Add solution and test-cases for problem 2799

leetcode/2701-2800/2799.Count-Complete-Subarrays-in-an-Array/README.md

@@ -0,0 +1,35 @@
+# [2799.Count Complete Subarrays in an Array][title]
+
+## Description
+You are given an array `nums` consisting of **positive** integers.
+
+We call a subarray of an array **complete** if the following condition is satisfied:
+
+- The number of **distinct** elements in the subarray is equal to the number of distinct elements in the whole array.
+
+Return the number of **complete** subarrays.
+
+A **subarray** is a contiguous non-empty part of an array.
+
+**Example 1:**
+
+```
+Input: nums = [1,3,1,2,2]
+Output: 4
+Explanation: The complete subarrays are the following: [1,3,1,2], [1,3,1,2,2], [3,1,2] and [3,1,2,2].
+```
+
+**Example 2:**
+
+```
+Input: nums = [5,5,5,5]
+Output: 10
+Explanation: The array consists only of the integer 5, so any subarray is complete. The number of subarrays that we can choose is 10.
+```
+
+## 结语
+
+如果你同我一样热爱数据结构、算法、LeetCode，可以关注我 GitHub 上的 LeetCode 题解：[awesome-golang-algorithm][me]
+
+[title]: https://leetcode.com/problems/count-complete-subarrays-in-an-array
+[me]: https://github.com/kylesliu/awesome-golang-algorithm

leetcode/2701-2800/2799.Count-Complete-Subarrays-in-an-Array/Solution.go

@@ -1,5 +1,23 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(nums []int) int {
+	in := make(map[int]struct{})
+	for _, n := range nums {
+		in[n] = struct{}{}
+	}
+	distinct := len(in)
+	ans := 0
+	for i := 0; i < len(nums); i++ {
+		ti := map[int]struct{}{nums[i]: {}}
+		if len(ti) == distinct {
+			ans++
+		}
+		for pre := i - 1; pre >= 0; pre-- {
+			ti[nums[pre]] = struct{}{}
+			if len(ti) == distinct {
+				ans++
+			}
+		}
+	}
+	return ans
 }

leetcode/2701-2800/2799.Count-Complete-Subarrays-in-an-Array/Solution_test.go

@@ -10,12 +10,11 @@ func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
 		name   string
-		inputs bool
-		expect bool
+		inputs []int
+		expect int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int{1, 3, 1, 2, 2}, 4},
+		{"TestCase2", []int{5, 5, 5, 5}, 10},
 	}
 
 	//	开始测试
@@ -30,10 +29,10 @@ func TestSolution(t *testing.T) {
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }