Coupon Code Validator | LeetCode 3606 🔥 | Daily Coding Challenge | Optimal Approach

In this video, we solve LeetCode 3606 – Coupon Code Validator (Daily Coding Challenge). Code: (If it helped, Please upvote guys) https://leetcode.com/problems/coupon-code-validator/solutions/7409910/simple-intuitive-solution-sorting-map-co-h9k5 Graph for Placemenets: https://youtube.com/playlist?list=PLsLlEdtakGox1mdnH0PrJUhHJByUstkvx&si=G9RI1CoVaiWk3rGC Linked List: https://youtube.com/playlist?list=PLsLlEdtakGowLdcT3ocFdt5MCEuTYVOzF&si=C3BCXmtgWukMILJ9 Arrays: https://youtube.com/playlist?list=PLsLlEdtakGowZJCHMEdcAu7dR3_hYpi3S&si=_l6rImAoE7Vm4QRD Leetcode Contests: https://youtube.com/playlist?list=PLsLlEdtakGoxoGbAwVRSlRjuB1yv1ycnc&feature=shared Neetcode 150 Playlist: https://youtube.com/playlist?list=PLsLlEdtakGozrvhxZsPfvXavXYzX2GUig&feature=shared SDE Sheet for Interview: https://youtube.com/playlist?list=PLsLlEdtakGozEsXcEpJPihiod1MwHf3M1&feature=shared DP Playlist: https://youtube.com/playlist?list=PLsLlEdtakGoyNROP7uWS9OLLHs9_JluVM&feature=shared Sliding window Playlist: https://youtube.com/playlist?list=PLsLlEdtakGozlKx_L-5PQJO-ua_maQb6R&feature=shared Binary Search Playlist: https://youtube.com/playlist?list=PLsLlEdtakGozNxx5rfRgEW-1DYseLnDbV&feature=shared You are given coupon codes with their business category and active status. We validate coupons based on given rules and return all valid coupon codes, sorted first by business line priority and then lexicographically within each category. 🔗 Problem Link: https://leetcode.com/problems/coupon-code-validator/ Approach Use a HashMap to assign priority to each business line Validate each coupon based on: active status valid category valid code format Store valid coupons and sort using custom comparator Return only coupon codes in required order Time Complexity: O(n log n) Space Complexity: O(n) #leetcode #leetcode3606 #dailycodingchallenge #dcc #dsa #javacode #coding #competitiveprogramming #interviewprep