From 81c06097afddc5ef27775f56fe235f17f38ea0c7 Mon Sep 17 00:00:00 2001
From: Gourav Suri <gourav.suri@grabtaxi.com>
Date: Sat, 23 Oct 2021 01:43:14 +0530
Subject: [PATCH] added quick sort algorithm to the deck

---
 QuickSort/QuickSort.go      | 24 ++++++++++++++++++++++++
 QuickSort/QuickSort_test.go | 24 ++++++++++++++++++++++++
 README.md                   |  1 +
 3 files changed, 49 insertions(+)
 create mode 100644 QuickSort/QuickSort.go
 create mode 100644 QuickSort/QuickSort_test.go

diff --git a/QuickSort/QuickSort.go b/QuickSort/QuickSort.go
new file mode 100644
index 0000000..e334be9
--- /dev/null
+++ b/QuickSort/QuickSort.go
@@ -0,0 +1,24 @@
+package QuickSort
+
+import (
+	"math/rand"
+)
+
+func QuickSort(a []int) []int {
+	if len(a) < 2 {
+		return a
+	}
+	left, right := 0, len(a)-1
+	pivot := rand.Int() % len(a)
+	a[pivot], a[right] = a[right], a[pivot]
+	for i, _ := range a {
+		if a[i] < a[right] {
+			a[left], a[i] = a[i], a[left]
+			left++
+		}
+	}
+	a[left], a[right] = a[right], a[left]
+	QuickSort(a[:left])
+	QuickSort(a[left+1:])
+	return a
+}
\ No newline at end of file
diff --git a/QuickSort/QuickSort_test.go b/QuickSort/QuickSort_test.go
new file mode 100644
index 0000000..e0462d9
--- /dev/null
+++ b/QuickSort/QuickSort_test.go
@@ -0,0 +1,24 @@
+package QuickSort
+import (
+	"math/rand"
+	"sort"
+	"testing"
+	"time"
+)
+
+func TestSelectionSort(t *testing.T) {
+	random := rand.New(rand.NewSource(time.Now().UnixNano()))
+	array1 := make([]int, random.Intn(100-10)+10)
+	for i := range array1 {
+		array1[i] = random.Intn(100)
+	}
+	array2 := make(sort.IntSlice, len(array1))
+	copy(array2, array1)
+	QuickSort(array1)
+	array2.Sort()
+	for i := range array1 {
+		if array1[i] != array2[i] {
+			t.Fail()
+		}
+	}
+}
diff --git a/README.md b/README.md
index 90c81b4..1882109 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,7 @@ There are several data structures and algorithms implemented in this project. Th
 - Cocktail Sort
 - Gnome Sort
 - Merge Sort
+- Quick Sort
 
 ## Usage