LeetCode

LeetCode solutions with JavaScript

LeetCode Algorithms

#	Title	Explanation	Solution	Difficulty
1140	Distant Barcodes			Medium
1139	Previous Permutation With One Swap			Medium
1138	Grumpy Bookstore Owner			Medium
1137	Height Checker			Easy
1130	Last Stone Weight II			Medium
1129	Longest String Chain			Medium
1128	Remove All Adjacent Duplicates In String			Easy
1127	Last Stone Weight			Easy
1122	Longest Duplicate Substring			Hard
1121	Partition Array for Maximum Sum			Medium
1120	Flower Planting With No Adjacent			Easy
1119	Robot Bounded In Circle			Easy
1115	Valid Boomerang			Easy
1114	Binary Search Tree to Greater Sum Tree			Medium
1113	Moving Stones Until Consecutive II			Medium
1111	Minimum Score Triangulation of Polygon			Medium
1106	Escape a Large Maze			Hard
1105	Uncrossed Lines			Medium
1104	Coloring A Border			Medium
1103	Moving Stones Until Consecutive			Easy
1097	Stream of Characters			Hard
1096	Maximum Sum of Two Non-Overlapping Subarrays			Medium
1095	Two City Scheduling			Easy
1094	Matrix Cells in Distance Order			Easy
1093	Recover a Tree From Preorder Traversal			Hard
1092	Maximum Difference Between Node and Ancestor			Medium
1087	Longest Arithmetic Sequence			Medium
1086	Divisor Game			Easy
1081	Video Stitching			Medium
1080	Camelcase Matching			Medium
1079	Sum of Root To Leaf Binary Numbers			Easy
1078	Remove Outermost Parentheses			Easy
1073	Number of Enclaves			Medium
1072	Next Greater Node In Linked List			Medium
1071	Binary Prefix Divisible By 5			Easy
1070	Convert to Base -2			Medium
1065	Binary String With Substrings Representing 1 To N			Medium
1064	Smallest Integer Divisible by K			Medium
1063	Best Sightseeing Pair			Medium
1062	Partition Array Into Three Parts With Equal Sum			Easy
1057	Numbers With Repeated Digits			Hard
1056	Capacity To Ship Packages Within D Days			Medium
1055	Pairs of Songs With Total Durations Divisible by 60			Easy
1054	Complement of Base 10 Integer			Easy
1050	Construct Binary Search Tree from Preorder Traversal			Medium
1049	Minimum Domino Rotations For Equal Row			Medium
1048	Clumsy Factorial			Medium
1047	Maximize Sum Of Array After K Negations			Easy
1046	Max Consecutive Ones III			Medium
1045	Check If Word Is Valid After Substitutions			Medium
1044	Find Common Characters			Easy
1043	Grid Illumination			Hard
1042	Minimum Cost to Merge Stones			Hard
1041	Available Captures for Rook			Easy
1040	Maximum Binary Tree II			Medium
1039	Find the Town Judge			Easy
1038	Number of Squareful Arrays			Hard
1037	Minimum Number of K Consecutive Bit Flips			Hard
1036	Rotting Oranges			Easy
1035	Cousins in Binary Tree			Easy
1034	Subarrays with K Different Integers			Hard
1033	Broken Calculator			Medium
1032	Satisfiability of Equality Equations			Medium
1031	Add to Array-Form of Integer			Easy
1030	Smallest String Starting From Leaf			Medium
1029	Vertical Order Traversal of a Binary Tree			Medium
1028	Interval List Intersections			Medium
1027	Sum of Even Numbers After Queries			Easy
1026	String Without AAA or BBB			Medium
1025	Minimum Cost For Tickets			Medium
1024	Triples with Bitwise AND Equal To Zero			Hard
1023	Time Based Key-Value Store			Medium
1022	Unique Paths III			Hard
1021	Distribute Coins in Binary Tree			Medium
1020	Longest Turbulent Subarray			Medium
