Problems

Algorithm Problems from leetcode

list of all Problems from leetcode.


1    Easy    Two Sum
2    Medium    Add Two Numbers
3    Medium    Longest Substring Without Repeating Characters
4    Hard    Median of Two Sorted Arrays
5    Medium    Longest Palindromic Substring
6    Medium    ZigZag Conversion
7    Easy    Reverse Integer
8    Medium    String to Integer (atoi)
9    Easy    Palindrome Number
10    Hard    Regular Expression Matching
11    Medium    Container With Most Water
12    Medium    Integer to Roman
13    Easy    Roman to Integer
14    Easy    Longest Common Prefix
15    Medium    3Sum
16    Medium    3Sum Closest
17    Medium    Letter Combinations of a Phone Number
18    Medium    4Sum
19    Medium    Remove Nth Node From End of List
20    Easy    Valid Parentheses
21    Easy    Merge Two Sorted Lists
22    Medium    Generate Parentheses
23    Hard    Merge k Sorted Lists
24    Medium    Swap Nodes in Pairs
25    Hard    Reverse Nodes in k-Group
26    Easy    Remove Duplicates from Sorted Array
27    Easy    Remove Element
28    Easy    Implement strStr()
29    Medium    Divide Two Integers
30    Hard    Substring with Concatenation of All Words
31    Medium    Next Permutation
32    Hard    Longest Valid Parentheses
33    Medium    Search in Rotated Sorted Array
34    Medium    Find First and Last Position of Element in Sorted Array
35    Easy    Search Insert Position
36    Medium    Valid Sudoku
37    Hard    Sudoku Solver
38    Easy    Count and Say
39    Medium    Combination Sum
40    Medium    Combination Sum II
41    Hard    First Missing Positive
42    Hard    Trapping Rain Water
43    Medium    Multiply Strings
44    Hard    Wildcard Matching
45    Hard    Jump Game II
46    Medium    Permutations
47    Medium    Permutations II
48    Medium    Rotate Image
49    Medium    Group Anagrams
50    Medium    Pow(x, n)
51    Hard    N-Queens
52    Hard    N-Queens II
53    Easy    Maximum Subarray
54    Medium    Spiral Matrix
55    Medium    Jump Game
56    Medium    Merge Intervals
57    Hard    Insert Interval
58    Easy    Length of Last Word
59    Medium    Spiral Matrix II
60    Medium    Permutation Sequence
61    Medium    Rotate List
62    Medium    Unique Paths
63    Medium    Unique Paths II
64    Medium    Minimum Path Sum
65    Hard    Valid Number
66    Easy    Plus One
67    Easy    Add Binary
68    Hard    Text Justification
69    Easy    Sqrt(x)
70    Easy    Climbing Stairs
71    Medium    Simplify Path
72    Hard    Edit Distance
73    Medium    Set Matrix Zeroes
74    Medium    Search a 2D Matrix
75    Medium    Sort Colors
76    Hard    Minimum Window Substring
77    Medium    Combinations
78    Medium    Subsets
79    Medium    Word Search
80    Medium    Remove Duplicates from Sorted Array II
81    Medium    Search in Rotated Sorted Array II
82    Medium    Remove Duplicates from Sorted List II
83    Easy    Remove Duplicates from Sorted List
84    Hard    Largest Rectangle in Histogram
85    Hard    Maximal Rectangle
86    Medium    Partition List
87    Hard    Scramble String
88    Easy    Merge Sorted Array
89    Medium    Gray Code
90    Medium    Subsets II
91    Medium    Decode Ways
92    Medium    Reverse Linked List II
93    Medium    Restore IP Addresses
94    Medium    Binary Tree Inorder Traversal
95    Medium    Unique Binary Search Trees II
96    Medium    Unique Binary Search Trees
97    Hard    Interleaving String
98    Medium    Validate Binary Search Tree
99    Hard    Recover Binary Search Tree
100    Easy    Same Tree
101    Easy    Symmetric Tree
102    Medium    Binary Tree Level Order Traversal
103    Medium    Binary Tree Zigzag Level Order Traversal
104    Easy    Maximum Depth of Binary Tree
105    Medium    Construct Binary Tree from Preorder and Inorder Traversal
106    Medium    Construct Binary Tree from Inorder and Postorder Traversal
107    Easy    Binary Tree Level Order Traversal II
108    Easy    Convert Sorted Array to Binary Search Tree
109    Medium    Convert Sorted List to Binary Search Tree
110    Easy    Balanced Binary Tree
111    Easy    Minimum Depth of Binary Tree
112    Easy    Path Sum
113    Medium    Path Sum II
114    Medium    Flatten Binary Tree to Linked List
115    Hard    Distinct Subsequences
116    Medium    Populating Next Right Pointers in Each Node
117    Medium    Populating Next Right Pointers in Each Node II
118    Easy    Pascal’s Triangle
119    Easy    Pascal’s Triangle II
120    Medium    Triangle
121    Easy    Best Time to Buy and Sell Stock
122    Easy    Best Time to Buy and Sell Stock II
123    Hard    Best Time to Buy and Sell Stock III
124    Hard    Binary Tree Maximum Path Sum
125    Easy    Valid Palindrome
126    Hard    Word Ladder II
127    Medium    Word Ladder
128    Hard    Longest Consecutive Sequence
129    Medium    Sum Root to Leaf Numbers
130    Medium    Surrounded Regions
131    Medium    Palindrome Partitioning
132    Hard    Palindrome Partitioning II
133    Medium    Clone Graph
134    Medium    Gas Station
135    Hard    Candy
136    Easy    Single Number
