how to make 2d dp array in c++ with initialization? code example

Example 1: how to make a n*n 2d dynamic array in c++

int** a = new int*[rowCount];
for(int i = 0; i < rowCount; ++i)
    a[i] = new int[colCount];

Example 2: initialize 2d array c++

#include <array>
2 #include <iostream>
3
4 using namespace std;
5
6 //remember const!
7 const int ROWS = 2;
8 const int COLS = 3;


int main(){
 array<array<int, COLS>, ROWS> matrix = {
 1, 2, 3,
 4, 5, 6
 };
  
  
  return 0;
}