1019	Squares of a Sorted Array			Easy
1018	Largest Perimeter Triangle			Easy
1017	Odd Even Jump			Hard
1016	Subarray Sums Divisible by K			Medium
1014	K Closest Points to Origin			Medium
1013	Fibonacci Number			Easy
1012	Equal Rational Numbers			Hard
1011	Flip Binary Tree To Match Preorder Traversal			Medium
1010	Powerful Integers			Easy
1009	Pancake Sorting			Medium
1008	Binary Tree Cameras			Hard
1007	Numbers With Same Consecutive Differences			Medium
1006	Vowel Spellchecker			Medium
1005	Univalued Binary Tree			Easy
1004	Least Operators to Express Number			Hard
1003	Minimum Area Rectangle II			Medium
1002	Maximum Width Ramp			Medium
1001	N-Repeated Element in Size 2N Array			Easy
1000	Delete Columns to Make Sorted III			Hard
999	Regions Cut By Slashes			Medium
998	Check Completeness of a Binary Tree			Medium
994	Prison Cells After N Days			Medium
993	Tallest Billboard			Hard
992	Delete Columns to Make Sorted II			Medium
991	Array of Doubled Pairs			Medium
990	Verifying an Alien Dictionary			Easy
989	Largest Component Size by Common Factor			Hard
988	Flip Equivalent Binary Trees			Medium
987	Reveal Cards In Increasing Order			Medium
986	Largest Time for Given Digits			Easy
985	Bag of Tokens			Medium
984	Most Stones Removed with Same Row or Column			Medium
983	Validate Stack Sequences			Medium
982	Minimum Increment to Make Array Unique			Medium
981	Delete Columns to Make Sorted			Easy
980	Find the Shortest Superstring			Hard
979	DI String Match			Easy
978	Valid Mountain Array			Easy
977	Distinct Subsequences II			Hard
976	Minimum Area Rectangle			Medium
975	Range Sum of BST			Easy
974	Reorder Log Files			Easy
973	Stamping The Sequence			Hard
972	Knight Dialer			Medium
971	Shortest Bridge			Medium
969	Number of Recent Calls			Easy
968	Beautiful Array			Medium
967	Minimum Falling Path Sum			Medium
966	Binary Subarrays With Sum			Medium
965	Unique Email Addresses			Easy
964	Minimize Malware Spread II			Hard
963	Three Equal Parts			Hard
962	Flip String to Monotone Increasing			Medium
961	Long Pressed Name			Easy
960	Minimize Malware Spread			Hard
959	3Sum With Multiplicity			Medium
958	Sort Array By Parity II			Easy
957	Minimum Add to Make Parentheses Valid			Medium
956	Number of Music Playlists			Hard
955	Complete Binary Tree Inserter			Medium
954	Maximum Sum Circular Subarray			Medium
953	Reverse Only Letters			Easy
952	Word Subsets			Medium
951	Partition Array into Disjoint Intervals			Medium
950	X of a Kind in a Deck of Cards			Easy
949	Cat and Mouse			Hard
948	Sort an Array			Medium
947	Online Election			Medium
946	Smallest Range II			Medium
945	Snakes and Ladders			Medium
944	Smallest Range I			Easy
943	Sum of Subarray Minimums			Medium
942	Super Palindromes			Hard
941	Sort Array By Parity			Easy
940	Fruit Into Baskets			Medium
939	Valid Permutations for DI Sequence			Hard
938	Numbers At Most N Given Digit Set			Hard
937	Online Stock Span			Medium
936	RLE Iterator			Medium
935	Orderly Queue			Hard
934	Bitwise ORs of Subarrays			Medium
933	Increasing Order Search Tree			Easy
932	Monotonic Array			Easy
931	Maximum Frequency Stack			Hard
930	All Possible Full Binary Trees			Medium
929	Groups of Special-Equivalent Strings			Easy
928	Surface Area of 3D Shapes			Easy
