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American Express LeetCode Questions 2026

Browse LeetCode problems frequently asked by American Express. Filter by difficulty and timeframe to focus your interview prep.

Last updated: 20 Feb 2026

ProblemDifficultyFrequencyTopics
Two SumEASY
87.5%
ArrayHash Table
3SumMEDIUM
62.5%
ArrayTwo PointersSorting
Trapping Rain WaterHARD
50%
ArrayTwo PointersDynamic ProgrammingStackMonotonic Stack
Find a Value of a Mysterious Function Closest to TargetHARD
100%
ArrayBinary SearchBit ManipulationSegment Tree
Valid PalindromeEASY
62.5%
Two PointersString
Divide an Array Into Subarrays With Minimum Cost IIHARD
100%
ArrayHash TableSliding WindowHeap (Priority Queue)
Divide an Array Into Subarrays With Minimum Cost IEASY
100%
ArraySortingEnumeration
Minimum Deletions to Make Character Frequencies UniqueMEDIUM
100%
Hash TableStringGreedySorting
Ugly Number IIIMEDIUM
100%
MathBinary SearchCombinatoricsNumber Theory
Percentage of Letter in StringEASY
100%
String
Maximum Equal FrequencyHARD
100%
ArrayHash Table
Maximize the Topmost Element After K MovesMEDIUM
100%
ArrayGreedy
Maximum XOR After OperationsMEDIUM
100%
ArrayMathBit Manipulation
Equal Sum Arrays With Minimum Number of OperationsMEDIUM
100%
ArrayHash TableGreedyCounting
Minimum Number of Operations to Make Array XOR Equal to KMEDIUM
100%
ArrayBit Manipulation
Valid AnagramEASY
62.5%
Hash TableStringSorting
Longest Substring Without Repeating CharactersMEDIUM
62.5%
Hash TableStringSliding Window
Rotate ArrayMEDIUM
50%
ArrayMathTwo Pointers
PermutationsMEDIUM
50%
ArrayBacktracking
Best Time to Buy and Sell StockEASY
62.5%
ArrayDynamic Programming

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