137    Medium    Single Number II
138    Medium    Copy List with Random Pointer
139    Medium    Word Break
140    Hard    Word Break II
141    Easy    Linked List Cycle
142    Medium    Linked List Cycle II
143    Medium    Reorder List
144    Medium    Binary Tree Preorder Traversal
145    Hard    Binary Tree Postorder Traversal
146    Hard    LRU Cache
147    Medium    Insertion Sort List
148    Medium    Sort List
149    Hard    Max Points on a Line
150    Medium    Evaluate Reverse Polish Notation
151    Medium    Reverse Words in a String
152    Medium    Maximum Product Subarray
153    Medium    Find Minimum in Rotated Sorted Array
154    Hard    Find Minimum in Rotated Sorted Array II
155    Easy    Min Stack
156    Medium    Binary Tree Upside Down
157    Easy    Read N Characters Given Read4
158    Hard    Read N Characters Given Read4 II - Call multiple times
159    Hard    Longest Substring with At Most Two Distinct Characters
160    Easy    Intersection of Two Linked Lists
161    Medium    One Edit Distance
162    Medium    Find Peak Element
163    Medium    Missing Ranges
164    Hard    Maximum Gap
165    Medium    Compare Version Numbers
166    Medium    Fraction to Recurring Decimal
167    Easy    Two Sum II - Input array is sorted
168    Easy    Excel Sheet Column Title
169    Easy    Majority Element
170    Easy    Two Sum III - Data structure design
171    Easy    Excel Sheet Column Number
172    Easy    Factorial Trailing Zeroes
173    Medium    Binary Search Tree Iterator
174    Hard    Dungeon Game
175    Easy    Combine Two Tables
176    Easy    Second Highest Salary
177    Medium    Nth Highest Salary
178    Medium    Rank Scores
179    Medium    Largest Number
180    Medium    Consecutive Numbers
181    Easy    Employees Earning More Than Their Managers
182    Easy    Duplicate Emails
183    Easy    Customers Who Never Order
184    Medium    Department Highest Salary
185    Hard    Department Top Three Salaries
186    Medium    Reverse Words in a String II
187    Medium    Repeated DNA Sequences
188    Hard    Best Time to Buy and Sell Stock IV
189    Easy    Rotate Array
190    Easy    Reverse Bits
191    Easy    Number of 1 Bits
192    Medium    Word Frequency
193    Easy    Valid Phone Numbers
194    Medium    Transpose File
195    Easy    Tenth Line
196    Easy    Delete Duplicate Emails
197    Easy    Rising Temperature
198    Easy    House Robber
199    Medium    Binary Tree Right Side View
200    Medium    Number of Islands
201    Medium    Bitwise AND of Numbers Range
202    Easy    Happy Number
203    Easy    Remove Linked List Elements
204    Easy    Count Primes
205    Easy    Isomorphic Strings
206    Easy    Reverse Linked List
207    Medium    Course Schedule
208    Medium    Implement Trie (Prefix Tree)
209    Medium    Minimum Size Subarray Sum
210    Medium    Course Schedule II
211    Medium    Add and Search Word - Data structure design
212    Hard    Word Search II
213    Medium    House Robber II
214    Hard    Shortest Palindrome
215    Medium    Kth Largest Element in an Array
216    Medium    Combination Sum III
217    Easy    Contains Duplicate
218    Hard    The Skyline Problem
219    Easy    Contains Duplicate II
220    Medium    Contains Duplicate III
221    Medium    Maximal Square
222    Medium    Count Complete Tree Nodes
223    Medium    Rectangle Area
224    Hard    Basic Calculator
225    Easy    Implement Stack using Queues
226    Easy    Invert Binary Tree
227    Medium    Basic Calculator II
228    Medium    Summary Ranges
229    Medium    Majority Element II
230    Medium    Kth Smallest Element in a BST
231    Easy    Power of Two
232    Easy    Implement Queue using Stacks
233    Hard    Number of Digit One
234    Easy    Palindrome Linked List
235    Easy    Lowest Common Ancestor of a Binary Search Tree
236    Medium    Lowest Common Ancestor of a Binary Tree
237    Easy    Delete Node in a Linked List
238    Medium    Product of Array Except Self
239    Hard    Sliding Window Maximum
240    Medium    Search a 2D Matrix II
241    Medium    Different Ways to Add Parentheses
242    Easy    Valid Anagram
243    Easy    Shortest Word Distance
244    Medium    Shortest Word Distance II
245    Medium    Shortest Word Distance III
246    Easy    Strobogrammatic Number
247    Medium    Strobogrammatic Number II
248    Hard    Strobogrammatic Number III
249    Medium    Group Shifted Strings
250    Medium    Count Univalue Subtrees
251    Medium    Flatten 2D Vector
252    Easy    Meeting Rooms
253    Medium    Meeting Rooms II
254    Medium    Factor Combinations
255    Medium    Verify Preorder Sequence in Binary Search Tree
256    Easy    Paint House
257    Easy    Binary Tree Paths
258    Easy    Add Digits
259    Medium    3Sum Smaller
260    Medium    Single Number III
261    Medium    Graph Valid Tree
262    Hard    Trips and Users
263    Easy    Ugly Number
264    Medium    Ugly Number II
265    Hard    Paint House II
266    Easy    Palindrome Permutation
267    Medium    Palindrome Permutation II
268    Easy    Missing Number
269    Hard    Alien Dictionary
