Deloitte LeetCode Questions

43 questions all-time · 17 easy · 23 medium · 3 hard

#	Problem	Difficulty	Frequency	Acceptance
1	Merge k Sorted Lists Linked List, Divide and Conquer, Heap (Priority Queue), Merge Sort	Hard	100	0.6%
2	Two Sum Array, Hash Table	Easy	96	0.6%
3	Change Null Values in a Table to the Previous Value Database	Medium	85	0.5%
4	Valid Parentheses String, Stack	Easy	77	0.4%
5	Second Highest Salary Database	Medium	77	0.5%
6	Best Time to Buy and Sell Stock Array, Dynamic Programming	Easy	74	0.6%
7	Longest Palindromic Substring Two Pointers, String, Dynamic Programming	Medium	74	0.4%
8	Longest Substring Without Repeating Characters Hash Table, String, Sliding Window	Medium	74	0.4%
9	Palindrome Number Math	Easy	65	0.6%
10	Longest Common Prefix Array, String, Trie	Easy	65	0.5%
11	Container With Most Water Array, Two Pointers, Greedy	Medium	65	0.6%
12	Managers with at Least 5 Direct Reports Database	Medium	58	0.5%
13	Minimum Time to Repair Cars Array, Binary Search	Medium	58	0.6%
14	Merge Intervals Array, Sorting	Medium	58	0.5%
15	Maximum Subarray Array, Divide and Conquer, Dynamic Programming	Medium	58	0.5%
16	First Unique Character in a String Hash Table, String, Queue, Counting	Easy	58	0.7%
17	Nth Highest Salary Database	Medium	58	0.4%
18	Group Anagrams Array, Hash Table, String, Sorting	Medium	58	0.7%
19	3Sum Array, Two Pointers, Sorting	Medium	58	0.4%
20	Remove Duplicates from Sorted Array Array, Two Pointers	Easy	58	0.6%
21	Add Binary Math, String, Bit Manipulation, Simulation	Easy	58	0.6%
22	Climbing Stairs Math, Dynamic Programming, Memoization	Easy	58	0.5%
23	Valid Palindrome Two Pointers, String	Easy	58	0.5%
24	Edit Distance String, Dynamic Programming	Medium	49	0.6%
25	Coin Change Array, Dynamic Programming, Breadth-First Search	Medium	49	0.5%
26	Rising Temperature Database	Easy	49	0.5%
27	Max Consecutive Ones Array	Easy	49	0.7%
28	Kth Largest Element in an Array Array, Divide and Conquer, Sorting, Heap (Priority Queue), Quickselect	Medium	49	0.7%
29	Customers Who Never Order Database	Easy	49	0.7%
30	Roman to Integer Hash Table, Math, String	Easy	49	0.7%
31	Reverse Pairs Array, Binary Search, Divide and Conquer, Binary Indexed Tree, Segment Tree, Merge Sort, Ordered Set	Hard	49	0.3%
32	Longest Consecutive Sequence Array, Hash Table, Union-Find	Medium	49	0.5%
33	Remove K-Balanced Substrings String, Stack, Simulation	Medium	49	0.3%
34	Split Array Largest Sum Array, Binary Search, Dynamic Programming, Greedy, Prefix Sum	Hard	49	0.6%
35	Shortest Unsorted Continuous Subarray Array, Two Pointers, Stack, Greedy, Sorting, Monotonic Stack	Medium	49	0.4%
36	Rotate Array Array, Math, Two Pointers	Medium	49	0.5%
37	Valid Anagram Hash Table, String, Sorting	Easy	49	0.7%
38	Remove K Digits String, Stack, Greedy, Monotonic Stack	Medium	49	0.4%
39	Remove All Adjacent Duplicates In String String, Stack	Easy	49	0.7%
40	Subarray Sum Equals K Array, Hash Table, Prefix Sum	Medium	49	0.5%
41	Next Permutation Array, Two Pointers	Medium	49	0.5%
42	Reverse Vowels of a String Two Pointers, String	Easy	49	0.6%
43	Super Ugly Number Array, Math, Dynamic Programming	Medium	49	0.5%

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.