Problems

120 problems · 0 solved

0/42

Easy

0/48

Medium

0/30

Hard

120 problems

			Tags
Edit Distance	Hard	90%	StringDynamic Programming
Candy	Hard	100%	ArrayGreedy
Jump Game II	Hard	88%	ArrayDynamic ProgrammingGreedy
Text Justification	Hard	73%	ArrayStringSimulation
First Missing Positive	Hard	62%	ArrayHash Table
Meeting Rooms II	Medium	67%	ArrayTwo PointersGreedy+2
Letter Combinations of a Phone Number	Medium	71%	Hash TableStringBacktracking
Find Minimum in Rotated Sorted Array	Medium	86%	ArrayBinary Search
Gas Station	Medium	100%	ArrayGreedy
Rotting Oranges	Medium	93%	ArrayBFSMatrix
Longest Increasing Subsequence	Medium	60%	ArrayBinary SearchDynamic Programming
Min Stack	Medium	97%	StackDesign
Container With Most Water	Medium	88%	ArrayTwo PointersGreedy
First Bad Version	Easy	64%	Binary SearchInteractive
Flood Fill	Easy	69%	ArrayDFSBFS+1
Count Bits	Easy	100%	Dynamic ProgrammingBit Manipulation
Sqrt(x)	Easy	68%	MathBinary Search
Path Sum	Easy	70%	TreeDFSBinary Tree
Fibonacci Number	Easy	77%	MathDynamic ProgrammingRecursion+1
Reverse String	Easy	90%	Two PointersString
Distinct Subsequences	Hard	87%	StringDynamic Programming
Maximal Rectangle	Hard	75%	ArrayDynamic ProgrammingStack+2
Find Median from Data Stream	Hard	72%	Two PointersDesignSorting+2
Word Break	Hard	69%	Hash TableStringDynamic Programming+2
Binary Tree Maximum Path Sum	Hard	91%	Dynamic ProgrammingTreeDFS+1
Permutations	Medium	75%	ArrayBacktracking
Evaluate Reverse Polish Notation	Medium	85%	ArrayMathStack
Kth Largest Element in an Array	Medium	94%	ArrayDivide and ConquerSorting+2
Top K Frequent Elements	Medium	90%	ArrayHash TableDivide and Conquer+3
Subsets	Medium	91%	ArrayBacktrackingBit Manipulation
Combination Sum	Medium	60%	ArrayBacktracking
Unique Paths	Medium	73%	MathDynamic ProgrammingCombinatorics
Rotate Image	Medium	86%	ArrayMathMatrix
Power of Two	Easy	93%	MathBit ManipulationRecursion
Happy Number	Easy	65%	Hash TableMathTwo Pointers
Same Tree	Easy	67%	TreeDFSBFS+1
Symmetric Tree	Easy	80%	TreeDFSBFS+1
Move Zeroes	Easy	95%	ArrayTwo Pointers
Missing Number	Easy	76%	ArrayHash TableMath+2
Linked List Cycle	Easy	76%	Hash TableLinked ListTwo Pointers
Distinct Subsequences	Hard	96%	StringDynamic Programming
Maximal Rectangle	Hard	93%	ArrayDynamic ProgrammingStack+2
Find Median from Data Stream	Hard	86%	Two PointersDesignSorting+2
Word Break	Hard	90%	Hash TableStringDynamic Programming+2
Binary Tree Maximum Path Sum	Hard	82%	Dynamic ProgrammingTreeDFS+1
Permutations	Medium	62%	ArrayBacktracking
Evaluate Reverse Polish Notation	Medium	61%	ArrayMathStack
Kth Largest Element in an Array	Medium	93%	ArrayDivide and ConquerSorting+2
Top K Frequent Elements	Medium	82%	ArrayHash TableDivide and Conquer+3
Subsets	Medium	88%	ArrayBacktrackingBit Manipulation
Combination Sum	Medium	93%	ArrayBacktracking
Unique Paths	Medium	83%	MathDynamic ProgrammingCombinatorics
Rotate Image	Medium	99%	ArrayMathMatrix
Power of Two	Easy	69%	MathBit ManipulationRecursion
Happy Number	Easy	85%	Hash TableMathTwo Pointers
Same Tree	Easy	90%	TreeDFSBFS+1
Symmetric Tree	Easy	92%	TreeDFSBFS+1
Move Zeroes	Easy	92%	ArrayTwo Pointers
Missing Number	Easy	90%	ArrayHash TableMath+2
Linked List Cycle	Easy	94%	Hash TableLinked ListTwo Pointers
Serialize and Deserialize Binary Tree	Hard	92%	StringTreeDFS+3