270    Easy    Closest Binary Search Tree Value
271    Medium    Encode and Decode Strings
272    Hard    Closest Binary Search Tree Value II
273    Hard    Integer to English Words
274    Medium    H-Index
275    Medium    H-Index II
276    Easy    Paint Fence
277    Medium    Find the Celebrity
278    Easy    First Bad Version
279    Medium    Perfect Squares
280    Medium    Wiggle Sort
281    Medium    Zigzag Iterator
282    Hard    Expression Add Operators
283    Easy    Move Zeroes
284    Medium    Peeking Iterator
285    Medium    Inorder Successor in BST
286    Medium    Walls and Gates
287    Medium    Find the Duplicate Number
288    Medium    Unique Word Abbreviation
289    Medium    Game of Life
290    Easy    Word Pattern
291    Hard    Word Pattern II
292    Easy    Nim Game
293    Easy    Flip Game
294    Medium    Flip Game II
295    Hard    Find Median from Data Stream
296    Hard    Best Meeting Point
297    Hard    Serialize and Deserialize Binary Tree
298    Medium    Binary Tree Longest Consecutive Sequence
299    Medium    Bulls and Cows
300    Medium    Longest Increasing Subsequence
301    Hard    Remove Invalid Parentheses
302    Hard    Smallest Rectangle Enclosing Black Pixels
303    Easy    Range Sum Query - Immutable
304    Medium    Range Sum Query 2D - Immutable
305    Hard    Number of Islands II
306    Medium    Additive Number
307    Medium    Range Sum Query - Mutable
308    Hard    Range Sum Query 2D - Mutable
309    Medium    Best Time to Buy and Sell Stock with Cooldown
310    Medium    Minimum Height Trees
311    Medium    Sparse Matrix Multiplication
312    Hard    Burst Balloons
313    Medium    Super Ugly Number
314    Medium    Binary Tree Vertical Order Traversal
315    Hard    Count of Smaller Numbers After Self
316    Hard    Remove Duplicate Letters
317    Hard    Shortest Distance from All Buildings
318    Medium    Maximum Product of Word Lengths
319    Medium    Bulb Switcher
320    Medium    Generalized Abbreviation
321    Hard    Create Maximum Number
322    Medium    Coin Change
323    Medium    Number of Connected Components in an Undirected Graph
324    Medium    Wiggle Sort II
325    Medium    Maximum Size Subarray Sum Equals k
326    Easy    Power of Three
327    Hard    Count of Range Sum
328    Medium    Odd Even Linked List
329    Hard    Longest Increasing Path in a Matrix
330    Hard    Patching Array
331    Medium    Verify Preorder Serialization of a Binary Tree
332    Medium    Reconstruct Itinerary
333    Medium    Largest BST Subtree
334    Medium    Increasing Triplet Subsequence
335    Hard    Self Crossing
336    Hard    Palindrome Pairs
337    Medium    House Robber III
338    Medium    Counting Bits
339    Easy    Nested List Weight Sum
340    Hard    Longest Substring with At Most K Distinct Characters
341    Medium    Flatten Nested List Iterator
342    Easy    Power of Four
343    Medium    Integer Break
344    Easy    Reverse String
345    Easy    Reverse Vowels of a String
346    Easy    Moving Average from Data Stream
347    Medium    Top K Frequent Elements
348    Medium    Design Tic-Tac-Toe
349    Easy    Intersection of Two Arrays
350    Easy    Intersection of Two Arrays II
351    Medium    Android Unlock Patterns
352    Hard    Data Stream as Disjoint Intervals
353    Medium    Design Snake Game
354    Hard    Russian Doll Envelopes
355    Medium    Design Twitter
356    Medium    Line Reflection
357    Medium    Count Numbers with Unique Digits
358    Hard    Rearrange String k Distance Apart
359    Easy    Logger Rate Limiter
360    Medium    Sort Transformed Array
361    Medium    Bomb Enemy
362    Medium    Design Hit Counter
363    Hard    Max Sum of Rectangle No Larger Than K
364    Medium    Nested List Weight Sum II
365    Medium    Water and Jug Problem
366    Medium    Find Leaves of Binary Tree
367    Easy    Valid Perfect Square
368    Medium    Largest Divisible Subset
369    Medium    Plus One Linked List
370    Medium    Range Addition
371    Easy    Sum of Two Integers
372    Medium    Super Pow
373    Medium    Find K Pairs with Smallest Sums
374    Easy    Guess Number Higher or Lower
375    Medium    Guess Number Higher or Lower II
376    Medium    Wiggle Subsequence
377    Medium    Combination Sum IV
378    Medium    Kth Smallest Element in a Sorted Matrix
379    Medium    Design Phone Directory
380    Medium    Insert Delete GetRandom O(1)
381    Hard    Insert Delete GetRandom O(1) - Duplicates allowed
382    Medium    Linked List Random Node
383    Easy    Ransom Note
384    Medium    Shuffle an Array
385    Medium    Mini Parser
386    Medium    Lexicographical Numbers
387    Easy    First Unique Character in a String
388    Medium    Longest Absolute File Path
389    Easy    Find the Difference
390    Medium    Elimination Game
391    Hard    Perfect Rectangle
392    Medium    Is Subsequence
393    Medium    UTF-8 Validation
394    Medium    Decode String
395    Medium    Longest Substring with At Least K Repeating Characters
396    Medium    Rotate Function
397    Medium    Integer Replacement
