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American Express Problems
Master the most frequently asked interview questions for this company.
ID
Title
Difficulty
Topics
1647
Minimum Deletions to Make Character Frequencies Unique
Medium
Hash Table
String
1224
Maximum Equal Frequency
Hard
Array
Hash Table
2278
Percentage of Letter in String
Easy
String
2997
Minimum Number of Operations to Make Array XOR Equal to K
Medium
Array
Bit Manipulation
1775
Equal Sum Arrays With Minimum Number of Operations
Medium
Array
Hash Table
1521
Find a Value of a Mysterious Function Closest to Target
Hard
Array
Binary Search
2317
Maximum XOR After Operations
Medium
Array
Math
3013
Divide an Array Into Subarrays With Minimum Cost II
Hard
Array
Hash Table
3010
Divide an Array Into Subarrays With Minimum Cost I
Easy
Array
Sorting
2202
Maximize the Topmost Element After K Moves
Medium
Array
Greedy
1201
Ugly Number III
Medium
Math
Binary Search
1
Two Sum
Easy
Array
Hash Table
15
3Sum
Medium
Array
Two Pointers
242
Valid Anagram
Easy
Hash Table
String
2477
Minimum Fuel Cost to Report to the Capital
Medium
Tree
Depth-First Search
258
Add Digits
Easy
Math
Simulation
125
Valid Palindrome
Easy
Two Pointers
String
189
Rotate Array
Medium
Array
Math
121
Best Time to Buy and Sell Stock
Easy
Array
Dynamic Programming
1253
Reconstruct a 2-Row Binary Matrix
Medium
Array
Greedy
42
Trapping Rain Water
Hard
Array
Two Pointers
3
Longest Substring Without Repeating Characters
Medium
Hash Table
String
46
Permutations
Medium
Array
Backtracking
