % arr[idx].Count];
            answersArray.Add(lastAnswer);
        }
    }
    return answersArray;
}

}