From 0a3054877e0c75feca5582959f242139825d5c73 Mon Sep 17 00:00:00 2001
From: Max <max.schulte8@gmail.com>
Date: Wed, 26 Feb 2020 23:03:59 +0100
Subject: [PATCH] Determinanten nebenlaeufig

---
 main.go | 56 +++++++++++++++++++++++++++++++++-----------------------
 1 file changed, 33 insertions(+), 23 deletions(-)

diff --git a/main.go b/main.go
index aeeea5c..0867ca3 100644
--- a/main.go
+++ b/main.go
@@ -27,30 +27,15 @@ func checkMat(mat [][]int) {
 func getDet(mat [][]int) int {
 	if len(mat) > 1 {
 		erg := 0
-		neg := 0
+		neg := false
+		var ch = make(chan int)
 		for i := 0; i < len(mat); i++ {
-			mat1 := [][]int{}
-			for j := 0; j < len(mat); j++ {
-				if j == i {
-					continue
-				}
-				mat1 = append(mat1, []int{})
-				for k := 1; k < len(mat[j]); k++ {
-					if j < i {
-						mat1[j] = append(mat1[j], mat[j][k])
-					} else {
-						mat1[j-1] = append(mat1[j-1], mat[j][k])
-					}
-				}
-
-			}
-			if neg == 0 {
-				erg = erg + mat[i][0]*getDet(mat1)
-				neg = 1
-			} else {
-				erg = erg - mat[i][0]*getDet(mat1)
-				neg = 0
-			}
+			go singleDet(mat, neg, i, ch)
+			neg = !neg
+		}
+		for i := 0; i < len(mat); i++ {
+			zw := <-ch
+			erg = erg + zw
 		}
 		return erg
 	} else {
@@ -59,6 +44,31 @@ func getDet(mat [][]int) int {
 
 }
 
+func singleDet(mat [][]int, neg bool, i int, ch chan int) {
+	erg := 0
+	mat1 := [][]int{}
+	for j := 0; j < len(mat); j++ {
+		if j == i {
+			continue
+		}
+		mat1 = append(mat1, []int{})
+		for k := 1; k < len(mat[j]); k++ {
+			if j < i {
+				mat1[j] = append(mat1[j], mat[j][k])
+			} else {
+				mat1[j-1] = append(mat1[j-1], mat[j][k])
+			}
+		}
+
+	}
+	if !neg {
+		erg = erg + mat[i][0]*getDet(mat1)
+	} else {
+		erg = erg - mat[i][0]*getDet(mat1)
+	}
+	ch <- erg
+}
+
 func outMat(mat [][]int) {
 	for i := 0; i < len(mat); i++ {
 		for j := 0; j < len(mat[0]); j++ {