398    Medium    Random Pick Index
399    Medium    Evaluate Division
400    Easy    Nth Digit
401    Easy    Binary Watch
402    Medium    Remove K Digits
403    Hard    Frog Jump
404    Easy    Sum of Left Leaves
405    Easy    Convert a Number to Hexadecimal
406    Medium    Queue Reconstruction by Height
407    Hard    Trapping Rain Water II
408    Easy    Valid Word Abbreviation
409    Easy    Longest Palindrome
410    Hard    Split Array Largest Sum
411    Hard    Minimum Unique Word Abbreviation
412    Easy    Fizz Buzz
413    Medium    Arithmetic Slices
414    Easy    Third Maximum Number
415    Easy    Add Strings
416    Medium    Partition Equal Subset Sum
417    Medium    Pacific Atlantic Water Flow
418    Medium    Sentence Screen Fitting
419    Medium    Battleships in a Board
420    Hard    Strong Password Checker
421    Medium    Maximum XOR of Two Numbers in an Array
422    Easy    Valid Word Square
423    Medium    Reconstruct Original Digits from English
424    Medium    Longest Repeating Character Replacement
425    Hard    Word Squares
426    Medium    Convert Binary Search Tree to Sorted Doubly Linked List
427    Easy    Construct Quad Tree
428    Hard    Serialize and Deserialize N-ary Tree
429    Easy    N-ary Tree Level Order Traversal
430    Medium    Flatten a Multilevel Doubly Linked List
431    Hard    Encode N-ary Tree to Binary Tree
432    Hard    All O`one Data Structure
433    Medium    Minimum Genetic Mutation
434    Easy    Number of Segments in a String
435    Medium    Non-overlapping Intervals
436    Medium    Find Right Interval
437    Easy    Path Sum III
438    Easy    Find All Anagrams in a String
439    Medium    Ternary Expression Parser
440    Hard    K-th Smallest in Lexicographical Order
441    Easy    Arranging Coins
442    Medium    Find All Duplicates in an Array
443    Easy    String Compression
444    Medium    Sequence Reconstruction
445    Medium    Add Two Numbers II
446    Hard    Arithmetic Slices II - Subsequence
447    Easy    Number of Boomerangs
448    Easy    Find All Numbers Disappeared in an Array
449    Medium    Serialize and Deserialize BST
450    Medium    Delete Node in a BST
451    Medium    Sort Characters By Frequency
452    Medium    Minimum Number of Arrows to Burst Balloons
453    Easy    Minimum Moves to Equal Array Elements
454    Medium    4Sum II
455    Easy    Assign Cookies
456    Medium    132 Pattern
457    Medium    Circular Array Loop
458    Hard    Poor Pigs
459    Easy    Repeated Substring Pattern
460    Hard    LFU Cache
461    Easy    Hamming Distance
462    Medium    Minimum Moves to Equal Array Elements II
463    Easy    Island Perimeter
464    Medium    Can I Win
465    Hard    Optimal Account Balancing
466    Hard    Count The Repetitions
467    Medium    Unique Substrings in Wraparound String
468    Medium    Validate IP Address
469    Medium    Convex Polygon
470    Medium    Implement Rand10() Using Rand7()
471    Hard    Encode String with Shortest Length
472    Hard    Concatenated Words
473    Medium    Matchsticks to Square
474    Medium    Ones and Zeroes
475    Easy    Heaters
476    Easy    Number Complement
477    Medium    Total Hamming Distance
478    Medium    Generate Random Point in a Circle
479    Hard    Largest Palindrome Product
480    Hard    Sliding Window Median
481    Medium    Magical String
482    Easy    License Key Formatting
483    Hard    Smallest Good Base
484    Medium    Find Permutation
485    Easy    Max Consecutive Ones
486    Medium    Predict the Winner
487    Medium    Max Consecutive Ones II
488    Hard    Zuma Game
489    Hard    Robot Room Cleaner
490    Medium    The Maze
491    Medium    Increasing Subsequences
492    Easy    Construct the Rectangle
493    Hard    Reverse Pairs
494    Medium    Target Sum
495    Medium    Teemo Attacking
496    Easy    Next Greater Element I
497    Medium    Random Point in Non-overlapping Rectangles
498    Medium    Diagonal Traverse
499    Hard    The Maze III
500    Easy    Keyboard Row
501    Easy    Find Mode in Binary Search Tree
502    Hard    IPO
503    Medium    Next Greater Element II
504    Easy    Base 7
505    Medium    The Maze II
506    Easy    Relative Ranks
507    Easy    Perfect Number
508    Medium    Most Frequent Subtree Sum
509    Easy    Fibonacci Number
510    Medium    Inorder Successor in BST II
513    Medium    Find Bottom Left Tree Value
514    Hard    Freedom Trail
515    Medium    Find Largest Value in Each Tree Row
516    Medium    Longest Palindromic Subsequence
517    Hard    Super Washing Machines
518    Medium    Coin Change 2
519    Medium    Random Flip Matrix
520    Easy    Detect Capital
521    Easy    Longest Uncommon Subsequence I
522    Medium    Longest Uncommon Subsequence II
523    Medium    Continuous Subarray Sum
524    Medium    Longest Word in Dictionary through Deleting
525    Medium    Contiguous Array
526    Medium    Beautiful Arrangement
527    Hard    Word Abbreviation
528    Medium    Random Pick with Weight
529    Medium    Minesweeper
530    Easy    Minimum Absolute Difference in BST
