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How to Solve Apply Discount Every n Orders Problem
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Start Free for WindowsMedium#1357
LeetCode ProblemApply Discount Every n Orders
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:
ArrayHash TableDesign
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Problem Breakdown
Understanding the Apply Discount Every n Orders Problem
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Problem Statement
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:
MediumProblem #1357
LeetCodeApply Discount Every n Orders
Related Topics
ArrayHash TableDesign
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Examples
# Example 1
Input
—
Output
—
Constraints
1 <= n <= 104
0 <= discount <= 100
1 <= products.length <= 200
prices.length == products.length
1 <= products[i] <= 200
1 <= prices[i] <= 1000
The elements in products are unique.
1 <= product.length <= products.length
amount.length == product.length
product[j] exists in products.
1 <= amount[j] <= 1000
The elements of product are unique.
At most 1000 calls will be made to getBill.
Answers within 10-5 of the actual value will be accepted.
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Solve Apply Discount Every n Orders — There is a supermarket that is frequented by many customers. The products sold a...
Here's the optimal approach using Array:
def solve(input):
# Optimal O(n) solution
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Time: O(n) | Space: O(n)
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Frequently Asked Questions
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Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
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The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
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