Merge pull request #867 from 0xff-dev/2441

Add solution and test-cases for problem 2441

Author: 6boris

leetcode/2401-2500/2441.Largest-Positive-Integer-That-Exists-With-Its-Negative/README.md

@@ -1,28 +1,33 @@
 # [2441.Largest Positive Integer That Exists With Its Negative][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
+Given an integer array nums that **does not contain** any zeros, find **the largest positive** integer `k` such that `-k` also exists in the array.
+
+Return the positive integer `k`. If there is no such integer, return `-1`.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: nums = [-1,2,-3,3]
+Output: 3
+Explanation: 3 is the only valid k we can find in the array.
 ```
 
-## 题意
-> ...
+**Exists 2:**
 
-## 题解
-
-### 思路1
-> ...
-Largest Positive Integer That Exists With Its Negative
-```go
+```
+Input: nums = [-1,10,6,7,-7,1]
+Output: 7
+Explanation: Both 1 and 7 have their corresponding negative values in the array. 7 has a larger value.
 ```
 
+**Exists 3:**
+
+```
+Input: nums = [-10,8,6,7,-2,-3]
+Output: -1
+Explanation: There is no a single valid k, we return -1.
+```
 
 ## 结语
 

leetcode/2401-2500/2441.Largest-Positive-Integer-That-Exists-With-Its-Negative/Solution.go

@@ -1,5 +1,17 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(nums []int) int {
+	e := make(map[int]struct{})
+	ans := -1
+	for _, n := range nums {
+		if _, ok := e[-n]; ok {
+			if n < 0 {
+				n = -n
+			}
+			ans = max(ans, n)
+			continue
+		}
+		e[n] = struct{}{}
+	}
+	return ans
 }

leetcode/2401-2500/2441.Largest-Positive-Integer-That-Exists-With-Its-Negative/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, 3}, 3},
+		{"TestCase2", []int{-1, 10, 6, 7, -7, 1}, 7},
+		{"TestCase3", []int{-10, 8, 6, 7, -2, -3}, -1},
 	}
 
 	//	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() {
 }