From 1e2700a2f221a7e3ba5a67115a9191e646a3002b Mon Sep 17 00:00:00 2001
From: Max <git@maximhutz.me>
Date: Tue, 16 Dec 2025 20:22:52 -0500
Subject: [PATCH] fix: december

---
 pkg/product_of_array_except_self/main.go      | 25 +++++++++++++++++++
 pkg/product_of_array_except_self/main_test.go | 16 ++++++++++++
 2 files changed, 41 insertions(+)
 create mode 100644 pkg/product_of_array_except_self/main.go
 create mode 100644 pkg/product_of_array_except_self/main_test.go

diff --git a/pkg/product_of_array_except_self/main.go b/pkg/product_of_array_except_self/main.go
new file mode 100644
index 0000000..bf0c71c
--- /dev/null
+++ b/pkg/product_of_array_except_self/main.go
@@ -0,0 +1,25 @@
+package product_of_array_except_self
+
+func ProductExceptSelf(nums []int) []int {
+	result := []int{}
+
+	for range nums {
+		result = append(result, 1)
+	}
+
+	lower_sum := 1
+
+	for i := range len(nums) {
+		result[i] *= lower_sum
+		lower_sum *= nums[i]
+	}
+
+	upper_sum := 1
+
+	for i := range len(nums) {
+		result[len(nums)-1-i] *= upper_sum
+		upper_sum *= nums[len(nums)-1-i]
+	}
+
+	return result
+}
diff --git a/pkg/product_of_array_except_self/main_test.go b/pkg/product_of_array_except_self/main_test.go
new file mode 100644
index 0000000..5d3783e
--- /dev/null
+++ b/pkg/product_of_array_except_self/main_test.go
@@ -0,0 +1,16 @@
+package product_of_array_except_self_test
+
+import (
+	"testing"
+
+	"git.maximhutz.com/practice/pkg/product_of_array_except_self"
+	"github.com/stretchr/testify/assert"
+)
+
+func Test1(t *testing.T) {
+	assert.Equal(t, []int{24, 12, 8, 6}, product_of_array_except_self.ProductExceptSelf([]int{1, 2, 3, 4}))
+}
+
+func Test2(t *testing.T) {
+	assert.Equal(t, []int{0, 0, 9, 0, 0}, product_of_array_except_self.ProductExceptSelf([]int{-1, 1, 0, -3, 3}))
+}