Question 1

Valid Parentheses — Dell Interview Question

Accepted Answer

"Valid Parentheses" is a easy difficulty problem asked at Dell interviews. It covers the following topics: String, Stack. You can practice it on LeetCode: https://leetcode.com/problems/valid-parentheses

Question 2

Merge k Sorted Lists — Dell Interview Question

Accepted Answer

"Merge k Sorted Lists" is a hard difficulty problem asked at Dell interviews. It covers the following topics: Linked List, Divide and Conquer, Heap (Priority Queue), Merge Sort. You can practice it on LeetCode: https://leetcode.com/problems/merge-k-sorted-lists

Question 3

Longest Substring Without Repeating Characters — Dell Interview Question

Accepted Answer

"Longest Substring Without Repeating Characters" is a medium difficulty problem asked at Dell interviews. It covers the following topics: Hash Table, String, Sliding Window. You can practice it on LeetCode: https://leetcode.com/problems/longest-substring-without-repeating-characters

Question 4

Group Anagrams — Dell Interview Question

Accepted Answer

"Group Anagrams" is a medium difficulty problem asked at Dell interviews. It covers the following topics: Array, Hash Table, String, Sorting. You can practice it on LeetCode: https://leetcode.com/problems/group-anagrams

Question 5

Longest Palindromic Substring — Dell Interview Question

Accepted Answer

"Longest Palindromic Substring" is a medium difficulty problem asked at Dell interviews. It covers the following topics: Two Pointers, String, Dynamic Programming. You can practice it on LeetCode: https://leetcode.com/problems/longest-palindromic-substring

Question 6

Delete Duplicate Emails — Dell Interview Question

Accepted Answer

"Delete Duplicate Emails" is a easy difficulty problem asked at Dell interviews. It covers the following topics: Database. You can practice it on LeetCode: https://leetcode.com/problems/delete-duplicate-emails

#	Question Title	Difficulty	Frequency	Topics
1	Valid Parentheses	EASY	100.0	StringStack
2	Merge k Sorted Lists	HARD	100.0	Linked ListDivide and ConquerHeap (Priority Queue)+1
3	Longest Substring Without Repeating Characters	MEDIUM	100.0	Hash TableStringSliding Window
4	Group Anagrams	MEDIUM	100.0	ArrayHash TableString+1
5	Longest Palindromic Substring	MEDIUM	87.6	Two PointersStringDynamic Programming
6	Delete Duplicate Emails	EASY	87.6	Database
7	Department Top Three Salaries	HARD	87.6	Database

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