Regular Expression Matching	Hard	100%	StringDynamic ProgrammingRecursion
Sliding Window Maximum	Hard	97%	ArrayQueueSliding Window+1
Largest Rectangle in Histogram	Hard	90%	ArrayStackMonotonic Stack
Minimum Window Substring	Hard	67%	Hash TableStringSliding Window
Word Search	Medium	82%	ArrayBacktrackingMatrix+1
Spiral Matrix	Medium	92%	ArrayMatrixSimulation
Decode Ways	Medium	99%	StringDynamic Programming
Course Schedule	Medium	72%	DFSBFSGraph+1
Number of Islands	Medium	81%	ArrayDFSBFS+2
House Robber	Medium	67%	ArrayDynamic Programming
Search in Rotated Sorted Array	Medium	66%	ArrayBinary Search
Jump Game	Medium	90%	ArrayDynamic ProgrammingGreedy
Majority Element	Easy	96%	ArrayHash TableDivide and Conquer+2
Roman to Integer	Easy	74%	Hash TableMathString
Reverse Linked List	Easy	87%	Linked ListRecursion
Invert Binary Tree	Easy	73%	TreeDFSBFS+1
Binary Search	Easy	83%	ArrayBinary Search
Climbing Stairs	Easy	86%	MathDynamic ProgrammingMemoization
Single Number	Easy	68%	ArrayBit Manipulation
Longest Valid Parentheses	Hard	96%	StringDynamic ProgrammingStack
N-Queens	Hard	74%	BacktrackingArray
Trapping Rain Water	Hard	88%	ArrayTwo PointersStack+1
Merge K Sorted Lists	Hard	68%	Linked ListDivide and ConquerHeap
Median of Two Sorted Arrays	Hard	72%	ArrayBinary SearchDivide and Conquer
Longest Palindromic Substring	Medium	71%	StringDynamic Programming
Binary Tree Level Order Traversal	Medium	86%	TreeBFSBinary Tree
Coin Change	Medium	63%	Dynamic ProgrammingBFS
Validate Binary Search Tree	Medium	63%	TreeDFSBinary Search Tree+1
Product of Array Except Self	Medium	74%	ArrayPrefix Sum
Group Anagrams	Medium	71%	ArrayHash TableString+1
3Sum	Medium	97%	ArrayTwo PointersSorting
Longest Substring Without Repeating Characters	Medium	91%	StringSliding WindowHash Table
Contains Duplicate	Easy	70%	ArrayHash TableSorting
Maximum Subarray	Easy	63%	ArrayDynamic ProgrammingDivide and Conquer
Palindrome Number	Easy	83%	Math
Best Time to Buy and Sell Stock	Easy	79%	ArrayDynamic Programming
Merge Two Sorted Lists	Easy	79%	Linked ListRecursion
Valid Parentheses	Easy	95%	StringStack
Two Sum	Easy	64%	ArrayHash Table
Longest Valid Parentheses	Hard	63%	StringDynamic ProgrammingStack
N-Queens	Hard	83%	BacktrackingArray
Trapping Rain Water	Hard	90%	ArrayTwo PointersStack+1
Merge K Sorted Lists	Hard	71%	Linked ListDivide and ConquerHeap
Median of Two Sorted Arrays	Hard	95%	ArrayBinary SearchDivide and Conquer
Longest Palindromic Substring	Medium	92%	StringDynamic Programming
Binary Tree Level Order Traversal	Medium	88%	TreeBFSBinary Tree
Coin Change	Medium	67%	Dynamic ProgrammingBFS
Validate Binary Search Tree	Medium	88%	TreeDFSBinary Search Tree+1
Product of Array Except Self	Medium	72%	ArrayPrefix Sum
Group Anagrams	Medium	63%	ArrayHash TableString+1
3Sum	Medium	83%	ArrayTwo PointersSorting
Longest Substring Without Repeating Characters	Medium	60%	StringSliding WindowHash Table
Contains Duplicate	Easy	63%	ArrayHash TableSorting
Maximum Subarray	Easy	91%	ArrayDynamic ProgrammingDivide and Conquer
Palindrome Number	Easy	67%	Math
Best Time to Buy and Sell Stock	Easy	92%	ArrayDynamic Programming
Merge Two Sorted Lists	Easy	94%	Linked ListRecursion
Valid Parentheses	Easy	91%	StringStack
Two Sum	Easy	93%	ArrayHash Table

