Variable Sized Arrays in C++ - Hacker Rank Solution

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#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#define MAX 1000
using namespace std;


int main() 
{
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int arr1[MAX][MAX],size[MAX];
    int n,q,s,pos1,pos2;
    cout<<"Enter a Number of Array";
    cin>>n>>q; 
    for(int i=0;i<n;i++)
    {
       cout<<"Enter a size of array";
       cin>>s;
       for(int j=0;j<s;j++)
       {
            cin>>arr1[i][j];
       } 
        
    }
    for(int i=0;i<q;i++)
    {
        cout<<"Enter a position";
        cin>>pos1>>pos2;
        cout<<arr1[pos1][pos2]<<"\n";
    }
    return 0;
}

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#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    int q;
    cin >> n >> q;
    vector<int> a[n];
    for(int i = 0; i < n; i++){
        int m;
        cin >> m;
        int o;
        for(int j = 0; j < m; j++){
            cin >> o;
            a[i].push_back(o);
        }
    }
    
    int r, s;
    for(int k = 1; k <= q; k++){
        cin >> r >> s;
        cout << a[r][s] << endl;
    }
    return 0;
}