|
2
|
Add Two Numbers
|
Medium
|
|
3
|
Longest Substring Without Repeating Characters
|
Medium
|
|
5
|
Longest Palindromic Substring
|
Medium
|
|
6
|
ZigZag Conversion
|
Medium
|
|
8
|
String to Integer (atoi)
|
Medium
|
|
11
|
Container With Most Water
|
Medium
|
|
12
|
Integer to Roman
|
Medium
|
|
15
|
3Sum
|
Medium
|
|
16
|
3Sum Closest
|
Medium
|
|
17
|
Letter Combinations of a Phone Number
|
Medium
|
|
18
|
4Sum
|
Medium
|
|
19
|
Remove Nth Node From End of List
|
Medium
|
|
22
|
Generate Parentheses
|
Medium
|
|
24
|
Swap Nodes in Pairs
|
Medium
|
|
29
|
Divide Two Integers
|
Medium
|
|
31
|
Next Permutation
|
Medium
|
|
33
|
Search in Rotated Sorted Array
|
Medium
|
|
34
|
Find First and Last Position of Element in Sorted Array
|
Medium
|
|
36
|
Valid Sudoku
|
Medium
|
|
38
|
Count and Say
|
Medium
|
|
39
|
Combination Sum
|
Medium
|
|
40
|
Combination Sum II
|
Medium
|
|
43
|
Multiply Strings
|
Medium
|
|
45
|
Jump Game II
|
Medium
|
|
46
|
Permutations
|
Medium
|
|
47
|
Permutations II
|
Medium
|
|
48
|
Rotate Image
|
Medium
|
|
49
|
Group Anagrams
|
Medium
|
|
50
|
Pow(x, n)
|
Medium
|
|
54
|
Spiral Matrix
|
Medium
|
|
55
|
Jump Game
|
Medium
|
|
56
|
Merge Intervals
|
Medium
|
|
57
|
Insert Interval
|
Medium
|
|
59
|
Spiral Matrix II
|
Medium
|
|
61
|
Rotate List
|
Medium
|
|
62
|
Unique Paths
|
Medium
|
|
63
|
Unique Paths II
|
Medium
|
|
64
|
Minimum Path Sum
|
Medium
|
|
71
|
Simplify Path
|
Medium
|
|
73
|
Set Matrix Zeroes
|
Medium
|
|
74
|
Search a 2D Matrix
|
Medium
|
|
75
|
Sort Colors
|
Medium
|
|
77
|
Combinations
|
Medium
|
|
78
|
Subsets
|
Medium
|
|
79
|
Word Search
|
Medium
|
|
80
|
Remove Duplicates from Sorted Array II
|
Medium
|
|
81
|
Search in Rotated Sorted Array II
|
Medium
|
|
82
|
Remove Duplicates from Sorted List II
|
Medium
|
|
86
|
Partition List
|
Medium
|
|
89
|
Gray Code
|
Medium
|
|
90
|
Subsets II
|
Medium
|
|
91
|
Decode Ways
|
Medium
|
|
92
|
Reverse Linked List II
|
Medium
|
|
93
|
Restore IP Addresses
|
Medium
|
|
94
|
Binary Tree Inorder Traversal
|
Medium
|
|
95
|
Unique Binary Search Trees II
|
Medium
|
|
96
|
Unique Binary Search Trees
|
Medium
|
|
97
|
Interleaving String
|
Medium
|
|
98
|
Validate Binary Search Tree
|
Medium
|
|
102
|
Binary Tree Level Order Traversal
|
Medium
|
|
103
|
Binary Tree Zigzag Level Order Traversal
|
Medium
|
|
105
|
Construct Binary Tree from Preorder and Inorder Traversal
|
Medium
|
|
106
|
Construct Binary Tree from Inorder and Postorder Traversal
|
Medium
|
|
107
|
Binary Tree Level Order Traversal II
|
Medium
|
|
109
|
Convert Sorted List to Binary Search Tree
|
Medium
|
|
113
|
Path Sum II
|
Medium
|
|
114
|
Flatten Binary Tree to Linked List
|
Medium
|
|
120
|
Triangle
|
Medium
|
|
129
|
Sum Root to Leaf Numbers
|
Medium
|
|
130
|
Surrounded Regions
|
Medium
|
|
131
|
Palindrome Partitioning
|
Medium
|
|
134
|
Gas Station
|
Medium
|
|
137
|
Single Number II
|
Medium
|
|
139
|
Word Break
|
Medium
|
|
143
|
Reorder List
|
Medium
|
|
144
|
Binary Tree Preorder Traversal
|
Medium
|
|
145
|
Binary Tree Postorder Traversal
|
Medium
|
|
146
|
LRU Cache
|
Medium
|
|
147
|
Insertion Sort List
|
Medium
|
|
148
|
Sort List
|
Medium
|
|
150
|
Evaluate Reverse Polish Notation
|
Medium
|
|
151
|
Reverse Words in a String
|
Medium
|
|
152
|
Maximum Product Subarray
|
Medium
|
|
153
|
Find Minimum in Rotated Sorted Array
|
Medium
|
|
156
|
Binary Tree Upside Down
|
Medium
|
|
159
|
Longest Substring with At Most Two Distinct Characters
|
Medium
|
|
161
|
One Edit Distance
|
Medium
|
|
162
|
Find Peak Element
|
Medium
|
|
165
|
Compare Version Numbers
|
Medium
|
|
166
|
Fraction to Recurring Decimal
|
Medium
|
|
173
|
Binary Search Tree Iterator
|
Medium
|
|
179
|
Largest Number
|
Medium
|
|
186
|
Reverse Words in a String II
|
Medium
|
|
187
|
Repeated DNA Sequences
|
Medium
|
|
189
|
Rotate Array
|
Medium
|
|
198
|
House Robber
|
Medium
|
|
199
|
Binary Tree Right Side View
|
Medium
|
|
200
|
Number of Islands
|
Medium
|
|
201
|
Bitwise AND of Numbers Range
|
Medium
|
|
207
|
Course Schedule
|
Medium
|
|
208
|
Implement Trie (Prefix Tree)
|
Medium
|
|
209
|