Edit Distance

Candy

Jump Game II

Text Justification

First Missing Positive

Hard62%

Meeting Rooms II

Medium67%

Letter Combinations of a Phone Number

Medium71%

Find Minimum in Rotated Sorted Array

Medium86%

Gas Station

Medium100%

Rotting Oranges

Medium93%

Longest Increasing Subsequence

Medium60%

Min Stack

Medium97%

Container With Most Water

First Bad Version

Flood Fill

Count Bits

Sqrt(x)

Path Sum

Fibonacci Number

Reverse String

Distinct Subsequences

Hard87%

Maximal Rectangle

Hard75%

Find Median from Data Stream

Hard72%

Word Break

Hard69%

Binary Tree Maximum Path Sum

Hard91%

Permutations

Medium75%

Evaluate Reverse Polish Notation

Medium85%

Kth Largest Element in an Array

Medium94%

Top K Frequent Elements

Subsets

Combination Sum

Unique Paths

Rotate Image

Power of Two

Happy Number

Same Tree

Symmetric Tree

Move Zeroes

Missing Number

Linked List Cycle

Distinct Subsequences

Hard96%

Maximal Rectangle

Hard93%

Find Median from Data Stream

Hard86%

Word Break

Hard90%

Binary Tree Maximum Path Sum

Hard82%

Permutations

Medium62%

Evaluate Reverse Polish Notation

Medium61%

Kth Largest Element in an Array

Medium93%

Top K Frequent Elements

Subsets

Combination Sum

Unique Paths

Rotate Image

Power of Two

Happy Number

Same Tree

Symmetric Tree

Move Zeroes

Missing Number

Linked List Cycle

Serialize and Deserialize Binary Tree

Hard92%

Regular Expression Matching

Hard100%

Sliding Window Maximum

Hard97%

Largest Rectangle in Histogram

Hard90%

Minimum Window Substring

Word Search

Spiral Matrix

Decode Ways

Course Schedule

Number of Islands

House Robber

Search in Rotated Sorted Array

Jump Game

Majority Element

Roman to Integer

Reverse Linked List

Invert Binary Tree

Binary Search

Climbing Stairs

Single Number

Longest Valid Parentheses

N-Queens

Trapping Rain Water

Merge K Sorted Lists

Median of Two Sorted Arrays

Hard72%

Longest Palindromic Substring

Medium71%

Binary Tree Level Order Traversal

Medium86%

Coin Change

Medium63%

Validate Binary Search Tree

Medium63%

Product of Array Except Self

Medium74%

Group Anagrams

Medium71%

3Sum

Medium97%

Longest Substring Without Repeating Characters

Contains Duplicate

Maximum Subarray

Palindrome Number

Best Time to Buy and Sell Stock

Easy79%

Merge Two Sorted Lists

Easy79%

Valid Parentheses

Easy95%

Two Sum

Easy64%

Longest Valid Parentheses

N-Queens

Trapping Rain Water

Merge K Sorted Lists

Median of Two Sorted Arrays

Hard95%

Longest Palindromic Substring

Medium92%

Binary Tree Level Order Traversal

Medium88%

Coin Change

Medium67%

Validate Binary Search Tree

Medium88%

Product of Array Except Self

Medium72%

Group Anagrams

Medium63%

3Sum

Medium83%

Longest Substring Without Repeating Characters

Contains Duplicate

Maximum Subarray

Palindrome Number

Best Time to Buy and Sell Stock

Easy92%

Merge Two Sorted Lists

Easy94%

Valid Parentheses

Easy91%

Two Sum

Easy93%

Problems

Problem List

Problems