From 00081154b28fbad90b6d4568cce73fc249cd1629 Mon Sep 17 00:00:00 2001
From: Hidemichi Shimura <hidemichi.shimura@gmail.com>
Date: Thu, 12 Jan 2023 10:59:31 -0800
Subject: [PATCH 1/2] solve 2144. Minimum Cost of Buying Candies With Discount

---
 ...um-cost-of-buying-candies-with-discount.js | 26 +++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 2144.minimum-cost-of-buying-candies-with-discount.js

diff --git a/2144.minimum-cost-of-buying-candies-with-discount.js b/2144.minimum-cost-of-buying-candies-with-discount.js
new file mode 100644
index 00000000..23bf8532
--- /dev/null
+++ b/2144.minimum-cost-of-buying-candies-with-discount.js
@@ -0,0 +1,26 @@
+/* URL of this problem
+ * https://leetcode.com/problems/minimum-cost-of-buying-candies-with-discount/description/
+ *
+ * @param {number[]} cost
+ * @return {number}
+ */
+
+var minimumCost = function(cost) {
+    // Create a copy of cost sorted in a descendign order
+    const SortedCost = [...cost].sort((a, b) => b - a);
+    let MinCost = 0;
+
+    while (SortedCost.length > 0) {
+        // Extract the current top 3 costs and add only the top 2 to MinCost
+        // The thrid cost becomes free by not being added to MinCost 
+        const Candies = SortedCost.splice(0, 3);
+        const FirstCandie = Candies[0] ?? 0;
+        const SecondCandie = Candies[1] ?? 0; 
+
+        MinCost += FirstCandie + SecondCandie;
+    }
+
+    return MinCost;
+};
+
+module.exports = minimumCost;
\ No newline at end of file

From 0113b36f001796ef3986e5697d762849a8d9f791 Mon Sep 17 00:00:00 2001
From: Hidemichi Shimura <hidemichi.shimura@gmail.com>
Date: Thu, 12 Jan 2023 11:00:03 -0800
Subject: [PATCH 2/2] test function minimumCost

---
 minimumCost.test.js | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 minimumCost.test.js

diff --git a/minimumCost.test.js b/minimumCost.test.js
new file mode 100644
index 00000000..7aa09b49
--- /dev/null
+++ b/minimumCost.test.js
@@ -0,0 +1,29 @@
+const minimumCost = require("../jest-test/2144. minimum-cost-of-buying-candies-with-discount");
+
+test("Return the minimum cost of buying all the candies", () => {
+    expect(minimumCost([6,5,7,9,2,2])).toBe(23);
+});
+
+test("Return the sum of the element values if the input cost has only 2 elements", () => {
+    expect(minimumCost([1,2])).toBe(3);
+});
+
+test("Return the element value if the input cost has only 1 element", () => {
+    expect(minimumCost([1])).toBe(1);
+});
+
+test("Return 0 if the input cost has no element", () => {
+    expect(minimumCost([])).toBe(0);
+});
+
+test("Return Infinity if the input cost has Infinity", () => {
+    expect(minimumCost([6,5,7,9,2,2,Infinity])).toBe(Infinity);
+});
+
+test("Return -Infinity if the input cost has -Infinity and it does not become free for a third candy", () => {
+    expect(minimumCost([6,5,7,9,2,2,-Infinity])).toBe(-Infinity);
+});
+
+test("Return -Infinity if the input cost has -Infinity but it becomes free for a third candy", () => {
+    expect(minimumCost([6,5,7,9,2,-Infinity])).toBe(23);
+});
\ No newline at end of file