Minimum Size Subarray Sum
|
Medium
|
|
210
|
Course Schedule II
|
Medium
|
|
211
|
Design Add and Search Words Data Structure
|
Medium
|
|
213
|
House Robber II
|
Medium
|
|
215
|
Kth Largest Element in an Array
|
Medium
|
|
216
|
Combination Sum III
|
Medium
|
|
220
|
Contains Duplicate III
|
Medium
|
|
221
|
Maximal Square
|
Medium
|
|
222
|
Count Complete Tree Nodes
|
Medium
|
|
223
|
Rectangle Area
|
Medium
|
|
227
|
Basic Calculator II
|
Medium
|
|
229
|
Majority Element II
|
Medium
|
|
230
|
Kth Smallest Element in a BST
|
Medium
|
|
236
|
Lowest Common Ancestor of a Binary Tree
|
Medium
|
|
238
|
Product of Array Except Self
|
Medium
|
|
240
|
Search a 2D Matrix II
|
Medium
|
|
241
|
Different Ways to Add Parentheses
|
Medium
|
|
244
|
Shortest Word Distance II
|
Medium
|
|
245
|
Shortest Word Distance III
|
Medium
|
|
247
|
Strobogrammatic Number II
|
Medium
|
|
249
|
Group Shifted Strings
|
Medium
|
|
250
|
Count Univalue Subtrees
|
Medium
|
|
251
|
Flatten 2D Vector
|
Medium
|
|
253
|
Meeting Rooms II
|
Medium
|
|
254
|
Factor Combinations
|
Medium
|
|
255
|
Verify Preorder Sequence in Binary Search Tree
|
Medium
|
|
256
|
Paint House
|
Medium
|
|
259
|
3Sum Smaller
|
Medium
|
|
260
|
Single Number III
|
Medium
|
|
261
|
Graph Valid Tree
|
Medium
|
|
264
|
Ugly Number II
|
Medium
|
|
267
|
Palindrome Permutation II
|
Medium
|
|
271
|
Encode and Decode Strings
|
Medium
|
|
274
|
H-Index
|
Medium
|
|
275
|
H-Index II
|
Medium
|
|
276
|
Paint Fence
|
Medium
|
|
277
|
Find the Celebrity
|
Medium
|
|
279
|
Perfect Squares
|
Medium
|
|
280
|
Wiggle Sort
|
Medium
|
|
281
|
Zigzag Iterator
|
Medium
|
|
285
|
Inorder Successor in BST
|
Medium
|
|
286
|
Walls and Gates
|
Medium
|
|
287
|
Find the Duplicate Number
|
Medium
|
|
288
|
Unique Word Abbreviation
|
Medium
|
|
289
|
Game of Life
|
Medium
|
|
291
|
Word Pattern II
|
Medium
|
|
294
|
Flip Game II
|
Medium
|
|
298
|
Binary Tree Longest Consecutive Sequence
|
Medium
|
|
299
|
Bulls and Cows
|
Medium
|
|
300
|
Longest Increasing Subsequence
|
Medium
|
|
304
|
Range Sum Query 2D - Immutable
|
Medium
|
|
306
|
Additive Number
|
Medium
|
|
307
|
Range Sum Query - Mutable
|
Medium
|
|
309
|
Best Time to Buy and Sell Stock with Cooldown
|
Medium
|
|
310
|
Minimum Height Trees
|
Medium
|
|
311
|
Sparse Matrix Multiplication
|
Medium
|
|
313
|
Super Ugly Number
|
Medium
|
|
314
|
Binary Tree Vertical Order Traversal
|
Medium
|
|
316
|
Remove Duplicate Letters
|
Medium
|
|
318
|
Maximum Product of Word Lengths
|
Medium
|
|
319
|
Bulb Switcher
|
Medium
|
|
320
|
Generalized Abbreviation
|
Medium
|
|
322
|
Coin Change
|
Medium
|
|
323
|
Number of Connected Components in an Undirected Graph
|
Medium
|
|
324
|
Wiggle Sort II
|
Medium
|
|
325
|
Maximum Size Subarray Sum Equals k
|
Medium
|
|
328
|
Odd Even Linked List
|
Medium
|
|
331
|
Verify Preorder Serialization of a Binary Tree
|
Medium
|
|
332
|
Reconstruct Itinerary
|
Medium
|
|
333
|
Largest BST Subtree
|
Medium
|
|
334
|
Increasing Triplet Subsequence
|
Medium
|
|
337
|
House Robber III
|
Medium
|
|
338
|
Counting Bits
|
Medium
|
|
339
|
Nested List Weight Sum
|
Medium
|
|
340
|
Longest Substring with At Most K Distinct Characters
|
Medium
|
|
341
|
Flatten Nested List Iterator
|
Medium
|
|
343
|
Integer Break
|
Medium
|
|
347
|
Top K Frequent Elements
|
Medium
|
|
348
|
Design Tic-Tac-Toe
|
Medium
|
|
351
|
Android Unlock Patterns
|
Medium
|
|
353
|
Design Snake Game
|
Medium
|
|
355
|
Design Twitter
|
Medium
|
|
356
|
Line Reflection
|
Medium
|
|
357
|
Count Numbers with Unique Digits
|
Medium
|
|
360
|
Sort Transformed Array
|
Medium
|
|
361
|
Bomb Enemy
|
Medium
|
|
362
|
Design Hit Counter
|
Medium
|
|
364
|
Nested List Weight Sum II
|
Medium
|
|
365
|
Water and Jug Problem
|
Medium
|
|
366
|
Find Leaves of Binary Tree
|
Medium
|
|
368
|
Largest Divisible Subset
|
Medium
|
|
369
|
Plus One Linked List
|
Medium
|
|
370
|
Range Addition
|
Medium
|
|
371
|
Sum of Two Integers
|
Medium
|
|
372
|
Super Pow
|
Medium
|
|
373
|
Find K Pairs with Smallest Sums
|
Medium
|
|
375
|
Guess Number Higher or Lower II
|
Medium
|
|
376
|
Wiggle Subsequence
|
