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```class Solution
{
//Function to get cofactor of matrix[p][q] in temp[][].
static void getCofactor(int matrix[][], int temp[][], int p, int q, int n)
{
int i = 0, j = 0;

for (int row = 0; row < n; row++)
{
for (int col = 0; col < n; col++)
{
//copying only those elements into temporary matrix
//which are not in given row and column.
if(row != p && col != q)
{
temp[i][j++] = matrix[row][col];

//if row is filled, we increase row index and
//reset column index.
if(j == n - 1)
{
j = 0;
i++;
}
}
}
}
}

//Function for finding determinant of matrix.
static int determinantOfMatrix(int matrix[][], int n)
{
int D = 0;

//base case
if (n == 1)
return matrix;

//creating a list to store Cofactors.
int temp[][]  = new int[n][n];

int sign = 1;

//iterating for each element of first row.
for (int i = 0; i < n; i++)
{
//getting Cofactor of matrix[i].
getCofactor(matrix, temp, 0, i, n);
D += sign * matrix[i] * determinantOfMatrix(temp, n - 1);

//terms are to be added with alternate sign so changing the sign.
sign = -sign;
}
//returning the determinant.
return D;
}
}```