531    Medium    Lonely Pixel I
532    Easy    K-diff Pairs in an Array
533    Medium    Lonely Pixel II
535    Medium    Encode and Decode TinyURL
536    Medium    Construct Binary Tree from String
537    Medium    Complex Number Multiplication
538    Easy    Convert BST to Greater Tree
539    Medium    Minimum Time Difference
540    Medium    Single Element in a Sorted Array
541    Easy    Reverse String II
542    Medium    01 Matrix
543    Easy    Diameter of Binary Tree
544    Medium    Output Contest Matches
545    Medium    Boundary of Binary Tree
546    Hard    Remove Boxes
547    Medium    Friend Circles
548    Medium    Split Array with Equal Sum
549    Medium    Binary Tree Longest Consecutive Sequence II
551    Easy    Student Attendance Record I
552    Hard    Student Attendance Record II
553    Medium    Optimal Division
554    Medium    Brick Wall
555    Medium    Split Concatenated Strings
556    Medium    Next Greater Element III
557    Easy    Reverse Words in a String III
558    Easy    Quad Tree Intersection
559    Easy    Maximum Depth of N-ary Tree
560    Medium    Subarray Sum Equals K
561    Easy    Array Partition I
562    Medium    Longest Line of Consecutive One in Matrix
563    Easy    Binary Tree Tilt
564    Hard    Find the Closest Palindrome
565    Medium    Array Nesting
566    Easy    Reshape the Matrix
567    Medium    Permutation in String
568    Hard    Maximum Vacation Days
569    Hard    Median Employee Salary
570    Medium    Managers with at Least 5 Direct Reports
571    Hard    Find Median Given Frequency of Numbers
572    Easy    Subtree of Another Tree
573    Medium    Squirrel Simulation
574    Medium    Winning Candidate
575    Easy    Distribute Candies
576    Medium    Out of Boundary Paths
577    Easy    Employee Bonus
578    Medium    Get Highest Answer Rate Question
579    Hard    Find Cumulative Salary of an Employee
580    Medium    Count Student Number in Departments
581    Easy    Shortest Unsorted Continuous Subarray
582    Medium    Kill Process
583    Medium    Delete Operation for Two Strings
584    Easy    Find Customer Referee
585    Medium    Investments in 2016
586    Easy    Customer Placing the Largest Number of Orders
587    Hard    Erect the Fence
588    Hard    Design In-Memory File System
589    Easy    N-ary Tree Preorder Traversal
590    Easy    N-ary Tree Postorder Traversal
591    Hard    Tag Validator
592    Medium    Fraction Addition and Subtraction
593    Medium    Valid Square
594    Easy    Longest Harmonious Subsequence
595    Easy    Big Countries
596    Easy    Classes More Than 5 Students
597    Easy    Friend Requests I: Overall Acceptance Rate
598    Easy    Range Addition II
599    Easy    Minimum Index Sum of Two Lists
600    Hard    Non-negative Integers without Consecutive Ones
601    Hard    Human Traffic of Stadium
602    Medium    Friend Requests II: Who Has the Most Friends
603    Easy    Consecutive Available Seats
604    Easy    Design Compressed String Iterator
605    Easy    Can Place Flowers
606    Easy    Construct String from Binary Tree
607    Easy    Sales Person
608    Medium    Tree Node
609    Medium    Find Duplicate File in System
610    Easy    Triangle Judgement
611    Medium    Valid Triangle Number
612    Medium    Shortest Distance in a Plane
613    Easy    Shortest Distance in a Line
614    Medium    Second Degree Follower
615    Hard    Average Salary: Departments VS Company
616    Medium    Add Bold Tag in String
617    Easy    Merge Two Binary Trees
618    Hard    Students Report By Geography
619    Easy    Biggest Single Number
620    Easy    Not Boring Movies
621    Medium    Task Scheduler
622    Medium    Design Circular Queue
623    Medium    Add One Row to Tree
624    Easy    Maximum Distance in Arrays
625    Medium    Minimum Factorization
626    Medium    Exchange Seats
627    Easy    Swap Salary
628    Easy    Maximum Product of Three Numbers
629    Hard    K Inverse Pairs Array
630    Hard    Course Schedule III
631    Hard    Design Excel Sum Formula
632    Hard    Smallest Range
633    Easy    Sum of Square Numbers
634    Medium    Find the Derangement of An Array
635    Medium    Design Log Storage System
636    Medium    Exclusive Time of Functions
637    Easy    Average of Levels in Binary Tree
638    Medium    Shopping Offers
639    Hard    Decode Ways II
640    Medium    Solve the Equation
641    Medium    Design Circular Deque
642    Hard    Design Search Autocomplete System
643    Easy    Maximum Average Subarray I
644    Hard    Maximum Average Subarray II
645    Easy    Set Mismatch
646    Medium    Maximum Length of Pair Chain
647    Medium    Palindromic Substrings
648    Medium    Replace Words
649    Medium    Dota2 Senate
650    Medium    2 Keys Keyboard
651    Medium    4 Keys Keyboard
652    Medium    Find Duplicate Subtrees
653    Easy    Two Sum IV - Input is a BST
654    Medium    Maximum Binary Tree
655    Medium    Print Binary Tree
656    Hard    Coin Path
657    Easy    Robot Return to Origin
658    Medium    Find K Closest Elements
659    Medium    Split Array into Consecutive Subsequences
