Deloitte

40 problems

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Problem	Difficulty	Frequency	Topics
23. Merge k Sorted Lists	Hard	100%	Linked ListDivide and ConquerHeap (Priority Queue)Merge SortTournament Sort
1. Two Sum	Easy	95.8%	ArrayHash Table
3. Longest Substring Without Repeating Characters	Medium	84%	Hash TableStringSliding Window
Change Null Values in a Table to the Previous Value	Medium	81.3%	Database
20. Valid Parentheses	Easy	78.3%	StringStackBracket Sequences
Second Highest Salary	Medium	78.3%	Database
5. Longest Palindromic Substring	Medium	74.7%	Two PointersStringDynamic ProgrammingManacher
9. Palindrome Number	Easy	70.5%	Math
121. Best Time to Buy and Sell Stock	Easy	70.5%	ArrayDynamic Programming
49. Group Anagrams	Medium	70.5%	ArrayHash TableStringSorting
14. Longest Common Prefix	Easy	65.4%	ArrayStringTrie
11. Container With Most Water	Medium	65.4%	ArrayTwo PointersGreedy
56. Merge Intervals	Medium	65.4%	ArraySortingQuicksort
Managers with at Least 5 Direct Reports	Medium	58.8%	Database
2594. Minimum Time to Repair Cars	Medium	58.8%	ArrayBinary Search
53. Maximum Subarray	Medium	58.8%	ArrayDivide and ConquerDynamic Programming
387. First Unique Character in a String	Easy	58.8%	Hash TableStringQueueCounting
Nth Highest Salary	Medium	58.8%	Database
3Sum	Medium	58.8%	ArrayTwo PointersSorting
Remove Duplicates from Sorted Array	Easy	58.8%	ArrayTwo Pointers
67. Add Binary	Easy	58.8%	MathStringBit ManipulationSimulation
242. Valid Anagram	Easy	58.8%	Hash TableStringSorting
70. Climbing Stairs	Easy	58.8%	MathDynamic ProgrammingMemoization
125. Valid Palindrome	Easy	58.8%	Two PointersString
Rising Temperature	Easy	49.6%	Database