Add solution and test-cases for problem 594

leetcode/501-600/0594.Longest-Harmonious-Subsequence/README.md

@@ -1,28 +1,33 @@
 # [594.Longest Harmonious Subsequence][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
+We define a harmonious array as an array where the difference between its maximum value and its minimum value is **exactly** `1`.
+
+Given an integer array `nums`, return the length of its longest harmonious subsequence among all its possible subsequences.
+
+A **subsequence** of array is a sequence that can be derived from the array by deleting some or no elements without changing the order of the remaining elements.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [1,3,2,2,5,2,3,7]
+Output: 5
+Explanation: The longest harmonious subsequence is [3,2,2,2,3].
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Longest Harmonious Subsequence
-```go
 ```
+Input: nums = [1,2,3,4]
+Output: 2
+```
+
+**Example 3:**
 
+```
+Input: nums = [1,1,1,1]
+Output: 0
+```
 
 ## 结语
 

leetcode/501-600/0594.Longest-Harmonious-Subsequence/Solution.go

@@ -1,5 +1,22 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+import "sort"
+
+func Solution(nums []int) int {
+	keys := make(map[int]int)
+	a := make([]int, 0)
+	for _, n := range nums {
+		if _, ok := keys[n]; !ok {
+			a = append(a, n)
+		}
+		keys[n]++
+	}
+	sort.Ints(a)
+	ans := 0
+	for i := 1; i < len(a); i++ {
+		if a[i]-a[i-1] == 1 && keys[a[i]]+keys[a[i-1]] > ans {
+			ans = keys[a[i]] + keys[a[i-1]]
+		}
+	}
+	return ans
 }

leetcode/501-600/0594.Longest-Harmonious-Subsequence/Solution_test.go

@@ -10,12 +10,12 @@ 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, 2, 2, 5, 2, 3, 7}, 5},
+		{"TestCase2", []int{1, 2, 3, 4}, 2},
+		{"TestCase3", []int{1, 1, 1, 1}, 0},
 	}
 
 	//	开始测试
@@ -30,10 +30,10 @@ 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() {
 }