660    Hard    Remove 9
661    Easy    Image Smoother
662    Medium    Maximum Width of Binary Tree
663    Medium    Equal Tree Partition
664    Hard    Strange Printer
665    Easy    Non-decreasing Array
666    Medium    Path Sum IV
667    Medium    Beautiful Arrangement II
668    Hard    Kth Smallest Number in Multiplication Table
669    Easy    Trim a Binary Search Tree
670    Medium    Maximum Swap
671    Easy    Second Minimum Node In a Binary Tree
672    Medium    Bulb Switcher II
673    Medium    Number of Longest Increasing Subsequence
674    Easy    Longest Continuous Increasing Subsequence
675    Hard    Cut Off Trees for Golf Event
676    Medium    Implement Magic Dictionary
677    Medium    Map Sum Pairs
678    Medium    Valid Parenthesis String
679    Hard    24 Game
680    Easy    Valid Palindrome II
681    Medium    Next Closest Time
682    Easy    Baseball Game
683    Hard    K Empty Slots
684    Medium    Redundant Connection
685    Hard    Redundant Connection II
686    Easy    Repeated String Match
687    Easy    Longest Univalue Path
688    Medium    Knight Probability in Chessboard
689    Hard    Maximum Sum of 3 Non-Overlapping Subarrays
690    Easy    Employee Importance
691    Hard    Stickers to Spell Word
692    Medium    Top K Frequent Words
693    Easy    Binary Number with Alternating Bits
694    Medium    Number of Distinct Islands
695    Medium    Max Area of Island
696    Easy    Count Binary Substrings
697    Easy    Degree of an Array
698    Medium    Partition to K Equal Sum Subsets
699    Hard    Falling Squares
700    Easy    Search in a Binary Search Tree
701    Medium    Insert into a Binary Search Tree
702    Medium    Search in a Sorted Array of Unknown Size
703    Easy    Kth Largest Element in a Stream
704    Easy    Binary Search
705    Easy    Design HashSet
706    Easy    Design HashMap
707    Easy    Design Linked List
708    Medium    Insert into a Cyclic Sorted List
709    Easy    To Lower Case
710    Hard    Random Pick with Blacklist
711    Hard    Number of Distinct Islands II
712    Medium    Minimum ASCII Delete Sum for Two Strings
713    Medium    Subarray Product Less Than K
714    Medium    Best Time to Buy and Sell Stock with Transaction Fee
715    Hard    Range Module
716    Easy    Max Stack
717    Easy    1-bit and 2-bit Characters
718    Medium    Maximum Length of Repeated Subarray
719    Hard    Find K-th Smallest Pair Distance
720    Easy    Longest Word in Dictionary
721    Medium    Accounts Merge
722    Medium    Remove Comments
723    Medium    Candy Crush
724    Easy    Find Pivot Index
725    Medium    Split Linked List in Parts
726    Hard    Number of Atoms
727    Hard    Minimum Window Subsequence
728    Easy    Self Dividing Numbers
729    Medium    My Calendar I
730    Hard    Count Different Palindromic Subsequences
731    Medium    My Calendar II
732    Hard    My Calendar III
733    Easy    Flood Fill
734    Easy    Sentence Similarity
735    Medium    Asteroid Collision
736    Hard    Parse Lisp Expression
737    Medium    Sentence Similarity II
738    Medium    Monotone Increasing Digits
739    Medium    Daily Temperatures
740    Medium    Delete and Earn
741    Hard    Cherry Pickup
742    Medium    Closest Leaf in a Binary Tree
743    Medium    Network Delay Time
744    Easy    Find Smallest Letter Greater Than Target
745    Hard    Prefix and Suffix Search
746    Easy    Min Cost Climbing Stairs
747    Easy    Largest Number At Least Twice of Others
748    Easy    Shortest Completing Word
749    Hard    Contain Virus
750    Medium    Number Of Corner Rectangles
751    Easy    IP to CIDR
752    Medium    Open the Lock
753    Hard    Cracking the Safe
754    Easy    Reach a Number
755    Medium    Pour Water
756    Medium    Pyramid Transition Matrix
757    Hard    Set Intersection Size At Least Two
758    Easy    Bold Words in String
759    Hard    Employee Free Time
760    Easy    Find Anagram Mappings
761    Hard    Special Binary String
762    Easy    Prime Number of Set Bits in Binary Representation
763    Medium    Partition Labels
764    Medium    Largest Plus Sign
765    Hard    Couples Holding Hands
766    Easy    Toeplitz Matrix
767    Medium    Reorganize String
768    Hard    Max Chunks To Make Sorted II
769    Medium    Max Chunks To Make Sorted
770    Hard    Basic Calculator IV
771    Easy    Jewels and Stones
772    Hard    Basic Calculator III
773    Hard    Sliding Puzzle
774    Hard    Minimize Max Distance to Gas Station
775    Medium    Global and Local Inversions
776    Medium    Split BST
777    Medium    Swap Adjacent in LR String
778    Hard    Swim in Rising Water
779    Medium    K-th Symbol in Grammar
780    Hard    Reaching Points
781    Medium    Rabbits in Forest
782    Hard    Transform to Chessboard
783    Easy    Minimum Distance Between BST Nodes
784    Easy    Letter Case Permutation
785    Medium    Is Graph Bipartite?
786    Hard    K-th Smallest Prime Fraction
787    Medium    Cheapest Flights Within K Stops
788    Easy    Rotated Digits
789    Medium    Escape The Ghosts
