American Express LeetCode Questions

23 questions all-time · 8 easy · 12 medium · 3 hard

#	Problem	Difficulty	Frequency	Acceptance
1	Minimum Deletions to Make Character Frequencies Unique	Medium	100	0.6%
2	Divide an Array Into Subarrays With Minimum Cost II	Hard	98	0.5%
3	Maximum Equal Frequency	Hard	98	0.4%
4	Find a Value of a Mysterious Function Closest to Target	Hard	96	0.5%
5	Divide an Array Into Subarrays With Minimum Cost I	Easy	96	0.8%
6	Ugly Number III	Medium	96	0.3%
7	Percentage of Letter in String	Easy	96	0.8%
8	Maximize the Topmost Element After K Moves	Medium	96	0.2%
9	Maximum XOR After Operations	Medium	96	0.8%
10	Equal Sum Arrays With Minimum Number of Operations	Medium	96	0.5%
11	Minimum Number of Operations to Make Array XOR Equal to K	Medium	96	0.9%
12	Two Sum	Easy	83	0.6%
13	Valid Anagram	Easy	78	0.7%
14	Longest Substring Without Repeating Characters	Medium	73	0.4%
15	Best Time to Buy and Sell Stock	Easy	66	0.6%
16	Find N Unique Integers Sum up to Zero	Easy	66	0.8%
17	3Sum	Medium	56	0.4%
18	Rotate Array	Medium	56	0.5%
19	Permutations	Medium	56	0.8%
20	Isomorphic Strings	Easy	56	0.5%
21	Longest Common Prefix	Easy	56	0.5%
22	Linked List Cycle II	Medium	56	0.6%
23	Consecutive Numbers	Medium	56	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.

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