Change project structure to a Maven Java project + Refactor (#2816)

src/main/java/com/thealgorithms/maths/DeterminantOfMatrix.java

@@ -0,0 +1,55 @@
+package com.thealgorithms.maths;
+
+import java.util.*;
+
+/* 
+* @author Ojasva Jain
+* Determinant of Matrix Wikipedia link : https://en.wikipedia.org/wiki/Determinant
+ */
+public class DeterminantOfMatrix {
+
+    // Determinant calculator
+    //@return determinant of the input matrix
+    static int determinant(int a[][], int n) {
+        int det = 0, sign = 1, p = 0, 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));
+    }
+}