Add solution and test-cases for problem 2150

Author: 0xff-dev

leetcode/2101-2200/2150.Find-All-Lonely-Numbers-in-the-Array/README.md

@@ -1,28 +1,35 @@
 # [2150.Find All Lonely Numbers in the Array][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`. A number `x` is **lonely** when it appears only **once**, and no **adjacent** numbers (i.e. `x + 1` and `x - 1`) appear in the array.
+
+Return **all** lonely numbers in `nums`. You may return the answer in **any order**.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [10,6,5,8]
+Output: [10,8]
+Explanation: 
+- 10 is a lonely number since it appears exactly once and 9 and 11 does not appear in nums.
+- 8 is a lonely number since it appears exactly once and 7 and 9 does not appear in nums.
+- 5 is not a lonely number since 6 appears in nums and vice versa.
+Hence, the lonely numbers in nums are [10, 8].
+Note that [8, 10] may also be returned.
 ```
 
-## 题意
-> ...
-
-## 题解
+**Example 2:**
 
-### 思路1
-> ...
-Find All Lonely Numbers in the Array
-```go
 ```
-
+Input: nums = [1,3,5,3]
+Output: [1,5]
+Explanation: 
+- 1 is a lonely number since it appears exactly once and 0 and 2 does not appear in nums.
+- 5 is a lonely number since it appears exactly once and 4 and 6 does not appear in nums.
+- 3 is not a lonely number since it appears twice.
+Hence, the lonely numbers in nums are [1, 5].
+Note that [5, 1] may also be returned.
+```
 
 ## 结语
 

leetcode/2101-2200/2150.Find-All-Lonely-Numbers-in-the-Array/Solution.go

@@ -1,5 +1,20 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(nums []int) []int {
+	cnt := make(map[int]int)
+	for _, n := range nums {
+		cnt[n]++
+	}
+	ans := make([]int, 0)
+	for _, n := range nums {
+		if cnt[n] != 1 {
+			continue
+		}
+		_, ok1 := cnt[n-1]
+		_, ok2 := cnt[n+1]
+		if !ok1 && !ok2 {
+			ans = append(ans, n)
+		}
+	}
+	return ans
 }

leetcode/2101-2200/2150.Find-All-Lonely-Numbers-in-the-Array/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{10, 6, 5, 8}, []int{10, 8}},
+		{"TestCase2", []int{1, 3, 5, 3}, []int{1, 5}},
 	}
 
 	//	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() {
 }