Kronecker Product of two matrices

Given an m*n matrix A and a p*q matrix B, their Kronecker product C = A tensor B, also called their matrix direct product, is a (m*p) * (n*q) matrix. 

A tensor B = |a11B a12B|
 |a21B a22B|

= |a11b11 a11b12 a12b11 a12b12|
 |a11b21 a11b22 a12b21 a12b22| 
 |a11b31 a11b32 a12b31 a12b32|
 |a21b11 a21b12 a22b11 a22b12|
 |a21b21 a21b22 a22b21 a22b22|
 |a21b31 a21b32 a22b31 a22b32|

Examples:

1. The matrix direct(kronecker) product of the 2×2 matrix A 
 and the 2×2 matrix B is given by the 4×4 matrix :

Input : A = 1 2 B = 0 5
 3 4 6 7

Output : C = 0 5 0 10
 6 7 12 14
 0 15 0 20
 18 21 24 28

2. The matrix direct(kronecker) product of the 2×3 matrix A 
 and the 3×2 matrix B is given by the 6×6 matrix :

Input : A = 1 2 B = 0 5 2
 3 4 6 7 3
 1 0

Output : C = 0 5 2 0 10 4 
 6 7 3 12 14 6 
 0 15 6 0 20 8 
 18 21 9 24 28 12 
 0 5 2 0 0 0 
 6 7 3 0 0 0 

Below is the code to find the Kronecker Product of two matrices and stores it as matrix C : 

0 5 2 0 10 4 
6 7 3 12 14 6 
0 15 6 0 20 8 
18 21 9 24 28 12 
0 5 2 0 0 0 
6 7 3 0 0 0 

Time Complexity: O(rowa * rowb * cola * colb)
Auxiliary Space: O((rowa * rowb) * (cola * colb))