Medium
|
|
377
|
Combination Sum IV
|
Medium
|
|
378
|
Kth Smallest Element in a Sorted Matrix
|
Medium
|
|
379
|
Design Phone Directory
|
Medium
|
|
380
|
Insert Delete GetRandom O(1)
|
Medium
|
|
382
|
Linked List Random Node
|
Medium
|
|
384
|
Shuffle an Array
|
Medium
|
|
385
|
Mini Parser
|
Medium
|
|
386
|
Lexicographical Numbers
|
Medium
|
|
388
|
Longest Absolute File Path
|
Medium
|
|
390
|
Elimination Game
|
Medium
|
|
393
|
UTF-8 Validation
|
Medium
|
|
394
|
Decode String
|
Medium
|
|
395
|
Longest Substring with At Least K Repeating Characters
|
Medium
|
|
396
|
Rotate Function
|
Medium
|
|
397
|
Integer Replacement
|
Medium
|
|
398
|
Random Pick Index
|
Medium
|
|
399
|
Evaluate Division
|
Medium
|
|
400
|
Nth Digit
|
Medium
|
|
402
|
Remove K Digits
|
Medium
|
|
406
|
Queue Reconstruction by Height
|
Medium
|
|
413
|
Arithmetic Slices
|
Medium
|
|
416
|
Partition Equal Subset Sum
|
Medium
|
|
417
|
Pacific Atlantic Water Flow
|
Medium
|
|
418
|
Sentence Screen Fitting
|
Medium
|
|
419
|
Battleships in a Board
|
Medium
|
|
421
|
Maximum XOR of Two Numbers in an Array
|
Medium
|
|
423
|
Reconstruct Original Digits from English
|
Medium
|
|
424
|
Longest Repeating Character Replacement
|
Medium
|
|
433
|
Minimum Genetic Mutation
|
Medium
|
|
435
|
Non-overlapping Intervals
|
Medium
|
|
436
|
Find Right Interval
|
Medium
|
|
437
|
Path Sum III
|
Medium
|
|
438
|
Find All Anagrams in a String
|
Medium
|
|
439
|
Ternary Expression Parser
|
Medium
|
|
442
|
Find All Duplicates in an Array
|
Medium
|
|
443
|
String Compression
|
Medium
|
|
444
|
Sequence Reconstruction
|
Medium
|
|
445
|
Add Two Numbers II
|
Medium
|
|
447
|
Number of Boomerangs
|
Medium
|
|
449
|
Serialize and Deserialize BST
|
Medium
|
|
450
|
Delete Node in a BST
|
Medium
|
|
451
|
Sort Characters By Frequency
|
Medium
|
|
452
|
Minimum Number of Arrows to Burst Balloons
|
Medium
|
|
454
|
4Sum II
|
Medium
|
|
456
|
132 Pattern
|
Medium
|
|
457
|
Circular Array Loop
|
Medium
|
|
462
|
Minimum Moves to Equal Array Elements II
|
Medium
|
|
464
|
Can I Win
|
Medium
|
|
467
|
Unique Substrings in Wraparound String
|
Medium
|
|
468
|
Validate IP Address
|
Medium
|
|
469
|
Convex Polygon
|
Medium
|
|
470
|
Implement Rand10() Using Rand7()
|
Medium
|
|
473
|
Matchsticks to Square
|
Medium
|
|
474
|
Ones and Zeroes
|
Medium
|
|
475
|
Heaters
|
Medium
|
|
477
|
Total Hamming Distance
|
Medium
|
|
478
|
Generate Random Point in a Circle
|
Medium
|
|
481
|
Magical String
|
Medium
|
|
484
|
Find Permutation
|
Medium
|
|
486
|
Predict the Winner
|
Medium
|
|
487
|
Max Consecutive Ones II
|
Medium
|
|
490
|
The Maze
|
Medium
|
|
491
|
Increasing Subsequences
|
Medium
|
|
494
|
Target Sum
|
Medium
|
|
495
|
Teemo Attacking
|
Medium
|
|
497
|
Random Point in Non-overlapping Rectangles
|
Medium
|
|
498
|
Diagonal Traverse
|
Medium
|
|
503
|
Next Greater Element II
|
Medium
|
|
505
|
The Maze II
|
Medium
|
|
508
|
Most Frequent Subtree Sum
|
Medium
|
|
513
|
Find Bottom Left Tree Value
|
Medium
|
|
515
|
Find Largest Value in Each Tree Row
|
Medium
|
|
516
|
Longest Palindromic Subsequence
|
Medium
|
|
518
|
Coin Change 2
|
Medium
|
|
519
|
Random Flip Matrix
|
Medium
|
|
522
|
Longest Uncommon Subsequence II
|
Medium
|
|
523
|
Continuous Subarray Sum
|
Medium
|
|
524
|
Longest Word in Dictionary through Deleting
|
Medium
|
|
525
|
Contiguous Array
|
Medium
|
|
526
|
Beautiful Arrangement
|
Medium
|
|
528
|
Random Pick with Weight
|
Medium
|
|
529
|
Minesweeper
|
Medium
|
|
531
|
Lonely Pixel I
|
Medium
|
|
532
|
K-diff Pairs in an Array
|
Medium
|
|
533
|
Lonely Pixel II
|
Medium
|
|
535
|
Encode and Decode TinyURL
|
Medium
|
|
536
|
Construct Binary Tree from String
|
Medium
|
|
537
|
Complex Number Multiplication
|
Medium
|
|
538
|
Convert BST to Greater Tree
|
Medium
|
|
539
|
Minimum Time Difference
|
Medium
|
|
540
|
Single Element in a Sorted Array
|
Medium
|
|
542
|
01 Matrix
|
Medium
|
|
544
|
Output Contest Matches
|
Medium
|
|
545
|
Boundary of Binary Tree
|
Medium
|
|
547
|
Number of Provinces
|
Medium
|
|
548
|
Split Array with Equal Sum
|
Medium
|
|
549
|