790    Medium    Domino and Tromino Tiling
791    Medium    Custom Sort String
792    Medium    Number of Matching Subsequences
793    Hard    Preimage Size of Factorial Zeroes Function
794    Medium    Valid Tic-Tac-Toe State
795    Medium    Number of Subarrays with Bounded Maximum
796    Easy    Rotate String
797    Medium    All Paths From Source to Target
798    Hard    Smallest Rotation with Highest Score
799    Medium    Champagne Tower
800    Easy    Similar RGB Color
801    Medium    Minimum Swaps To Make Sequences Increasing
802    Medium    Find Eventual Safe States
803    Hard    Bricks Falling When Hit
804    Easy    Unique Morse Code Words
805    Hard    Split Array With Same Average
806    Easy    Number of Lines To Write String
807    Medium    Max Increase to Keep City Skyline
808    Medium    Soup Servings
809    Medium    Expressive Words
810    Hard    Chalkboard XOR Game
811    Easy    Subdomain Visit Count
812    Easy    Largest Triangle Area
813    Medium    Largest Sum of Averages
814    Medium    Binary Tree Pruning
815    Hard    Bus Routes
816    Medium    Ambiguous Coordinates
817    Medium    Linked List Components
818    Hard    Race Car
819    Easy    Most Common Word
820    Medium    Short Encoding of Words
821    Easy    Shortest Distance to a Character
822    Medium    Card Flipping Game
823    Medium    Binary Trees With Factors
824    Easy    Goat Latin
825    Medium    Friends Of Appropriate Ages
826    Medium    Most Profit Assigning Work
827    Hard    Making A Large Island
828    Hard    Unique Letter String
829    Hard    Consecutive Numbers Sum
830    Easy    Positions of Large Groups
831    Medium    Masking Personal Information
832    Easy    Flipping an Image
833    Medium    Find And Replace in String
834    Hard    Sum of Distances in Tree
835    Medium    Image Overlap
836    Easy    Rectangle Overlap
837    Medium    New 21 Game
838    Medium    Push Dominoes
839    Hard    Similar String Groups
840    Easy    Magic Squares In Grid
841    Medium    Keys and Rooms
842    Medium    Split Array into Fibonacci Sequence
843    Hard    Guess the Word
844    Easy    Backspace String Compare
845    Medium    Longest Mountain in Array
846    Medium    Hand of Straights
847    Hard    Shortest Path Visiting All Nodes
848    Medium    Shifting Letters
849    Easy    Maximize Distance to Closest Person
850    Hard    Rectangle Area II
851    Medium    Loud and Rich
852    Easy    Peak Index in a Mountain Array
853    Medium    Car Fleet
854    Hard    K-Similar Strings
855    Medium    Exam Room
856    Medium    Score of Parentheses
857    Hard    Minimum Cost to Hire K Workers
858    Medium    Mirror Reflection
859    Easy    Buddy Strings
860    Easy    Lemonade Change
861    Medium    Score After Flipping Matrix
862    Hard    Shortest Subarray with Sum at Least K
863    Medium    All Nodes Distance K in Binary Tree
864    Hard    Shortest Path to Get All Keys
865    Medium    Smallest Subtree with all the Deepest Nodes
866    Medium    Prime Palindrome
867    Easy    Transpose Matrix
868    Easy    Binary Gap
869    Medium    Reordered Power of 2
870    Medium    Advantage Shuffle
871    Hard    Minimum Number of Refueling Stops
872    Easy    Leaf-Similar Trees
873    Medium    Length of Longest Fibonacci Subsequence
874    Easy    Walking Robot Simulation
875    Medium    Koko Eating Bananas
876    Easy    Middle of the Linked List
877    Medium    Stone Game
878    Hard    Nth Magical Number
879    Hard    Profitable Schemes
880    Medium    Decoded String at Index
881    Medium    Boats to Save People
882    Hard    Reachable Nodes In Subdivided Graph
883    Easy    Projection Area of 3D Shapes
884    Easy    Uncommon Words from Two Sentences
885    Medium    Spiral Matrix III
886    Medium    Possible Bipartition
887    Hard    Super Egg Drop
888    Easy    Fair Candy Swap
889    Medium    Construct Binary Tree from Preorder and Postorder Traversal
890    Medium    Find and Replace Pattern
891    Hard    Sum of Subsequence Widths
892    Easy    Surface Area of 3D Shapes
893    Easy    Groups of Special-Equivalent Strings
894    Medium    All Possible Full Binary Trees
895    Hard    Maximum Frequency Stack
896    Easy    Monotonic Array
897    Easy    Increasing Order Search Tree
898    Medium    Bitwise ORs of Subarrays
899    Hard    Orderly Queue
900    Medium    RLE Iterator
901    Medium    Online Stock Span
902    Hard    Numbers At Most N Given Digit Set
903    Hard    Valid Permutations for DI Sequence
904    Medium    Fruit Into Baskets
905    Easy    Sort Array By Parity
906    Hard    Super Palindromes
907    Medium    Sum of Subarray Minimums
908    Easy    Smallest Range I
909    Medium    Snakes and Ladders
910    Medium    Smallest Range II
911    Medium    Online Election
912    Medium    Sort an Array
913    Hard    Cat and Mouse
914    Easy    X of a Kind in a Deck of Cards
915    Medium    Partition Array into Disjoint Intervals
916    Medium    Word Subsets
917    Easy    Reverse Only Letters
918    Medium    Maximum Sum Circular Subarray
