Add solution and test-cases for problem 3392

Author: 0xff-dev

leetcode/3301-3400/3392.Count-Subarrays-of-Length-Three-With-a-Condition/README.md

@@ -1,28 +1,31 @@
 # [3392.Count Subarrays of Length Three With a Condition][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`, return the number of subarrays of length 3 such that the sum of the first and third numbers equals exactly half of the second number.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
-```
+Input: nums = [1,2,1,4,1]
+
+Output: 1
+
+Explanation:
 
-## 题意
-> ...
+Only the subarray [1,4,1] contains exactly 3 elements where the sum of the first and third numbers equals half the middle number.
+```
 
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Count Subarrays of Length Three With a Condition
-```go
 ```
+Input: nums = [1,1,1]
+
+Output: 0
 
+Explanation:
+
+[1,1,1] is the only subarray of length 3. However, its first and third numbers do not add to half the middle number.
+```
 
 ## 结语
 

leetcode/3301-3400/3392.Count-Subarrays-of-Length-Three-With-a-Condition/Solution.go

@@ -1,5 +1,14 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(nums []int) int {
+	ans := 0
+	for i := 0; i < len(nums)-2; i++ {
+		a := nums[i]
+		b := nums[i+1]
+		c := nums[i+2]
+		if (a+c)*2 == b {
+			ans++
+		}
+	}
+	return ans
 }

leetcode/3301-3400/3392.Count-Subarrays-of-Length-Three-With-a-Condition/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, 2, 1, 4, 1}, 1},
+		{"TestCase2", []int{1, 1, 1}, 0},
 	}
 
 	//	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() {
 }