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 10 problems of 26
- #14mediumfoundational
14. Add Two Numbers
Add two numbers stored as reverse-order linked lists, mirroring how Coupang's order-totalization pipeline streams partial sums across digit-precision boundaries during peak-event throughput.
- #15mediumfoundational
15. Longest Substring Without Repeating Characters
Find the longest substring without repeats, mirroring how Coupang's Korean e-commerce search ranking computes max-distinct windows over user query history.
- #16mediumfoundational
16. 3Sum
Find all unique triplets that sum to zero, mirroring how Coupang's bundle-pricing engine identifies SKU combinations that hit a target promotional discount during peak-event throughput.
- #17mediumfoundational
17. Container With Most Water
Find two lines that form the largest water container, mirroring how Coupang's truck-loading planner picks the pair of pallet heights that maximize same-day delivery routing volume.
- #18mediumfoundational
18. Group Anagrams
Group strings that are anagrams of each other, mirroring how Coupang's Korean e-commerce search ranking clusters tokens that normalize to the same canonical form for retrieval.
- #19mediumfoundational
19. Product of Array Except Self
Compute the product of all elements except each index without division, mirroring how Coupang's recommendation system computes per-SKU lift signals while excluding the current item from the cohort.
- #20mediumfoundational
20. Search in Rotated Sorted Array
Find a target in a rotated sorted array in O(log n), mirroring how Coupang's same-day delivery routing locates a slot in a partially rotated time-window index after midnight pivot.
- #21mediumfoundational
21. Coin Change
Compute the fewest coins to make an amount, mirroring how Coupang's checkout engine selects the minimum-count promotion stack to reach a target Korean e-commerce search ranking discount.
- #22mediumfoundational
22. Word Break
Decide whether a string can be segmented into dictionary words, mirroring how Coupang's Korean e-commerce search ranking segments user queries against an in-memory product-name lexicon.
- #23mediumfoundational
23. Number of Islands
Count connected land regions in a grid, mirroring how Coupang's same-day delivery routing partitions warehouses into connected coverage zones from a 2D capacity map.