ServiceNow LeetCode Interview Questions

71 questions all-time · 7 easy · 51 medium · 13 hard

ServiceNow has asked 71 distinct LeetCode questions across all recorded interviews: 7 easy, 51 medium and 13 hard. The questions reported most often are LRU Cache, Longest Substring Without Repeating Characters and Lexicographically Smallest String After Operations With Constraint. 67 of them were reported in interviews from the 6+ Months Ago window. Every question links straight to LeetCode, and the list can be filtered by difficulty and topic or sorted by how often the question comes up.

#	Problem	Difficulty	Frequency	Acceptance
1	LRU Cache	Medium	100	0.5%
2	Longest Substring Without Repeating Characters	Medium	95	0.4%
3	Lexicographically Smallest String After Operations With Constraint	Medium	95	0.6%
4	Number of Distinct Roll Sequences	Hard	95	0.6%
5	Find Minimum Diameter After Merging Two Trees	Hard	95	0.6%
6	Trapping Rain Water	Hard	89	0.7%
7	Maximum Score with Co-Prime Element	Hard	89	0.3%
8	Number of Islands	Medium	86	0.6%
9	Generate Parentheses	Medium	82	0.8%
10	String Compression	Medium	82	0.6%
11	Valid Parentheses	Easy	77	0.4%
12	Longest Repeating Character Replacement	Medium	77	0.6%
13	Container With Most Water	Medium	71	0.6%
14	First Missing Positive	Hard	71	0.4%
15	Asteroid Collision	Medium	71	0.5%
16	Sliding Window Maximum	Hard	71	0.5%
17	Pacific Atlantic Water Flow	Medium	71	0.6%
18	Best Time to Buy and Sell Stock II	Medium	71	0.7%
19	Two Sum	Easy	63	0.6%
20	Longest Palindromic Substring	Medium	63	0.4%
21	Group Anagrams	Medium	63	0.7%
22	Maximum Subarray	Medium	63	0.5%
23	Best Time to Buy and Sell Stock	Easy	63	0.6%
24	Kth Largest Element in an Array	Medium	63	0.7%
25	Move Zeroes	Easy	63	0.6%
26	Number of Visible People in a Queue	Hard	63	0.7%
27	Coin Change	Medium	63	0.5%
28	Rotting Oranges	Medium	63	0.6%
29	Reverse Words in a String II	Medium	63	0.6%
30	LFU Cache	Hard	63	0.5%
31	Set Matrix Zeroes	Medium	63	0.6%
32	Check if a Parentheses String Can Be Valid	Medium	63	0.5%
33	Minimum Number of Swaps to Make the String Balanced	Medium	63	0.8%
34	Jump Game II	Medium	63	0.4%
35	Merge Two Sorted Lists	Easy	63	0.7%
36	Median of Two Sorted Arrays	Hard	53	0.5%
37	Zigzag Conversion	Medium	53	0.5%
38	Merge Intervals	Medium	53	0.5%
39	Vowels of All Substrings	Medium	53	0.6%
40	Maximum Product Subarray	Medium	53	0.4%
41	Largest Number	Medium	53	0.4%
42	Reverse Linked List	Easy	53	0.8%
43	Daily Temperatures	Medium	53	0.7%
44	Minimum One Bit Operations to Make Integers Zero	Hard	53	0.8%
45	Pow(x, n)	Medium	53	0.4%
46	Amount of Time for Binary Tree to Be Infected	Medium	53	0.7%
47	Time Needed to Rearrange a Binary String	Medium	53	0.5%
48	Binary Tree Right Side View	Medium	53	0.7%
49	Letter Combinations of a Phone Number	Medium	53	0.7%
50	Palindrome Linked List	Easy	53	0.6%
51	4Sum	Medium	53	0.4%
52	Number of Distinct Islands	Medium	53	0.6%
53	Next Permutation	Medium	53	0.5%
54	Gas Station	Medium	53	0.5%
55	Find Peak Element	Medium	53	0.5%
56	Target Sum	Medium	53	0.5%
57	Single Element in a Sorted Array	Medium	53	0.6%
58	Top K Frequent Elements	Medium	53	0.7%
59	Subarrays with K Different Integers	Hard	53	0.7%
60	House Robber II	Medium	53	0.5%
61	Maximum Profit From Trading Stocks	Medium	53	0.5%
62	Subarray Sum Equals K	Medium	53	0.5%
63	Next Greater Element II	Medium	53	0.7%
64	Word Ladder	Hard	53	0.5%
65	Simplify Path	Medium	53	0.5%
66	Fruit Into Baskets	Medium	53	0.5%
67	Longest Common Subsequence	Medium	53	0.6%
68	Combination Sum	Medium	53	0.8%
69	Critical Connections in a Network	Hard	53	0.6%
70	Reverse Words in a String	Medium	53	0.6%
71	Sort Colors	Medium	53	0.7%

Where this data comes from

These questions come from the public leetcode-company-wise-problems data set, which collects interview reports from candidates. They are community-reported rather than published by ServiceNow, so treat the list as a strong signal of what gets asked, not an official or exhaustive syllabus. Last refreshed 2026-08-08.

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. It is a relative popularity signal within ServiceNow's questions, not a probability that you will be asked it. Acceptance is LeetCode's own share of submissions that pass for that problem, across all users, not something specific to ServiceNow. Click any question to open it on LeetCode.

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