Merge pull request #984 from 0xff-dev/2419

Add solution and test-cases for problem 2419

Author: 6boris

leetcode/2401-2500/2419.Longest-Subarray-With-Maximum-Bitwise-AND/README.md

@@ -1,28 +1,36 @@
 # [2419.Longest Subarray With Maximum Bitwise AND][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
+You are given an integer array `nums` of size `n`.
+
+Consider a **non-empty** subarray from `nums` that has the **maximum** possible **bitwise AND**.
+
+- In other words, let `k` be the maximum value of the bitwise AND of **any** subarray of `nums`. Then, only subarrays with a bitwise AND equal to `k` should be considered.
+Return the length of the longest such subarray.
+
+The bitwise AND of an array is the bitwise AND of all the numbers in it.
+
+A **subarray** is a contiguous sequence of elements within an array.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [1,2,3,3,2,2]
+Output: 2
+Explanation:
+The maximum possible bitwise AND of a subarray is 3.
+The longest subarray with that value is [3,3], so we return 2.
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Longest Subarray With Maximum Bitwise AND
-```go
 ```
-
+Input: nums = [1,2,3,4]
+Output: 1
+Explanation:
+The maximum possible bitwise AND of a subarray is 4.
+The longest subarray with that value is [4], so we return 1.
+```
 
 ## 结语
 

leetcode/2401-2500/2419.Longest-Subarray-With-Maximum-Bitwise-AND/Solution.go

@@ -1,5 +1,22 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(nums []int) int {
+	m := 0
+	l := 0
+	ans := 0
+	for _, n := range nums {
+		if n == m {
+			l++
+			ans = max(ans, l)
+			continue
+		}
+		if n > m {
+			m = n
+			l = 1
+			ans = 1
+			continue
+		}
+		l = 0
+	}
+	return ans
 }

leetcode/2401-2500/2419.Longest-Subarray-With-Maximum-Bitwise-AND/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, 3, 3, 2, 2}, 2},
+		{"TestCase2", []int{1, 2, 3, 4}, 1},
 	}
 
 	//	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() {
 }