How to Solve Coupon Code Validator Problem
Master the Coupon Code Validator LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
Interview Coder generates complete solutions and debugging hints that you can use while explaining your approach, so you stay calm and in control.
Coupon Code Validator
You are given three arrays of length n that describe the properties of n coupons: code, businessLine, and isActive. The ith coupon has: code[i]: a string representing the coupon identifier. businessLi...
Interview Coder will help you solve this problem in real-time during your interview
✨ Get instant solutions, explanations, and code generation
Understanding the Coupon Code Validator Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given three arrays of length n that describe the properties of n coupons: code, businessLine, and isActive. The ith coupon has: code[i]: a string representing the coupon identifier. businessLine[i]: a string denoting the business category of the coupon. isActive[i]: a boolean indicating whether the coupon is currently active. A coupon is considered valid if all of the following conditions hold: code[i] is non-empty and consists only of alphanumeric characters (a-z, A-Z, 0-9) and underscores (_). businessLine[i] is one of the following four categories: "electronics", "grocery", "pharmacy", "restaurant". isActive[i] is true. Return an array of the codes of all valid coupons, sorted first by their businessLine in the order: "electronics", "grocery", "pharmacy", "restaurant", and then by code in lexicographical (ascending) order within each category.
Coupon Code Validator
Related Topics
How Interview Coder Helps
Get real-time assistance for Coupon Code Validator problems during coding interviews. Interview Coder provides instant solutions and explanations.
Examples
code = ["SAVE20","","PHARMA5","SAVE@20"], businessLine = ["restaurant","grocery","pharmacy","restaurant"], isActive = [true,true,true,true]["PHARMA5","SAVE20"]First coupon is valid. Second coupon has empty code (invalid). Third coupon is valid. Fourth coupon has special character @ (invalid).
code = ["GROCERY15","ELECTRONICS_50","DISCOUNT10"], businessLine = ["grocery","electronics","invalid"], isActive = [false,true,true]["ELECTRONICS_50"]First coupon is inactive (invalid). Second coupon is valid. Third coupon has invalid business line (invalid).
Constraints
n == code.length == businessLine.length == isActive.length1 <= n <= 1000 <= code[i].length, businessLine[i].length <= 100code[i] and businessLine[i] consist of printable ASCII characters.isActive[i] is either true or false.How Interview Coder Helps with Leetcode Problems
Trust anchors reduce friction for conversion. Reinforce undetectability claims, platform compatibility, user counts, and the free trial to remove perceived risk.
See Interview Coder in Action
Watch how Interview Coder helps solve LeetCode problems during live interviews
Undetectability Checklist
Platform Compatibility
User results and traction
More than 87,000 developers use Interview Coder and early launch metrics showed rapid adoption. Social proof signals that this approach helps real candidates land offers across a range of companies.
Undetectability and technical details
Our native desktop architecture avoids common detection vectors used by browser extensions. We provide a clear checklist so you can run basic checks and confirm the app will be invisible during live interviews.
Platform compatibility and limitations
We work with Zoom, HackerRank, CodeSignal, CoderPad and other web based platforms, with a known list of app version caveats. Check the compatibility note and request a browser link if a specific desktop app is unsupported.
Frequently Asked Questions
Common questions about solving Coupon Code Validator and using Interview Coder during coding interviews.
Interview Coder generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.
Ready to Get Started?
Download Interview Coder now and join thousands of developers who have aced their coding interviews