Binary Tree Longest Consecutive Sequence II
|
Medium
|
|
553
|
Optimal Division
|
Medium
|
|
554
|
Brick Wall
|
Medium
|
|
555
|
Split Concatenated Strings
|
Medium
|
|
556
|
Next Greater Element III
|
Medium
|
|
560
|
Subarray Sum Equals K
|
Medium
|
|
562
|
Longest Line of Consecutive One in Matrix
|
Medium
|
|
565
|
Array Nesting
|
Medium
|
|
567
|
Permutation in String
|
Medium
|
|
573
|
Squirrel Simulation
|
Medium
|
|
576
|
Out of Boundary Paths
|
Medium
|
|
581
|
Shortest Unsorted Continuous Subarray
|
Medium
|
|
582
|
Kill Process
|
Medium
|
|
583
|
Delete Operation for Two Strings
|
Medium
|
|
592
|
Fraction Addition and Subtraction
|
Medium
|
|
593
|
Valid Square
|
Medium
|
|
609
|
Find Duplicate File in System
|
Medium
|
|
611
|
Valid Triangle Number
|
Medium
|
|
616
|
Add Bold Tag in String
|
Medium
|
|
621
|
Task Scheduler
|
Medium
|
|
622
|
Design Circular Queue
|
Medium
|
|
623
|
Add One Row to Tree
|
Medium
|
|
624
|
Maximum Distance in Arrays
|
Medium
|
|
625
|
Minimum Factorization
|
Medium
|
|
633
|
Sum of Square Numbers
|
Medium
|
|
634
|
Find the Derangement of An Array
|
Medium
|
|
635
|
Design Log Storage System
|
Medium
|
|
636
|
Exclusive Time of Functions
|
Medium
|
|
638
|
Shopping Offers
|
Medium
|
|
640
|
Solve the Equation
|
Medium
|
|
641
|
Design Circular Deque
|
Medium
|
|
646
|
Maximum Length of Pair Chain
|
Medium
|
|
647
|
Palindromic Substrings
|
Medium
|
|
648
|
Replace Words
|
Medium
|
|
649
|
Dota2 Senate
|
Medium
|
|
650
|
2 Keys Keyboard
|
Medium
|
|
651
|
4 Keys Keyboard
|
Medium
|
|
652
|
Find Duplicate Subtrees
|
Medium
|
|
654
|
Maximum Binary Tree
|
Medium
|
|
655
|
Print Binary Tree
|
Medium
|
|
658
|
Find K Closest Elements
|
Medium
|
|
659
|
Split Array into Consecutive Subsequences
|
Medium
|
|
662
|
Maximum Width of Binary Tree
|
Medium
|
|
663
|
Equal Tree Partition
|
Medium
|
|
665
|
Non-decreasing Array
|
Medium
|
|
666
|
Path Sum IV
|
Medium
|
|
667
|
Beautiful Arrangement II
|
Medium
|
|
669
|
Trim a Binary Search Tree
|
Medium
|
|
670
|
Maximum Swap
|
Medium
|
|
672
|
Bulb Switcher II
|
Medium
|
|
673
|
Number of Longest Increasing Subsequence
|
Medium
|
|
676
|
Implement Magic Dictionary
|
Medium
|
|
677
|
Map Sum Pairs
|
Medium
|
|
678
|
Valid Parenthesis String
|
Medium
|
|
681
|
Next Closest Time
|
Medium
|
|
684
|
Redundant Connection
|
Medium
|
|
686
|
Repeated String Match
|
Medium
|
|
687
|
Longest Univalue Path
|
Medium
|
|
688
|
Knight Probability in Chessboard
|
Medium
|
|
692
|
Top K Frequent Words
|
Medium
|
|
694
|
Number of Distinct Islands
|
Medium
|
|
695
|
Max Area of Island
|
Medium
|
|
698
|
Partition to K Equal Sum Subsets
|
Medium
|
|
701
|
Insert into a Binary Search Tree
|
Medium
|
|
707
|
Design Linked List
|
Medium
|
|
712
|
Minimum ASCII Delete Sum for Two Strings
|
Medium
|
|
713
|
Subarray Product Less Than K
|
Medium
|
|
714
|
Best Time to Buy and Sell Stock with Transaction Fee
|
Medium
|
|
718
|
Maximum Length of Repeated Subarray
|
Medium
|
|
721
|
Accounts Merge
|
Medium
|
|
722
|
Remove Comments
|
Medium
|
|
723
|
Candy Crush
|
Medium
|
|
725
|
Split Linked List in Parts
|
Medium
|
|
729
|
My Calendar I
|
Medium
|
|
731
|
My Calendar II
|
Medium
|
|
735
|
Asteroid Collision
|
Medium
|
|
737
|
Sentence Similarity II
|
Medium
|
|
738
|
Monotone Increasing Digits
|
Medium
|
|
739
|
Daily Temperatures
|
Medium
|
|
740
|
Delete and Earn
|
Medium
|
|
742
|
Closest Leaf in a Binary Tree
|
Medium
|
|
743
|
Network Delay Time
|
Medium
|
|
750
|
Number Of Corner Rectangles
|
Medium
|
|
751
|
IP to CIDR
|
Medium
|
|
752
|
Open the Lock
|
Medium
|
|
754
|
Reach a Number
|
Medium
|
|
755
|
Pour Water
|
Medium
|
|
756
|
Pyramid Transition Matrix
|
Medium
|
|
763
|
Partition Labels
|
Medium
|
|
764
|
Largest Plus Sign
|
Medium
|
|
767
|
Reorganize String
|
Medium
|
|
769
|
Max Chunks To Make Sorted
|
Medium
|
|
775
|
Global and Local Inversions
|
Medium
|
|
776
|
Split BST
|
Medium
|
|
777
|
Swap Adjacent in LR String
|
Medium
|
|
779
|
K-th Symbol in Grammar
|
Medium
|
|
781
|
Rabbits in Forest
|
Medium
|
|
784
|
Letter Case Permutation
|
Medium
|
|
785
|
Is Graph Bipartite?
