From 116240cf06b3d92895e539d6743cad790a714134 Mon Sep 17 00:00:00 2001
From: Hidemichi Shimura <hidemichi.shimura@gmail.com>
Date: Fri, 6 Jan 2023 23:58:09 -0800
Subject: [PATCH 1/3] solve 2441. Largest Positive Integer That Exists With Its
 Negative

---
 ...e-integer-that-exists-with-its-negative.js | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 2441.largest-positive-integer-that-exists-with-its-negative.js

diff --git a/2441.largest-positive-integer-that-exists-with-its-negative.js b/2441.largest-positive-integer-that-exists-with-its-negative.js
new file mode 100644
index 00000000..eccc3f20
--- /dev/null
+++ b/2441.largest-positive-integer-that-exists-with-its-negative.js
@@ -0,0 +1,19 @@
+/* URL of this problem
+ * https://leetcode.com/problems/largest-positive-integer-that-exists-with-its-negative/description/
+ *
+ * @param {number[]} nums
+ * @return {number}
+ */
+
+var findMaxK = function(nums) {
+    const Sorted = [...nums].sort((a, b) => b - a);
+
+    for (let i = 0; i < Sorted.length; i++) {
+        if (Sorted.includes(-1 * Sorted[i])) {
+            return Sorted[i];
+        }
+    }
+    return -1;
+};
+
+module.exports = findMaxK;
\ No newline at end of file

From 63dfc61fc4e01b2c494cb26c9586da3c7cc2a0fc Mon Sep 17 00:00:00 2001
From: Hidemichi Shimura <hidemichi.shimura@gmail.com>
Date: Sat, 7 Jan 2023 15:53:52 -0800
Subject: [PATCH 2/3] test function findMaxK

---
 findMaxK.test.js | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
 create mode 100644 findMaxK.test.js

diff --git a/findMaxK.test.js b/findMaxK.test.js
new file mode 100644
index 00000000..4484b18c
--- /dev/null
+++ b/findMaxK.test.js
@@ -0,0 +1,17 @@
+const findMaxK = require("./2441.largest-positive-integer-that-exists-with-its-negative");
+
+test("Return the largest positive integer k such that -k also exists in the array", () => {
+    expect(findMaxK([-1,2,-3,3])).toBe(3);
+});
+
+test("Return -1 if there is no such a positive integer k that -k also exists in the array", () => {
+    expect(findMaxK([-10,8,6,7,-2,-3])).toBe(-1);
+});
+
+test("Return Infinity if the array contains Infinity and -Infinity", () => {
+    expect(findMaxK([Infinity, -Infinity])).toBe(Infinity);
+});
+
+test("Return 0 if the array contains only zeroes", () => {
+    expect(findMaxK([0,0])).toBe(0);
+});
\ No newline at end of file

From f1c9d178784899c0e72d4b2e99aa48a5e32b4cdd Mon Sep 17 00:00:00 2001
From: Hidemichi Shimura <hidemichi.shimura@gmail.com>
Date: Sat, 7 Jan 2023 15:58:14 -0800
Subject: [PATCH 3/3] add a comment and fix some code

---
 ...rgest-positive-integer-that-exists-with-its-negative.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/2441.largest-positive-integer-that-exists-with-its-negative.js b/2441.largest-positive-integer-that-exists-with-its-negative.js
index eccc3f20..543aa871 100644
--- a/2441.largest-positive-integer-that-exists-with-its-negative.js
+++ b/2441.largest-positive-integer-that-exists-with-its-negative.js
@@ -6,11 +6,14 @@
  */
 
 var findMaxK = function(nums) {
+    // Sort the input nums in a descending order
     const Sorted = [...nums].sort((a, b) => b - a);
 
     for (let i = 0; i < Sorted.length; i++) {
-        if (Sorted.includes(-1 * Sorted[i])) {
-            return Sorted[i];
+        const Num = Sorted[i];
+
+        if (Sorted.includes(Num * -1)) {
+            return Num;
         }
     }
     return -1;