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Interview PrepTop Interview 150

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Top Interview 150LeetCode

Must-Do Coding Interview Questions

0% read0 of 150 topics

1. Array / String0/24

Merge Sorted Array10 min

Remove ElementSoon

Remove Duplicates from Sorted ArraySoon

Remove Duplicates from Sorted Array IISoon

Majority Element Rotate Array Best Time to Buy and Sell Stock10 min Best Time to Buy and Sell Stock II10 min

Jump GameSoon

Jump Game IISoon

H-IndexSoon

Insert Delete GetRandom O(1)Soon

Product of Array Except SelfSoon

Gas StationSoon

CandySoon

Trapping Rain WaterSoon

Roman to IntegerSoon

Integer to RomanSoon

Length of Last WordSoon

Longest Common PrefixSoon

Reverse Words in a StringSoon

Zigzag ConversionSoon

Find the Index of the First Occurrence in a StringSoon

Text JustificationSoon

2. Two Pointers0/5

Valid Palindrome12m Is Subsequence10 min

Two Sum II — Input Array Is SortedSoon

Container With Most WaterSoon

3SumSoon

3. Sliding Window0/4

Minimum Size Subarray SumSoon

Longest Substring Without Repeating CharactersSoon

Substring with Concatenation of All WordsSoon

Minimum Window SubstringSoon

4. Matrix0/5

Valid SudokuSoon

Spiral MatrixSoon

Rotate ImageSoon

Set Matrix ZeroesSoon

Game of LifeSoon

5. Hashmap0/9

Ransom NoteSoon

Isomorphic StringsSoon

Word PatternSoon

Valid AnagramSoon

Group AnagramsSoon

Two SumSoon

Happy NumberSoon

Contains Duplicate IISoon

Longest Consecutive SequenceSoon

6. Intervals0/4

Summary RangesSoon

Merge IntervalsSoon

Insert IntervalSoon

Minimum Number of Arrows to Burst BalloonsSoon

7. Stack0/5

Valid ParenthesesSoon

Simplify PathSoon

Min StackSoon

Evaluate Reverse Polish NotationSoon

Basic CalculatorSoon

8. Linked List0/11

Linked List CycleSoon

Add Two NumbersSoon

Merge Two Sorted ListsSoon

Copy List with Random PointerSoon

Reverse Linked List IISoon

Reverse Nodes in k-GroupSoon

Remove Nth Node From End of ListSoon

Remove Duplicates from Sorted List IISoon

Rotate ListSoon

Partition ListSoon

LRU CacheSoon

9. Binary Tree General0/14

Maximum Depth of Binary TreeSoon

Same TreeSoon

Invert Binary TreeSoon

Symmetric TreeSoon

Construct Binary Tree from Preorder and Inorder TraversalSoon

Construct Binary Tree from Inorder and Postorder TraversalSoon

Populating Next Right Pointers in Each Node IISoon

Flatten Binary Tree to Linked ListSoon

Path SumSoon

Sum Root to Leaf NumbersSoon

Binary Tree Maximum Path SumSoon

Binary Search Tree IteratorSoon

Count Complete Tree NodesSoon

Lowest Common Ancestor of a Binary TreeSoon

10. Binary Tree BFS0/4

Binary Tree Right Side ViewSoon

Average of Levels in Binary TreeSoon

Binary Tree Level Order TraversalSoon

Binary Tree Zigzag Level Order TraversalSoon

11. Binary Search Tree0/3

Minimum Absolute Difference in BSTSoon

Kth Smallest Element in a BSTSoon

Validate Binary Search TreeSoon

12. Graph General0/6

Number of IslandsSoon

Surrounded RegionsSoon

Clone GraphSoon

Evaluate DivisionSoon

Course ScheduleSoon

Course Schedule IISoon

13. Graph BFS0/3

Snakes and LaddersSoon

Minimum Genetic MutationSoon

Word LadderSoon

14. Trie0/3

Implement Trie (Prefix Tree)Soon

Design Add and Search Words Data StructureSoon

Word Search IISoon

15. Backtracking0/7

Letter Combinations of a Phone NumberSoon

CombinationsSoon

PermutationsSoon

Combination SumSoon

N-Queens IISoon

Generate ParenthesesSoon

Word SearchSoon

16. Divide & Conquer0/4

Convert Sorted Array to Binary Search TreeSoon

Sort ListSoon

Construct Quad TreeSoon

Merge k Sorted ListsSoon

17. Kadane's Algorithm0/2

Maximum SubarraySoon

Maximum Sum Circular SubarraySoon

18. Binary Search0/7

Search Insert PositionSoon

Search a 2D MatrixSoon

Find Peak ElementSoon

Search in Rotated Sorted ArraySoon

Find First and Last Position of Element in Sorted ArraySoon

Find Minimum in Rotated Sorted ArraySoon

Median of Two Sorted ArraysSoon

19. Heap0/4

Kth Largest Element in an ArraySoon

IPOSoon

Find K Pairs with Smallest SumsSoon

Find Median from Data StreamSoon

20. Bit Manipulation0/6

Add BinarySoon

Reverse BitsSoon

Number of 1 BitsSoon

Single NumberSoon

Single Number IISoon

Bitwise AND of Numbers RangeSoon

21. Math0/6

Palindrome NumberSoon

Plus OneSoon

Factorial Trailing ZeroesSoon

Sqrt(x)Soon

Pow(x, n)Soon

Max Points on a LineSoon

22. 1D Dynamic Programming0/5

Climbing StairsSoon

House RobberSoon

Word BreakSoon

Coin ChangeSoon

Longest Increasing SubsequenceSoon

23. Multidimensional DP0/9

TriangleSoon

Minimum Path SumSoon

Unique Paths IISoon

Longest Palindromic SubstringSoon

Interleaving StringSoon

Edit DistanceSoon

Best Time to Buy and Sell Stock IIISoon

Best Time to Buy and Sell Stock IVSoon

Maximal SquareSoon

Remove Element

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