|
Medium
|
|
787
|
Cheapest Flights Within K Stops
|
Medium
|
|
789
|
Escape The Ghosts
|
Medium
|
|
790
|
Domino and Tromino Tiling
|
Medium
|
|
791
|
Custom Sort String
|
Medium
|
|
792
|
Number of Matching Subsequences
|
Medium
|
|
794
|
Valid Tic-Tac-Toe State
|
Medium
|
|
795
|
Number of Subarrays with Bounded Maximum
|
Medium
|
|
797
|
All Paths From Source to Target
|
Medium
|
|
799
|
Champagne Tower
|
Medium
|
|
801
|
Minimum Swaps To Make Sequences Increasing
|
Medium
|
|
802
|
Find Eventual Safe States
|
Medium
|
|
807
|
Max Increase to Keep City Skyline
|
Medium
|
|
808
|
Soup Servings
|
Medium
|
|
809
|
Expressive Words
|
Medium
|
|
813
|
Largest Sum of Averages
|
Medium
|
|
814
|
Binary Tree Pruning
|
Medium
|
|
816
|
Ambiguous Coordinates
|
Medium
|
|
817
|
Linked List Components
|
Medium
|
|
820
|
Short Encoding of Words
|
Medium
|
|
822
|
Card Flipping Game
|
Medium
|
|
823
|
Binary Trees With Factors
|
Medium
|
|
825
|
Friends Of Appropriate Ages
|
Medium
|
|
826
|
Most Profit Assigning Work
|
Medium
|
|
831
|
Masking Personal Information
|
Medium
|
|
833
|
Find And Replace in String
|
Medium
|
|
835
|
Image Overlap
|
Medium
|
|
837
|
New 21 Game
|
Medium
|
|
838
|
Push Dominoes
|
Medium
|
|
840
|
Magic Squares In Grid
|
Medium
|
|
841
|
Keys and Rooms
|
Medium
|
|
842
|
Split Array into Fibonacci Sequence
|
Medium
|
|
845
|
Longest Mountain in Array
|
Medium
|
|
846
|
Hand of Straights
|
Medium
|
|
848
|
Shifting Letters
|
Medium
|
|
849
|
Maximize Distance to Closest Person
|
Medium
|
|
851
|
Loud and Rich
|
Medium
|
|
853
|
Car Fleet
|
Medium
|
|
855
|
Exam Room
|
Medium
|
|
856
|
Score of Parentheses
|
Medium
|
|
858
|
Mirror Reflection
|
Medium
|
|
861
|
Score After Flipping Matrix
|
Medium
|
|
863
|
All Nodes Distance K in Binary Tree
|
Medium
|
|
865
|
Smallest Subtree with all the Deepest Nodes
|
Medium
|
|
866
|
Prime Palindrome
|
Medium
|
|
869
|
Reordered Power of 2
|
Medium
|
|
870
|
Advantage Shuffle
|
Medium
|
|
873
|
Length of Longest Fibonacci Subsequence
|
Medium
|
|
875
|
Koko Eating Bananas
|
Medium
|
|
877
|
Stone Game
|
Medium
|
|
880
|
Decoded String at Index
|
Medium
|
|
881
|
Boats to Save People
|
Medium
|
|
885
|
Spiral Matrix III
|
Medium
|
|
886
|
Possible Bipartition
|
Medium
|
|
889
|
Construct Binary Tree from Preorder and Postorder Traversal
|
Medium
|
|
890
|
Find and Replace Pattern
|
Medium
|
|
894
|
All Possible Full Binary Trees
|
Medium
|
|
898
|
Bitwise ORs of Subarrays
|
Medium
|
|
900
|
RLE Iterator
|
Medium
|
|
901
|
Online Stock Span
|
Medium
|
|
904
|
Fruit Into Baskets
|
Medium
|
|
907
|
Sum of Subarray Minimums
|
Medium
|
|
909
|
Snakes and Ladders
|
Medium
|
|
910
|
Smallest Range II
|
Medium
|
|
911
|
Online Election
|
Medium
|
|
912
|
Sort an Array
|
Medium
|
|
915
|
Partition Array into Disjoint Intervals
|
Medium
|
|
916
|
Word Subsets
|
Medium
|
|
918
|
Maximum Sum Circular Subarray
|
Medium
|
|
919
|
Complete Binary Tree Inserter
|
Medium
|
|
921
|
Minimum Add to Make Parentheses Valid
|
Medium
|
|
923
|
3Sum With Multiplicity
|
Medium
|
|
926
|
Flip String to Monotone Increasing
|
Medium
|
|
930
|
Binary Subarrays With Sum
|
Medium
|
|
931
|
Minimum Falling Path Sum
|
Medium
|
|
932
|
Beautiful Array
|
Medium
|
|
934
|
Shortest Bridge
|
Medium
|
|
935
|
Knight Dialer
|
Medium
|
|
939
|
Minimum Area Rectangle
|
Medium
|
|
945
|
Minimum Increment to Make Array Unique
|
Medium
|
|
946
|
Validate Stack Sequences
|
Medium
|
|
947
|
Most Stones Removed with Same Row or Column
|
Medium
|
|
948
|
Bag of Tokens
|
Medium
|
|
949
|
Largest Time for Given Digits
|
Medium
|
|
950
|
Reveal Cards In Increasing Order
|
Medium
|
|
951
|
Flip Equivalent Binary Trees
|
Medium
|
|
954
|
Array of Doubled Pairs
|
Medium
|
|
955
|
Delete Columns to Make Sorted II
|
Medium
|
|
957
|
Prison Cells After N Days
|
Medium
|
|
958
|
Check Completeness of a Binary Tree
|
Medium
|
|
959
|
Regions Cut By Slashes
|
Medium
|
|
962
|
Maximum Width Ramp
|
Medium
|
|
963
|
Minimum Area Rectangle II
|
Medium
|
|
966
|
Vowel Spellchecker
|
Medium
|
|
967
|
Numbers With Same Consecutive Differences
|
Medium
|
|
969
|
Pancake Sorting
|
Medium
|
|
970
|
Powerful Integers
|
Medium
|
|
971
|
Flip Binary Tree To Match Preorder Traversal
|
Medium
|
|
973
|
