Add solution and test-cases for problem 1343

leetcode/1301-1400/1343.Number-of-Sub-arrays-of-Size-K-and-Average-Greater-than-or-Equal-to-Threshold/README.md

@@ -1,28 +1,23 @@
 # [1343.Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold][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 array of integers `arr` and two integers k and `threshold`, return the number of sub-arrays of size `k` and average greater than or equal to `threshold`.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: arr = [2,2,2,2,5,5,5,8], k = 3, threshold = 4
+Output: 3
+Explanation: Sub-arrays [2,5,5],[5,5,5] and [5,5,8] have averages 4, 5 and 6 respectively. All other sub-arrays of size 3 have averages less than 4 (the threshold).
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold
-```go
 ```
-
+Input: arr = [11,13,17,23,29,31,7,5,2,3], k = 3, threshold = 5
+Output: 6
+Explanation: The first 6 sub-arrays of size 3 have averages greater than 5. Note that averages are not integers.
+```
 
 ## 结语
 

leetcode/1301-1400/1343.Number-of-Sub-arrays-of-Size-K-and-Average-Greater-than-or-Equal-to-Threshold/Solution.go

@@ -1,5 +1,23 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(arr []int, k int, threshold int) int {
+	ans := 0
+	sum := 0
+	for i := 0; i < k; i++ {
+		sum += arr[i]
+	}
+	if sum/k >= threshold {
+		ans++
+	}
+	start := 0
+	// 1, 2, 3
+	for i := k; i < len(arr); i++ {
+		sum -= arr[start]
+		sum += arr[i]
+		if sum/k >= threshold {
+			ans++
+		}
+		start++
+	}
+	return ans
 }

leetcode/1301-1400/1343.Number-of-Sub-arrays-of-Size-K-and-Average-Greater-than-or-Equal-to-Threshold/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
+		inputs       []int
+		k, threshold int
+		expect       int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int{2, 2, 2, 2, 5, 5, 5, 8}, 3, 4, 3},
+		{"TestCase2", []int{11, 13, 17, 23, 29, 31, 7, 5, 2, 3}, 3, 5, 6},
 	}
 
 	//	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, c.threshold)
 			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.inputs, c.k, c.threshold)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }