The question was tricky and a bit hard to understand it was difficult to understand the k maybe bcz i am just a beginner int N, Q; cin >> N >> Q;

int* arr[N];

for(int i = 0; i < N; i++ ){
    int k;
    cin >> k;
    arr[i] = new int[k];
    for(int j = 0; j < k; j++){
        cin >> arr[i][j];
    }
}
for(int i = 0; i < Q; i++){
    int a, b;
    cin >> a >> b;
    cout << arr[a][b] << endl;
}