Merge pull request #1270 from 0xff-dev/3487

Add solution and test-cases for problem 3487

Author: 6boris

leetcode/3401-3500/3487.Maximum-Unique-Subarray-Sum-After-Deletion/README.md

@@ -1,28 +1,50 @@
 # [3487.Maximum Unique Subarray Sum After Deletion][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`.
+
+You are allowed to delete any number of elements from `nums` without making it **empty**. After performing the deletions, select a subarray of `nums` such that:
+
+1. All elements in the subarray are **unique**.
+2. The sum of the elements in the subarray is **maximized**.
+
+Return the **maximum sum** of such a subarray.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [1,2,3,4,5]
+
+Output: 15
+
+Explanation:
+
+Select the entire array without deleting any element to obtain the maximum sum.
+```
+
+**Example 2:**
+
 ```
+Input: nums = [1,1,0,1,1]
+
+Output: 1
+
+Explanation:
 
-## 题意
-> ...
+Delete the element nums[0] == 1, nums[1] == 1, nums[2] == 0, and nums[3] == 1. Select the entire array [1] to obtain the maximum sum.
+```
 
-## 题解
+**Example 3:**
 
-### 思路1
-> ...
-Maximum Unique Subarray Sum After Deletion
-```go
 ```
+Input: nums = [1,2,-1,-2,1,0,-1]
+
+Output: 3
 
+Explanation:
+
+Delete the elements nums[2] == -1 and nums[3] == -2, and select the subarray [2, 1] from [1, 2, 1, 0, -1] to obtain the maximum sum.
+```
 
 ## 结语
 

leetcode/3401-3500/3487.Maximum-Unique-Subarray-Sum-After-Deletion/Solution.go

@@ -1,5 +1,24 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+import "sort"
+
+func Solution(nums []int) int {
+	l := len(nums)
+	sort.Ints(nums)
+	index := sort.Search(l, func(i int) bool {
+		return nums[i] >= 0
+	})
+	sum := nums[l-1]
+	if index == l {
+		return sum
+	}
+	pre := sum
+	for i := l - 2; i >= index; i-- {
+		if nums[i] == pre {
+			continue
+		}
+		pre = nums[i]
+		sum += nums[i]
+	}
+	return sum
 }

leetcode/3401-3500/3487.Maximum-Unique-Subarray-Sum-After-Deletion/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, 2, 3, 4, 5}, 15},
+		{"TestCase2", []int{1, 1, 0, 1, 1}, 1},
+		{"TestCase3", []int{1, 2, -1, -2, 1, 0, -1}, 3},
 	}
 
 	//	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() {
 }