K Closest Points to Origin
|
Medium
|
|
974
|
Subarray Sums Divisible by K
|
Medium
|
|
978
|
Longest Turbulent Subarray
|
Medium
|
|
979
|
Distribute Coins in Binary Tree
|
Medium
|
|
981
|
Time Based Key-Value Store
|
Medium
|
|
983
|
Minimum Cost For Tickets
|
Medium
|
|
984
|
String Without AAA or BBB
|
Medium
|
|
986
|
Interval List Intersections
|
Medium
|
|
988
|
Smallest String Starting From Leaf
|
Medium
|
|
990
|
Satisfiability of Equality Equations
|
Medium
|
|
991
|
Broken Calculator
|
Medium
|
|
994
|
Rotting Oranges
|
Medium
|
|
998
|
Maximum Binary Tree II
|
Medium
|
|
1003
|
Check If Word Is Valid After Substitutions
|
Medium
|
|
1004
|
Max Consecutive Ones III
|
Medium
|
|
1006
|
Clumsy Factorial
|
Medium
|
|
1007
|
Minimum Domino Rotations For Equal Row
|
Medium
|
|
1008
|
Construct Binary Search Tree from Preorder Traversal
|
Medium
|
|
1010
|
Pairs of Songs With Total Durations Divisible by 60
|
Medium
|
|
1011
|
Capacity To Ship Packages Within D Days
|
Medium
|
|
1014
|
Best Sightseeing Pair
|
Medium
|
|
1015
|
Smallest Integer Divisible by K
|
Medium
|
|
1016
|
Binary String With Substrings Representing 1 To N
|
Medium
|
|
1017
|
Convert to Base -2
|
Medium
|
|
1019
|
Next Greater Node In Linked List
|
Medium
|
|
1020
|
Number of Enclaves
|
Medium
|
|
1023
|
Camelcase Matching
|
Medium
|
|
1024
|
Video Stitching
|
Medium
|
|
1026
|
Maximum Difference Between Node and Ancestor
|
Medium
|
|
1027
|
Longest Arithmetic Subsequence
|
Medium
|
|
1029
|
Two City Scheduling
|
Medium
|
|
1031
|
Maximum Sum of Two Non-Overlapping Subarrays
|
Medium
|
|
1034
|
Coloring A Border
|
Medium
|
|
1035
|
Uncrossed Lines
|
Medium
|
|
1038
|
Binary Search Tree to Greater Sum Tree
|
Medium
|
|
1039
|
Minimum Score Triangulation of Polygon
|
Medium
|
|
1040
|
Moving Stones Until Consecutive II
|
Medium
|
|
1041
|
Robot Bounded In Circle
|
Medium
|
|
1042
|
Flower Planting With No Adjacent
|
Medium
|
|
1043
|
Partition Array for Maximum Sum
|
Medium
|
|
1048
|
Longest String Chain
|
Medium
|
|
1049
|
Last Stone Weight II
|
Medium
|
|
1052
|
Grumpy Bookstore Owner
|
Medium
|
|
1053
|
Previous Permutation With One Swap
|
Medium
|
|
1054
|
Distant Barcodes
|
Medium
|
|
1055
|
Shortest Way to Form String
|
Medium
|
|
1057
|
Campus Bikes
|
Medium
|
|
1058
|
Minimize Rounding Error to Meet Target
|
Medium
|
|
1059
|
All Paths from Source Lead to Destination
|
Medium
|
|
1060
|
Missing Element in Sorted Array
|
Medium
|
|
1061
|
Lexicographically Smallest Equivalent String
|
Medium
|
|
1062
|
Longest Repeating Substring
|
Medium
|
|
1066
|
Campus Bikes II
|
Medium
|
|
1072
|
Flip Columns For Maximum Number of Equal Rows
|
Medium
|
|
1073
|
Adding Two Negabinary Numbers
|
Medium
|
|
1079
|
Letter Tile Possibilities
|
Medium
|
|
1080
|
Insufficient Nodes in Root to Leaf Paths
|
Medium
|
|
1081
|
Smallest Subsequence of Distinct Characters
|
Medium
|
|
1087
|
Brace Expansion
|
Medium
|
|
1090
|
Largest Values From Labels
|
Medium
|
|
1091
|
Shortest Path in Binary Matrix
|
Medium
|
|
1093
|
Statistics from a Large Sample
|
Medium
|
|
1094
|
Car Pooling
|
Medium
|
|
1100
|
Find K-Length Substrings With No Repeated Characters
|
Medium
|
|
1101
|
The Earliest Moment When Everyone Become Friends
|
Medium
|
|
1102
|
Path With Maximum Minimum Value
|
Medium
|
|
1104
|
Path In Zigzag Labelled Binary Tree
|
Medium
|
|
1105
|
Filling Bookcase Shelves
|
Medium
|
|
1109
|
Corporate Flight Bookings
|
Medium
|
|
1110
|
Delete Nodes And Return Forest
|
Medium
|
|
1111
|
Maximum Nesting Depth of Two Valid Parentheses Strings
|
Medium
|
|
1120
|
Maximum Average Subtree
|
Medium
|
|
1123
|
Lowest Common Ancestor of Deepest Leaves
|
Medium
|
|
1124
|
Longest Well-Performing Interval
|
Medium
|
|
1129
|
Shortest Path with Alternating Colors
|
Medium
|
|
1130
|
Minimum Cost Tree From Leaf Values
|
Medium
|
|
1131
|
Maximum of Absolute Value Expression
|
Medium
|
|
1135
|
Connecting Cities With Minimum Cost
|
Medium
|
|
1136
|
Parallel Courses
|
Medium
|
|
1138
|
Alphabet Board Path
|
Medium
|
|
1139
|
Largest 1-Bordered Square
|
Medium
|
|
1140
|
Stone Game II
|
Medium
|
|
1143
|
Longest Common Subsequence
|
Medium
|
|
1144
|
Decrease Elements To Make Array Zigzag
|
Medium
|
|
1145
|
Binary Tree Coloring Game
