diff --git a/leetcode/3601-3700/3606.Coupon-Code-Validator/README.md b/leetcode/3601-3700/3606.Coupon-Code-Validator/README.md
index 84f3a220..5fa8ba9f 100755
--- a/leetcode/3601-3700/3606.Coupon-Code-Validator/README.md
+++ b/leetcode/3601-3700/3606.Coupon-Code-Validator/README.md
@@ -1,28 +1,48 @@
 # [3606.Coupon Code Validator][title]
 
-> [!WARNING|style:flat]
-> This question is temporarily unanswered if you have good ideas. Welcome to [Create Pull Request PR](https://github.com/kylesliu/awesome-golang-algorithm)
-
 ## Description
+You are given three arrays of length n that describe the properties of `n` coupons: `code`, `businessLine`, and `isActive`. The `ith` coupon has:
+
+- `code[i]`: a **string** representing the coupon identifier.
+- `businessLine[i]`: a **string** denoting the business category of the coupon.
+- `isActive[i]`: a **boolean** indicating whether the coupon is currently active.
+
+A coupon is considered **valid** if all of the following conditions hold:
+
+- `code[i]` is non-empty and consists only of alphanumeric characters (a-z, A-Z, 0-9) and underscores (`_`).
+- `businessLine[i]` is one of the following four categories: `"electronics"`, `"grocery`, `"pharmacy`, `"restaurant"`.
+- `isActive[i]` is **true**.
+
+Return an array of the **codes***codes** all valid coupons, **sorted** first by their **businessLine** in the order: `"electronics"`, `"grocery"`, `"pharmacy"`, `"restaurant"`, and then by **code** in lexicographical (ascending) order within each category.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
-```
+Input: code = ["SAVE20","","PHARMA5","SAVE@20"], businessLine = ["restaurant","grocery","pharmacy","restaurant"], isActive = [true,true,true,true]
 
-## 题意
-> ...
+Output: ["PHARMA5","SAVE20"]
 
-## 题解
+Explanation:
 
-### 思路1
-> ...
-Coupon Code Validator
-```go
+First coupon is valid.
+Second coupon has empty code (invalid).
+Third coupon is valid.
+Fourth coupon has special character @ (invalid).
 ```
 
+**Example 2:**
+
+```
+Input: code = ["GROCERY15","ELECTRONICS_50","DISCOUNT10"], businessLine = ["grocery","electronics","invalid"], isActive = [false,true,true]
+
+Output: ["ELECTRONICS_50"]
+
+Explanation:
+
+First coupon is inactive (invalid).
+Second coupon is valid.
+Third coupon has invalid business line (invalid).
+```
 
 ## 结语
 
diff --git a/leetcode/3601-3700/3606.Coupon-Code-Validator/Solution.go b/leetcode/3601-3700/3606.Coupon-Code-Validator/Solution.go
index d115ccf5..fa5c78f2 100644
--- a/leetcode/3601-3700/3606.Coupon-Code-Validator/Solution.go
+++ b/leetcode/3601-3700/3606.Coupon-Code-Validator/Solution.go
@@ -1,5 +1,44 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+import "sort"
+
+func validateCode(str string) bool {
+	for _, b := range str {
+		if !(b >= 'a' && b <= 'z' || b >= 'A' && b <= 'Z' || b >= '0' && b <= '9' || b == '_') {
+			return false
+		}
+	}
+	return len(str) > 0
+}
+
+func Solution(code []string, businessLine []string, isActive []bool) []string {
+
+	indies := make([]int, 0)
+	order := map[string]int{
+		"electronics": 1, "grocery": 2, "pharmacy": 3, "restaurant": 4,
+	}
+	for index := range code {
+		if !validateCode(code[index]) || !isActive[index] {
+			continue
+		}
+		if _, ok := order[businessLine[index]]; !ok {
+			continue
+		}
+		indies = append(indies, index)
+	}
+
+	sort.Slice(indies, func(i, j int) bool {
+		a, b := businessLine[indies[i]], businessLine[indies[j]]
+		if a == b {
+			return code[indies[i]] < code[indies[j]]
+		}
+		return order[a] < order[b]
+	})
+
+	ret := make([]string, len(indies))
+	for i := range indies {
+		ret[i] = code[indies[i]]
+	}
+
+	return ret
 }
diff --git a/leetcode/3601-3700/3606.Coupon-Code-Validator/Solution_test.go b/leetcode/3601-3700/3606.Coupon-Code-Validator/Solution_test.go
index 14ff50eb..e365af1a 100644
--- a/leetcode/3601-3700/3606.Coupon-Code-Validator/Solution_test.go
+++ b/leetcode/3601-3700/3606.Coupon-Code-Validator/Solution_test.go
@@ -9,31 +9,31 @@ import (
 func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
-		name   string
-		inputs bool
-		expect bool
+		name               string
+		code, businessLine []string
+		isActive           []bool
+		expect             []string
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []string{"SAVE20", "", "PHARMA5", "SAVE@20"}, []string{"restaurant", "grocery", "pharmacy", "restaurant"}, []bool{true, true, true, true}, []string{"PHARMA5", "SAVE20"}},
+		{"TestCase2", []string{"GROCERY15", "ELECTRONICS_50", "DISCOUNT10"}, []string{"grocery", "electronics", "invalid"}, []bool{false, true, true}, []string{"ELECTRONICS_50"}},
 	}
 
 	//	开始测试
 	for i, c := range cases {
 		t.Run(c.name+" "+strconv.Itoa(i), func(t *testing.T) {
-			got := Solution(c.inputs)
+			got := Solution(c.code, c.businessLine, c.isActive)
 			if !reflect.DeepEqual(got, c.expect) {
-				t.Fatalf("expected: %v, but got: %v, with inputs: %v",
-					c.expect, got, c.inputs)
+				t.Fatalf("expected: %v, but got: %v, with inputs: %v %v %v",
+					c.expect, got, c.code, c.businessLine, c.isActive)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }