2 files changed, 49 insertions, 0 deletions
diff --git a/1339/go.mod b/1339/go.mod
new file mode 100644
index 0000000..aa2e740
--- /dev/null
+++ b/1339/go.mod
@@ -0,0 +1,3 @@
+module 1339
+
+go 1.19
diff --git a/1339/main.go b/1339/main.go
new file mode 100644
index 0000000..8eed077
--- /dev/null
+++ b/1339/main.go
@@ -0,0 +1,46 @@
+package main
+
+import (
+	"fmt"
+)
+
+type TreeNode struct {
+	Val   int
+	Left  *TreeNode
+	Right *TreeNode
+}
+
+func max(a, b int64) int64 {
+	if a > b {
+		return int64(a)
+	} else {
+		return int64(b)
+	}
+}
+
+func maxProduct(root *TreeNode) int {
+	var total int64
+	var result int64
+
+	var sumUnder func(*TreeNode) int64
+	sumUnder = func(node *TreeNode) int64 {
+		var sum int64
+		if node == nil {
+			return 0
+		}
+
+		sum = sumUnder(node.Left) + sumUnder(node.Right) + int64(node.Val)
+		result = max(int64(result), sum*(total-sum))
+
+		return sum
+	}
+
+	total = sumUnder(root)
+	sumUnder(root)
+
+	return int(result % (1_000_000_000 + 7))
+}
+
+func main() {
+	fmt.Println("vim-go")
+}