|
Medium
|
|
1146
|
Snapshot Array
|
Medium
|
|
1151
|
Minimum Swaps to Group All 1's Together
|
Medium
|
|
1152
|
Analyze User Website Visit Pattern
|
Medium
|
|
1155
|
Number of Dice Rolls With Target Sum
|
Medium
|
|
1156
|
Swap For Longest Repeated Character Substring
|
Medium
|
|
1161
|
Maximum Level Sum of a Binary Tree
|
Medium
|
|
1162
|
As Far from Land as Possible
|
Medium
|
|
1166
|
Design File System
|
Medium
|
|
1167
|
Minimum Cost to Connect Sticks
|
Medium
|
|
1169
|
Invalid Transactions
|
Medium
|
|
1170
|
Compare Strings by Frequency of the Smallest Character
|
Medium
|
|
1171
|
Remove Zero Sum Consecutive Nodes from Linked List
|
Medium
|
|
1177
|
Can Make Palindrome from Substring
|
Medium
|
|
1181
|
Before and After Puzzle
|
Medium
|
|
1182
|
Shortest Distance to Target Color
|
Medium
|
|
1186
|
Maximum Subarray Sum with One Deletion
|
Medium
|
|
1190
|
Reverse Substrings Between Each Pair of Parentheses
|
Medium
|
|
1191
|
K-Concatenation Maximum Sum
|
Medium
|
|
1197
|
Minimum Knight Moves
|
Medium
|
|
1198
|
Find Smallest Common Element in All Rows
|
Medium
|
|
1201
|
Ugly Number III
|
Medium
|
|
1202
|
Smallest String With Swaps
|
Medium
|
|
1208
|
Get Equal Substrings Within Budget
|
Medium
|
|
1209
|
Remove All Adjacent Duplicates in String II
|
Medium
|
|
1214
|
Two Sum BSTs
|
Medium
|
|
1215
|
Stepping Numbers
|
Medium
|
|
1218
|
Longest Arithmetic Subsequence of Given Difference
|
Medium
|
|
1219
|
Path with Maximum Gold
|
Medium
|
|
1222
|
Queens That Can Attack the King
|
Medium
|
|
1227
|
Airplane Seat Assignment Probability
|
Medium
|
|
1229
|
Meeting Scheduler
|
Medium
|
|
1230
|
Toss Strange Coins
|
Medium
|
|
1233
|
Remove Sub-Folders from the Filesystem
|
Medium
|
|
1234
|
Replace the Substring for Balanced String
|
Medium
|
|
1237
|
Find Positive Integer Solution for a Given Equation
|
Medium
|
|
1238
|
Circular Permutation in Binary Representation
|
Medium
|
|
1239
|
Maximum Length of a Concatenated String with Unique Characters
|
Medium
|
|
1244
|
Design A Leaderboard
|
Medium
|
|
1245
|
Tree Diameter
|
Medium
|
|
1247
|
Minimum Swaps to Make Strings Equal
|
Medium
|
|
1248
|
Count Number of Nice Subarrays
|
Medium
|
|
1249
|
Minimum Remove to Make Valid Parentheses
|
Medium
|
|
1253
|
Reconstruct a 2-Row Binary Matrix
|
Medium
|
|
1254
|
Number of Closed Islands
|
Medium
|
|
1256
|
Encode Number
|
Medium
|
|
1257
|
Smallest Common Region
|
Medium
|
|
1258
|
Synonymous Sentences
|
Medium
|
|
1261
|
Find Elements in a Contaminated Binary Tree
|
Medium
|
|
1262
|
Greatest Sum Divisible by Three
|
Medium
|
|
1265
|
Print Immutable Linked List in Reverse
|
Medium
|
|
1267
|
Count Servers that Communicate
|
Medium
|
|
1268
|
Search Suggestions System
|
Medium
|
|
1272
|
Remove Interval
|
Medium
|
|
1273
|
Delete Tree Nodes
|
Medium
|
|
1276
|
Number of Burgers with No Waste of Ingredients
|
Medium
|
|
1277
|
Count Square Submatrices with All Ones
|
Medium
|
|
1282
|
Group the People Given the Group Size They Belong To
|
Medium
|
|
1283
|
Find the Smallest Divisor Given a Threshold
|
Medium
|
|
1286
|
Iterator for Combination
|
Medium
|
|
1288
|
Remove Covered Intervals
|
Medium
|
|
1291
|
Sequential Digits
|
Medium
|
|
1292
|
Maximum Side Length of a Square with Sum Less than or Equal to Threshold
|
Medium
|
|
1296
|
Divide Array in Sets of K Consecutive Numbers
|
Medium
|
|
1297
|
Maximum Number of Occurrences of a Substring
|
Medium
|
|
1300
|
Sum of Mutated Array Closest to Target
|
Medium
|
|
1302
|
Deepest Leaves Sum
|
Medium
|
|
1305
|
All Elements in Two Binary Search Trees
|
Medium
|
|
1306
|
Jump Game III
|
Medium
|
|
1310
|
XOR Queries of a Subarray
|
Medium
|
|
1311
|
Get Watched Videos by Your Friends
|
Medium
|
|
1314
|
Matrix Block Sum
|
Medium
|
|
1315
|
Sum of Nodes with Even-Valued Grandparent
|
Medium
|
|
1318
|
Minimum Flips to Make a OR b Equal to c
|
Medium
|
|
1319
|
Number of Operations to Make Network Connected
|
Medium
|
|
1324
|
Print Words Vertically
|
Medium
|
|
1325
|
Delete Leaves With a Given Value
|
Medium
|
|
1328
|
Break a Palindrome
|
Medium
|
|
1329
|
Sort the Matrix Diagonally
|
Medium
|
|
1333
|
Filter Restaurants by Vegan-Friendly, Price and Distance
|
Medium
|
|
1334
|
