Coupang Coding Interview Questions
26 Coupang coding interview problems with full optimal solutions — 13 easy, 10 medium, 3 hard. Every problem ships with multiple approaches (brute-force first, then the optimal), complexity tables for each, company-specific tips on what an Coupang interviewer values, and a FAQ section.
Showing 13 problems of 26
- #1easyfoundational
1. Two Sum
Find two indices in an array whose values sum to a target — Coupang uses this as a warm-up to test hash-map fluency before pivoting to inventory pricing problems.
- #2easyfoundational
2. Valid Parentheses
Validate a string of brackets using a stack — Coupang asks this to gauge stack reasoning before search-query parsing rounds.
- #3easyfoundational
3. Merge Two Sorted Lists
Merge two sorted linked lists into one sorted list — Coupang uses it to test pointer hygiene before merging delivery-route streams.
- #4easyfoundational
4. Remove Duplicates from Sorted Array
In-place dedupe of a sorted array — Coupang asks this to test pointer-pair fluency before SKU-list deduplication problems.
- #5easyfoundational
5. Remove Element
Remove all occurrences of a value in-place — Coupang uses this as a warm-up to test pointer logic before stock-clear list problems.
- #6easyfoundational
6. Search Insert Position
Binary-search for an insert index — Coupang uses this to test binary-search instincts that show up later in price-range filter problems.
- #7easyfoundational
7. Plus One
Increment a big integer represented as a digits array — Coupang uses this to check carry-propagation logic before order-number generator problems.
- #8easyfoundational
8. Merge Sorted Array
Merge two sorted arrays in-place, mirroring how Coupang merges sorted delivery slot batches for same-day routing.
- #9easyfoundational
9. Best Time to Buy and Sell Stock
Find the max profit from one buy-sell pair, mirroring how Coupang detects best price gaps in fluctuating SKU pricing for peak-event throughput.
- #10easyfoundational
10. Contains Duplicate
Detect whether any value appears twice in an array, mirroring how Coupang's returns-processing pipeline deduplicates RMA submissions.
- #11easyfoundational
11. Valid Anagram
Decide whether two strings are anagrams, mirroring how Coupang's Korean e-commerce search ranking normalizes query tokens.
- #12easyfoundational
12. Majority Element
Find the element that appears more than n/2 times, mirroring how Coupang's same-day delivery routing identifies the dominant origin warehouse per zone.
- #13easyfoundational
13. Move Zeroes
Move all zeroes to the end of an array while preserving the order of non-zeros, mirroring how Coupang's returns processing pushes invalidated SKUs to a quarantine tail without rewriting the active inventory.