Browse LeetCode problems frequently asked by Dell. Filter by difficulty and timeframe to focus your interview prep.
Last updated: 20 May 2026
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30 days
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More than 6 months
All
Easy
Medium
Hard
All
All Topics
Array
String
Hash Table
Math
Dynamic Programming
Sorting
Greedy
Depth-First Search
Binary Search
Database
Bit Manipulation
Matrix
Tree
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Two Pointers
Prefix Sum
Heap (Priority Queue)
Simulation
Counting
Graph Theory
Binary Tree
Stack
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Enumeration
Design
Backtracking
Union-Find
Number Theory
Linked List
Ordered Set
Segment Tree
Monotonic Stack
Divide and Conquer
Trie
Combinatorics
Bitmask
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Probability and Statistics
Minimum Spanning Tree
Bucket Sort
Shell
Reservoir Sampling
Eulerian Circuit
Radix Sort
Strongly Connected Component
Rejection Sampling
Biconnected Component
Problem
Difficulty
Frequency
Topics
Delete Duplicate Emails
EASY
62.5%
Database
Longest Substring Without Repeating Characters
MEDIUM
62.5%
Hash TableStringSliding Window
Group Anagrams
MEDIUM
62.5%
ArrayHash TableStringSorting
Department Top Three Salaries
HARD
62.5%
Database
Two Sum
EASY
62.5%
ArrayHash Table
Count Binary Substrings
EASY
100%
Two PointersString
Minimum Value to Get Positive Step by Step Sum
EASY
62.5%
ArrayPrefix Sum
Break a Palindrome
MEDIUM
87.5%
StringGreedy
Valid Parentheses
EASY
62.5%
StringStack
Maximum Subarray
MEDIUM
62.5%
ArrayDivide and ConquerDynamic Programming
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