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Coupang LeetCode Questions

49 questions all-time · 2 easy · 33 medium · 14 hard
# Problem Difficulty Frequency Acceptance
1Subsets
Array, Backtracking, Bit Manipulation
Medium
100
80.9%
2Word Break
Array, Hash Table, String, Dynamic Programming, Trie, Memoization
Medium
100
48.3%
3Decode String
String, Stack, Recursion
Medium
98
61.2%
4Longest Substring with At Most K Distinct Characters
Hash Table, String, Sliding Window
Medium
96
49.5%
5LFU Cache
Hash Table, Linked List, Design, Doubly-Linked List
Hard
96
46.6%
6Range Module
Design, Segment Tree, Ordered Set
Hard
93
44.2%
7Split BST
Tree, Binary Search Tree, Recursion, Binary Tree
Medium
93
82.4%
8Find Pivot Index
Array, Prefix Sum
Easy
93
60.6%
9LRU Cache
Hash Table, Linked List, Design, Doubly-Linked List
Medium
93
45.2%
10Course Schedule
Depth-First Search, Breadth-First Search, Graph, Topological Sort
Medium
91
49.2%
11Design In-Memory File System
Hash Table, String, Design, Trie, Sorting
Hard
91
48.2%
12Unique Paths II
Array, Dynamic Programming, Matrix
Medium
81
43.2%
13Design Twitter
Hash Table, Linked List, Design, Heap (Priority Queue)
Medium
81
42.7%
14Possible Bipartition
Depth-First Search, Breadth-First Search, Union Find, Graph
Medium
76
51.5%
15Shopping Offers
Array, Dynamic Programming, Backtracking, Bit Manipulation, Memoization, Bitmask
Medium
76
51.9%
16Longest Repeating Substring
String, Binary Search, Dynamic Programming, Rolling Hash, Suffix Array, Hash Function
Medium
76
63.1%
17Unique Paths
Math, Dynamic Programming, Combinatorics
Medium
76
65.8%
18Regular Expression Matching
String, Dynamic Programming, Recursion
Hard
76
29.3%
19Find K Closest Elements
Array, Two Pointers, Binary Search, Sliding Window, Sorting, Heap (Priority Queue)
Medium
70
48.7%
20Remove K Digits
String, Stack, Greedy, Monotonic Stack
Medium
70
34.9%
21Longest Substring Without Repeating Characters
Hash Table, String, Sliding Window
Medium
70
36.9%
22Shortest Bridge
Array, Depth-First Search, Breadth-First Search, Matrix
Medium
70
58.6%
23Longest Duplicate Substring
String, Binary Search, Sliding Window, Rolling Hash, Suffix Array, Hash Function
Hard
70
30.8%
24Design Hit Counter
Array, Binary Search, Design, Queue, Data Stream
Medium
63
69.2%
25Sliding Window Maximum
Array, Queue, Sliding Window, Heap (Priority Queue), Monotonic Queue
Hard
63
47.6%
26Search a 2D Matrix
Array, Binary Search, Matrix
Medium
63
52.3%
27Snapshot Array
Array, Hash Table, Binary Search, Design
Medium
63
36.7%
28Single Element in a Sorted Array
Array, Binary Search
Medium
63
59.2%
29Group Anagrams
Array, Hash Table, String, Sorting
Medium
63
70.9%
30Number of Distinct Islands
Hash Table, Depth-First Search, Breadth-First Search, Union Find, Hash Function
Medium
63
62.3%
31Basic Calculator II
Math, String, Stack
Medium
63
45.8%
32Cheapest Flights Within K Stops
Dynamic Programming, Depth-First Search, Breadth-First Search, Graph, Heap (Priority Queue), Shortest Path
Medium
63
40.4%
33Number of Islands
Array, Depth-First Search, Breadth-First Search, Union Find, Matrix
Medium
63
62.3%
34Wildcard Matching
String, Dynamic Programming, Greedy, Recursion
Hard
63
29.9%
35Distinct Subsequences
String, Dynamic Programming
Hard
53
50.1%
36Buildings With an Ocean View
Array, Stack, Monotonic Stack
Medium
53
80.8%
37Maximum Number of Tasks You Can Assign
Array, Two Pointers, Binary Search, Greedy, Queue, Sorting, Monotonic Queue
Hard
53
50.6%
38Reorganize String
Hash Table, String, Greedy, Sorting, Heap (Priority Queue), Counting
Medium
53
56.2%
39Kth Largest Element in an Array
Array, Divide and Conquer, Sorting, Heap (Priority Queue), Quickselect
Medium
53
68.0%
40Bus Routes
Array, Hash Table, Breadth-First Search
Hard
53
47.0%
41Split Strings by Separator
Array, String
Easy
53
74.9%
42Number of Atoms
Hash Table, String, Stack, Sorting
Hard
53
65.0%
43Find Median from Data Stream
Two Pointers, Design, Sorting, Heap (Priority Queue), Data Stream
Hard
53
53.3%
44Open the Lock
Array, Hash Table, String, Breadth-First Search
Medium
53
60.7%
45Pacific Atlantic Water Flow
Array, Depth-First Search, Breadth-First Search, Matrix
Medium
53
57.5%
46Search a 2D Matrix II
Array, Binary Search, Divide and Conquer, Matrix
Medium
53
55.2%
47Basic Calculator III
Math, String, Stack, Recursion
Hard
53
52.5%
48Increasing Triplet Subsequence
Array, Greedy
Medium
53
39.1%
49Basic Calculator
Math, String, Stack, Recursion
Hard
53
45.6%

How to read this list

The tabs at the top split the questions by how recently people said they were asked in interviews. "Last 30 Days" is the past month, "Last 3 Months" is the past quarter, and so on. "All Time" is every question on record for this company.

Frequency is a score from 0 to 100 for how often a question showed up in that time window. A higher number means it came up more often, so the list starts with the most common questions first. Acceptance is the share of submissions that pass on LeetCode. Click any question to open it on LeetCode.