Add solution and test-cases for problem 795

Author: 0xff-dev

leetcode/701-800/0795.Number-of-Subarrays-with-Bounded-Maximum/README.md

@@ -1,28 +1,24 @@
 # [795.Number of Subarrays with Bounded Maximum][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 two integers `left` and `right`, return the number of contiguous non-empty **subarrays** such that the value of the maximum array element in that subarray is in the range `[left, right]`.
+
+The test cases are generated so that the answer will fit in a **32-bit** integer.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [2,1,4,3], left = 2, right = 3
+Output: 3
+Explanation: There are three subarrays that meet the requirements: [2], [2, 1], [3].
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Number of Subarrays with Bounded Maximum
-```go
 ```
-
+Input: nums = [2,9,2,5,6], left = 2, right = 8
+Output: 7
+```
 
 ## 结语
 

leetcode/701-800/0795.Number-of-Subarrays-with-Bounded-Maximum/Solution.go

@@ -1,5 +1,27 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(nums []int, left int, right int) int {
+	ans := 0
+	// 1, 2, 2, 1 [2,3]
+	//    2[1,2], [2]
+	//       2 [2], [2,2], [1,2,2], | [2,2,1], [1,2,2,1], [2,1]
+	//
+	for i := range nums {
+		if nums[i] >= left && nums[i] <= right {
+			li := i
+			for ; li >= 0 && nums[li] <= nums[i]; li-- {
+			}
+			left := i - li
+			ans += left
+
+			ri := i + 1
+			for ; ri < len(nums) && nums[ri] < nums[i]; ri++ {
+			}
+			ri--
+			if diff := ri - i; diff > 0 {
+				ans += diff * left
+			}
+		}
+	}
+	return ans
 }

leetcode/701-800/0795.Number-of-Subarrays-with-Bounded-Maximum/Solution_test.go

@@ -9,31 +9,32 @@ import (
 func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
-		name   string
-		inputs bool
-		expect bool
+		name        string
+		nums        []int
+		left, right int
+		expect      int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int{2, 1, 4, 3}, 2, 3, 3},
+		{"TestCase2", []int{2, 9, 2, 5, 6}, 2, 8, 7},
+		{"TestCase3", []int{1, 2, 2, 1}, 2, 3, 8},
 	}
 
 	//	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.nums, c.left, c.right)
 			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.nums, c.left, c.right)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }