variable sized arrays hackerrank code example

Example: variable sized arrays hackerrank

int n,q;
cin >> n >> q;
vector< vector > a(n);

// input each array
for (int i=0;i> k;

    for (int j=0;j> data;
        a[i].push_back(data);
    }
}

// do the queries
for (int i=0;i> x >> y;
    cout << a[x][y] << endl;
}