Find the City With the Smallest Number of Neighbors at a Threshold Distance
|
Medium
|
|
1338
|
Reduce Array Size to The Half
|
Medium
|
|
1339
|
Maximum Product of Splitted Binary Tree
|
Medium
|
|
1343
|
Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold
|
Medium
|
|
1344
|
Angle Between Hands of a Clock
|
Medium
|
|
1347
|
Minimum Number of Steps to Make Two Strings Anagram
|
Medium
|
|
1348
|
Tweet Counts Per Frequency
|
Medium
|
|
1352
|
Product of the Last K Numbers
|
Medium
|
|
1353
|
Maximum Number of Events That Can Be Attended
|
Medium
|
|
1357
|
Apply Discount Every n Orders
|
Medium
|
|
1358
|
Number of Substrings Containing All Three Characters
|
Medium
|
|
1361
|
Validate Binary Tree Nodes
|
Medium
|
|
1362
|
Closest Divisors
|
Medium
|
|
1366
|
Rank Teams by Votes
|
Medium
|
|
1367
|
Linked List in Binary Tree
|
Medium
|
|
1371
|
Find the Longest Substring Containing Vowels in Even Counts
|
Medium
|
|
1372
|
Longest ZigZag Path in a Binary Tree
|
Medium
|
|
1375
|
Bulb Switcher III
|
Medium
|
|
1376
|
Time Needed to Inform All Employees
|
Medium
|
|
1381
|
Design a Stack With Increment Operation
|
Medium
|
|
1382
|
Balance a Binary Search Tree
|
Medium
|
|
1386
|
Cinema Seat Allocation
|
Medium
|
|
1387
|
Sort Integers by The Power Value
|
Medium
|
|
1390
|
Four Divisors
|
Medium
|
|
1391
|
Check if There is a Valid Path in a Grid
|
Medium
|
|
1395
|
Count Number of Teams
|
Medium
|
|
1396
|
Design Underground System
|
Medium
|
|
1428
|
Leftmost Column with at Least a One
|
Medium
|
|
1533
|
Find the Index of the Large Integer
|
Medium
|
|
1538
|
Guess the Majority in a Hidden Array
|
Medium
|
|
1631
|
Path With Minimum Effort
|
Medium
|
|
1637
|
Widest Vertical Area Between Two Points Containing No Points
|
Medium
|
|
1638
|
Count Substrings That Differ by One Character
|
Medium
|
|
1641
|
Count Sorted Vowel Strings
|
Medium
|
|
1642
|
Furthest Building You Can Reach
|
Medium
|
|
1647
|
Minimum Deletions to Make Character Frequencies Unique
|
Medium
|
|
1648
|
Sell Diminishing-Valued Colored Balls
|
Medium
|
|
1653
|
Minimum Deletions to Make String Balanced
|
Medium
|
|
1654
|
Minimum Jumps to Reach Home
|
Medium
|
|
1657
|
Determine if Two Strings Are Close
|
Medium
|
|
1658
|
Minimum Operations to Reduce X to Zero
|
Medium
|
|
1669
|
Merge In Between Linked Lists
|
Medium
|
|
1670
|
Design Front Middle Back Queue
|
Medium
|
|
1673
|
Find the Most Competitive Subsequence
|
Medium
|
|
1674
|
Minimum Moves to Make Array Complementary
|
Medium
|
|
1679
|
Max Number of K-Sum Pairs
|
Medium
|
|
1680
|
Concatenation of Consecutive Binary Numbers
|
Medium
|
|
1682
|
Longest Palindromic Subsequence II
|
Medium
|
|
1685
|
Sum of Absolute Differences in a Sorted Array
|
Medium
|
|
1686
|
Stone Game VI
|
Medium
|
|
1689
|
Partitioning Into Minimum Number Of Deci-Binary Numbers
|
Medium
|
|
1690
|
Stone Game VII
|
Medium
|
|
1695
|
Maximum Erasure Value
|
Medium
|
|
1696
|
Jump Game VI
|
Medium
|
|
1698
|
Number of Distinct Substrings in a String
|
Medium
|
|
1701
|
Average Waiting Time
|
Medium
|
|
1702
|
Maximum Binary String After Change
|
Medium
|
|
1705
|
Maximum Number of Eaten Apples
|
Medium
|
|
1706
|
Where Will the Ball Fall
|
Medium
|
|
1711
|
Count Good Meals
|
Medium
|
|
1712
|
Ways to Split Array Into Three Subarrays
|
Medium
|
|
1717
|
Maximum Score From Removing Substrings
|
Medium
|
|
1718
|
Construct the Lexicographically Largest Valid Sequence
|
Medium
|
|
1721
|
Swapping Nodes in a Linked List
|
Medium
|
|
1722
|
Minimize Hamming Distance After Swap Operations
|
Medium
|
|
1726
|
Tuple with Same Product
|
Medium
|
|
1730
|
Shortest Path to Get Food
|
Medium
|
|
1733
|
Minimum Number of People to Teach
|
Medium
|
|
1734
|
Decode XORed Permutation
|
Medium
|
|
1737
|
Change Minimum Characters to Satisfy One of Three Conditions
|
Medium
|
|
1738
|
Find Kth Largest XOR Coordinate Value
|
Medium
|
|
1740
|
Find Distance in a Binary Tree
|
Medium
|
|
1746
|
Maximum Subarray Sum After One Operation
|
Medium
|
|
1769
|
Minimum Number of Operations to Move All Balls to Each Box
|
Medium
|
|
1818
|
Minimum Absolute Sum Difference
|
Medium
|
|
1829
|
Maximum XOR for Each Query
|
Medium
|
|
1833
|
Maximum Ice Cream Bars
|
Medium
|
|
1836
|
Remove Duplicates From an Unsorted Linked List
|
Medium
|