Add solution #1357

Author: JoshCrozier

README.md

@@ -1,4 +1,4 @@
-# 1,252 LeetCode solutions in JavaScript
+# 1,253 LeetCode solutions in JavaScript
 
 [https://leetcodejavascript.com](https://leetcodejavascript.com)
 
@@ -1031,6 +1031,7 @@
 1353|[Maximum Number of Events That Can Be Attended](./solutions/1353-maximum-number-of-events-that-can-be-attended.js)|Medium|
 1354|[Construct Target Array With Multiple Sums](./solutions/1354-construct-target-array-with-multiple-sums.js)|Hard|
 1356|[Sort Integers by The Number of 1 Bits](./solutions/1356-sort-integers-by-the-number-of-1-bits.js)|Easy|
+1357|[Apply Discount Every n Orders](./solutions/1357-apply-discount-every-n-orders.js)|Medium|
 1358|[Number of Substrings Containing All Three Characters](./solutions/1358-number-of-substrings-containing-all-three-characters.js)|Medium|
 1360|[Number of Days Between Two Dates](./solutions/1360-number-of-days-between-two-dates.js)|Easy|
 1365|[How Many Numbers Are Smaller Than the Current Number](./solutions/1365-how-many-numbers-are-smaller-than-the-current-number.js)|Easy|

solutions/1357-apply-discount-every-n-orders.js

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+/**
+ * 1357. Apply Discount Every n Orders
+ * https://leetcode.com/problems/apply-discount-every-n-orders/
+ * Difficulty: Medium
+ *
+ * There is a supermarket that is frequented by many customers. The products sold at the supermarket
+ * are represented as two parallel integer arrays products and prices, where the ith product has an
+ * ID of products[i] and a price of prices[i].
+ *
+ * When a customer is paying, their bill is represented as two parallel integer arrays product and
+ * amount, where the jth product they purchased has an ID of product[j], and amount[j] is how much
+ * of the product they bought. Their subtotal is calculated as the sum of each amount[j] * (price
+ * of the jth product).
+ *
+ * The supermarket decided to have a sale. Every nth customer paying for their groceries will be
+ * given a percentage discount. The discount amount is given by discount, where they will be given
+ * discount percent off their subtotal. More formally, if their subtotal is bill, then they would
+ * actually pay bill * ((100 - discount) / 100).
+ *
+ * Implement the Cashier class:
+ * - Cashier(int n, int discount, int[] products, int[] prices) Initializes the object with n,
+ *   the discount, and the products and their prices.
+ * - double getBill(int[] product, int[] amount) Returns the final total of the bill with the
+ *   discount applied (if any). Answers within 10-5 of the actual value will be accepted.
+ */
+
+/**
+ * @param {number} n
+ * @param {number} discount
+ * @param {number[]} products
+ * @param {number[]} prices
+ */
+var Cashier = function(n, discount, products, prices) {
+  this.customerCount = 0;
+  this.discountPercent = discount;
+  this.nthCustomer = n;
+  this.priceMap = new Map();
+  for (let i = 0; i < products.length; i++) {
+    this.priceMap.set(products[i], prices[i]);
+  }
+};
+
+/**
+ * @param {number[]} product
+ * @param {number[]} amount
+ * @return {number}
+ */
+Cashier.prototype.getBill = function(product, amount) {
+  this.customerCount++;
+  let total = 0;
+  for (let i = 0; i < product.length; i++) {
+    total += this.priceMap.get(product[i]) * amount[i];
+  }
+  if (this.customerCount % this.nthCustomer === 0) {
+    return total * (100 - this.discountPercent) / 100;
+  }
+  return total;
+};