Add solution and test-cases for problem 992

leetcode/901-1000/0992.Subarrays-with-K-Different-Integers/README.md

@@ -1,28 +1,29 @@
 # [992.Subarrays with K Different Integers][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
+Given an integer array `nums` and an integer `k`, return the number of **good subarrays** of `nums`.
+
+A **good array** is an array where the number of different integers in that array is exactly `k`.
+
+- For example, `[1,2,3,1,2]` has `3` different integers: `1`, `2`, and `3`.
+
+A **subarray** is a **contiguous** part of an array.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [1,2,1,2,3], k = 2
+Output: 7
+Explanation: Subarrays formed with exactly 2 different integers: [1,2], [2,1], [1,2], [2,3], [1,2,1], [2,1,2], [1,2,1,2]
 ```
 
-## 题意
-> ...
+**Example 2: **
 
-## 题解
-
-### 思路1
-> ...
-Subarrays with K Different Integers
-```go
 ```
-
+Input: nums = [1,2,1,3,4], k = 3
+Output: 3
+Explanation: Subarrays formed with exactly 3 different integers: [1,2,1,3], [2,1,3], [1,3,4].
+```
 
 ## 结语
 

leetcode/901-1000/0992.Subarrays-with-K-Different-Integers/Solution.go

@@ -1,5 +1,30 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(nums []int, k int) int {
+	ll := len(nums)
+	count := make([]int, ll+1)
+	ans := 0
+	l, r := 0, 0
+	cc := 0
+	for ; r < ll; r++ {
+		count[nums[r]]++
+		if count[nums[r]] == 1 {
+			k--
+		}
+		if k < 0 {
+			count[nums[l]]--
+			l++
+			k++
+			cc = 0
+		}
+		if k == 0 {
+			for count[nums[l]] > 1 {
+				count[nums[l]]--
+				l++
+				cc++
+			}
+			ans += (cc + 1)
+		}
+	}
+	return ans
 }

leetcode/901-1000/0992.Subarrays-with-K-Different-Integers/Solution_test.go

@@ -10,30 +10,30 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		inputs []int
+		k      int
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int{1, 2, 1, 2, 3}, 2, 7},
+		{"TestCase2", []int{1, 2, 1, 3, 4}, 3, 3},
 	}
 
 	//	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.inputs, c.k)
 			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",
+					c.expect, got, c.inputs, c.k)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }