Determinant Of Matrix

A
```package com.thealgorithms.maths;

import java.util.Scanner;

/*
* @author Ojasva Jain
* Determinant of a Matrix Wikipedia link: https://en.wikipedia.org/wiki/Determinant
*/
public final class DeterminantOfMatrix {
private DeterminantOfMatrix() {
}

// Determinant calculator
//@return determinant of the input matrix
static int determinant(int[][] a, int n) {
int det = 0;
int sign = 1;
int p = 0;
int q = 0;
if (n == 1) {
det = a[0][0];
} else {
int[][] b = new int[n - 1][n - 1];
for (int x = 0; x < n; x++) {
p = 0;
q = 0;
for (int i = 1; i < n; i++) {
for (int j = 0; j < n; j++) {
if (j != x) {
b[p][q++] = a[i][j];
if (q % (n - 1) == 0) {
p++;
q = 0;
}
}
}
}
det = det + a[0][x] * determinant(b, n - 1) * sign;
sign = -sign;
}
}
return det;
}

// Driver Method
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
// Input Matrix
System.out.println("Enter matrix size (Square matrix only)");
int n = in.nextInt();
System.out.println("Enter matrix");
int[][] a = new int[n][n];
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
a[i][j] = in.nextInt();
}
}
System.out.println(determinant(a, n));
in.close();
}
}
```