919    Medium    Complete Binary Tree Inserter
920    Hard    Number of Music Playlists
921    Medium    Minimum Add to Make Parentheses Valid
922    Easy    Sort Array By Parity II
923    Medium    3Sum With Multiplicity
924    Hard    Minimize Malware Spread
925    Easy    Long Pressed Name
926    Medium    Flip String to Monotone Increasing
927    Hard    Three Equal Parts
928    Hard    Minimize Malware Spread II
929    Easy    Unique Email Addresses
930    Medium    Binary Subarrays With Sum
931    Medium    Minimum Falling Path Sum
932    Medium    Beautiful Array
933    Easy    Number of Recent Calls
934    Medium    Shortest Bridge
935    Medium    Knight Dialer
936    Hard    Stamping The Sequence
937    Easy    Reorder Log Files
938    Medium    Range Sum of BST
939    Medium    Minimum Area Rectangle
940    Hard    Distinct Subsequences II
941    Easy    Valid Mountain Array
942    Easy    DI String Match
943    Hard    Find the Shortest Superstring
944    Easy    Delete Columns to Make Sorted
945    Medium    Minimum Increment to Make Array Unique
946    Medium    Validate Stack Sequences
947    Medium    Most Stones Removed with Same Row or Column
948    Medium    Bag of Tokens
949    Easy    Largest Time for Given Digits
950    Medium    Reveal Cards In Increasing Order
951    Medium    Flip Equivalent Binary Trees
952    Hard    Largest Component Size by Common Factor
953    Easy    Verifying an Alien Dictionary
954    Medium    Array of Doubled Pairs
955    Medium    Delete Columns to Make Sorted II
956    Hard    Tallest Billboard
957    Medium    Prison Cells After N Days
958    Medium    Check Completeness of a Binary Tree
959    Medium    Regions Cut By Slashes
960    Hard    Delete Columns to Make Sorted III
961    Easy    N-Repeated Element in Size 2N Array
962    Medium    Maximum Width Ramp
963    Medium    Minimum Area Rectangle II
964    Hard    Least Operators to Express Number
965    Easy    Univalued Binary Tree
966    Medium    Vowel Spellchecker
967    Medium    Numbers With Same Consecutive Differences
968    Hard    Binary Tree Cameras
969    Medium    Pancake Sorting
970    Easy    Powerful Integers
971    Medium    Flip Binary Tree To Match Preorder Traversal
972    Hard    Equal Rational Numbers
973    Medium    K Closest Points to Origin
974    Medium    Subarray Sums Divisible by K
975    Hard    Odd Even Jump
976    Easy    Largest Perimeter Triangle
977    Easy    Squares of a Sorted Array
978    Medium    Longest Turbulent Subarray
979    Medium    Distribute Coins in Binary Tree
980    Hard    Unique Paths III
981    Medium    Time Based Key-Value Store
982    Hard    Triples with Bitwise AND Equal To Zero
983    Medium    Minimum Cost For Tickets
984    Medium    String Without AAA or BBB
985    Easy    Sum of Even Numbers After Queries
986    Medium    Interval List Intersections
987    Medium    Vertical Order Traversal of a Binary Tree
988    Medium    Smallest String Starting From Leaf
989    Easy    Add to Array-Form of Integer
990    Medium    Satisfiability of Equality Equations
991    Medium    Broken Calculator
992    Hard    Subarrays with K Different Integers
993    Easy    Cousins in Binary Tree
994    Easy    Rotting Oranges
995    Hard    Minimum Number of K Consecutive Bit Flips
996    Hard    Number of Squareful Arrays
997    Easy    Find the Town Judge
998    Medium    Maximum Binary Tree II
999    Easy    Available Captures for Rook
1000    Hard    Minimum Cost to Merge Stones
1001    Hard    Grid Illumination
1002    Easy    Find Common Characters
1003    Medium    Check If Word Is Valid After Substitutions
1004    Medium    Max Consecutive Ones III
1005    Easy    Maximize Sum Of Array After K Negations
1006    Medium    Clumsy Factorial
1007    Medium    Minimum Domino Rotations For Equal Row
1008    Medium    Construct Binary Search Tree from Preorder Traversal
1009    Easy    Complement of Base 10 Integer
1010    Easy    Pairs of Songs With Total Durations Divisible by 60
1011    Medium    Capacity To Ship Packages Within D Days
1012    Hard    Numbers With Repeated Digits
1013    Easy    Partition Array Into Three Parts With Equal Sum
1014    Medium    Best Sightseeing Pair
1015    Medium    Smallest Integer Divisible by K
1016    Medium    Binary String With Substrings Representing 1 To N
1017    Medium    Convert to Base -2
1018    Easy    Binary Prefix Divisible By 5
1019    Medium    Next Greater Node In Linked List
1020    Medium    Number of Enclaves
1021    Easy    Remove Outermost Parentheses
1022    Easy    Sum of Root To Leaf Binary Numbers
1023    Medium    Camelcase Matching
1024    Medium    Video Stitching
1025    Easy    Divisor Game
1026    Medium    Maximum Difference Between Node and Ancestor
1027    Medium    Longest Arithmetic Sequence
1028    Hard    Recover a Tree From Preorder Traversal
1029    Easy    Two City Scheduling
1030    Easy    Matrix Cells in Distance Order
1031    Medium    Maximum Sum of Two Non-Overlapping Subarrays
1032    Hard    Stream of Characters


 
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