Vector of Pairs of integers

I'm asked to get a value N and I will then get N pairs of values. These pairs will be the size of my 2D array, and this 2D array's elements will range from 1 to the size of the 2D array.

Sample input:

N = 2

Two pairs of values are

(2,3)
(3,4)

Sample output:

{(1,2,3),(4,5,6)}
{(1,2,3,4),(5,6,7,8),(9,10,11,12)}

The below code is what I have tried. I'm still a beginner so kindly help me.

#include<bits/stdc++.h>
using namespace std;

makeArray(int a, int b){
   int arr[a][b];
   int temp = 1;
   cout<<"[";
   for(int i=1; i<=a; i++){
       cout<<"[";
       for(int j=1; j<=b; j++){
           cout<<temp<<",";
       }
       cout<<"]";
   }
   cout<<"]";
}

int main() {
   int n;
   cin>>n;
   int a,b;
   vector<pair<int,int>> ip;
   for(int i=0; i<n; i++){
       cin>>a;
       cin>>b;
       ip.push_back(make_pair(a,b));
   }
   for (int x=0; x<n; x++)
   {
       makeArray(ip.first, ip.second);
       cout<<endl;
   }
   return 0;
}

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