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American-express Master DSA Sheet

This compilation contains exclusive, previously asked data structure and algorithm questions from real American-express interviews. Focus on these core problem patterns to confidently tackle even the hardest interview challenges.

top-specificamerican-express-prep
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Maximum Equal Frequency
Hard
Maximum XOR After Operations
Medium
Divide an Array Into Subarrays With Minimum Cost II
Hard
Find a Value of a Mysterious Function Closest to Target
Hard
Percentage of Letter in String
Easy
Equal Sum Arrays With Minimum Number of Operations
Medium
Maximize the Topmost Element After K Moves
Medium
Longest Substring Without Repeating Characters
Medium
Minimum Deletions to Make Character Frequencies Unique
Medium
Trapping Rain Water
Hard
Two Sum
Easy
Longest Common Prefix
Easy
Linked List Cycle II
Medium
Permutations
Medium
Isomorphic Strings
Easy
Rotate Array
Medium
Best Time to Buy and Sell Stock
Easy
3Sum
Medium
Valid Anagram
Easy
Valid Palindrome
Easy
Find N Unique Integers Sum up to Zero6 Months
Easy
Ugly Number III
Medium
Minimum Number of Operations to Make Array XOR Equal to K
Medium
Divide an Array Into Subarrays With Minimum Cost I
Easy