Merge pull request #1153 from 0xff-dev/2401

Add solution and test-cases for problem 2401

Author: 6boris

leetcode/2401-2500/2401.Longest-Nice-Subarray/README.md

@@ -1,28 +1,35 @@
 # [2401.Longest Nice Subarray][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 array `nums` consisting of **positive** integers.
+
+We call a subarray of `nums` **nice** if the bitwise **AND** of every pair of elements that are in **different** positions in the subarray is equal to `0`.
+
+Return the length of the **longest** nice subarray.
+
+A **subarray** is a **contiguous** part of an array.
+
+**Note** that subarrays of length `1` are always considered nice.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [1,3,8,48,10]
+Output: 3
+Explanation: The longest nice subarray is [3,8,48]. This subarray satisfies the conditions:
+- 3 AND 8 = 0.
+- 3 AND 48 = 0.
+- 8 AND 48 = 0.
+It can be proven that no longer nice subarray can be obtained, so we return 3.
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Longest Nice Subarray
-```go
 ```
-
+Input: nums = [3,1,5,11,13]
+Output: 1
+Explanation: The length of the longest nice subarray is 1. Any subarray of length 1 can be chosen.
+```
 
 ## 结语
 

leetcode/2401-2500/2401.Longest-Nice-Subarray/Solution.go

@@ -1,5 +1,29 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(nums []int) int {
+	if len(nums) == 1 {
+		return 1
+	}
+
+	cur := 0
+	start, end := 0, 0
+	ans := 0
+	for ; end < len(nums); end++ {
+		if cur&nums[end] == 0 {
+			cur |= nums[end]
+			continue
+		}
+		ans = max(ans, end-start)
+
+		for ; start <= end; start++ {
+			cur ^= nums[start]
+			if cur&nums[end] == 0 {
+				start++
+				cur |= nums[end]
+				break
+			}
+		}
+	}
+	ans = max(ans, end-start)
+	return ans
 }

leetcode/2401-2500/2401.Longest-Nice-Subarray/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, 8, 48, 10}, 3},
+		{"TestCase2", []int{3, 1, 5, 11, 13}, 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() {
 }