927	Sum of Subsequence Widths			Hard
926	Find and Replace Pattern			Medium
925	Construct Binary Tree from Preorder and Postorder Traversal			Medium
924	Fair Candy Swap			Easy
923	Super Egg Drop			Hard
922	Possible Bipartition			Medium
921	Spiral Matrix III			Medium
920	Uncommon Words from Two Sentences			Easy
919	Projection Area of 3D Shapes			Easy
918	Reachable Nodes In Subdivided Graph			Hard
917	Boats to Save People			Medium
916	Decoded String at Index			Medium
915	Generate Random Point in a Circle			Medium
914	Random Point in Non-overlapping Rectangles			Medium
913	Random Flip Matrix			Medium
912	Random Pick with Weight			Medium
911	Profitable Schemes			Hard
910	Nth Magical Number			Hard
909	Stone Game			Medium
908	Middle of the Linked List			Easy
907	Koko Eating Bananas			Medium
906	Walking Robot Simulation			Easy
905	Length of Longest Fibonacci Subsequence			Medium
904	Leaf-Similar Trees			Easy
903	Implement Rand10() Using Rand7()			Medium
902	Minimum Number of Refueling Stops			Hard
901	Advantage Shuffle			Medium
900	Reordered Power of 2			Medium
899	Binary Gap			Easy
898	Transpose Matrix			Easy
897	Prime Palindrome			Medium
896	Smallest Subtree with all the Deepest Nodes			Medium
895	Shortest Path to Get All Keys			Hard
894	Random Pick with Blacklist			Hard
893	All Nodes Distance K in Binary Tree			Medium
892	Shortest Subarray with Sum at Least K			Hard
891	Score After Flipping Matrix			Medium
890	Lemonade Change			Easy
889	Buddy Strings			Easy
888	Mirror Reflection			Medium
887	Minimum Cost to Hire K Workers			Hard
886	Score of Parentheses			Medium
885	Exam Room			Medium
884	K-Similar Strings			Hard
883	Car Fleet			Medium
882	Peak Index in a Mountain Array			Easy
881	Loud and Rich			Medium
880	Rectangle Area II			Hard
879	Maximize Distance to Closest Person			Easy
878	Shifting Letters			Medium
877	Shortest Path Visiting All Nodes			Hard
876	Hand of Straights			Medium
875	Longest Mountain in Array			Medium
874	Backspace String Compare			Easy
873	Guess the Word			Hard
872	Split Array into Fibonacci Sequence			Medium
871	Keys and Rooms			Medium
870	Magic Squares In Grid			Easy
869	Similar String Groups			Hard
868	Push Dominoes			Medium
867	New 21 Game			Medium
866	Rectangle Overlap			Easy
865	Robot Room Cleaner			Hard
864	Image Overlap			Medium
863	Sum of Distances in Tree			Hard
862	Find And Replace in String			Medium
861	Flipping an Image			Easy
860	Design Circular Queue			Medium
859	Design Circular Deque			Medium
858	Masking Personal Information			Medium
857	Positions of Large Groups			Easy
856	Consecutive Numbers Sum			Hard
855	Unique Letter String			Hard
854	Making A Large Island			Hard
853	Most Profit Assigning Work			Medium
852	Friends Of Appropriate Ages			Medium
851	Goat Latin			Easy
850	Insert into a Cyclic Sorted List			Medium
843	Binary Trees With Factors			Medium
842	Card Flipping Game			Medium
841	Shortest Distance to a Character			Easy
839	Short Encoding of Words			Medium
838	Design Linked List			Easy
837	Most Common Word			Easy
836	Race Car			Hard
835	Linked List Components			Medium
834	Ambiguous Coordinates			Medium
833	Bus Routes			Hard
832	Binary Tree Pruning			Medium
831	Largest Sum of Averages			Medium
830	Largest Triangle Area			Easy
829	Subdomain Visit Count			Easy
828	Chalkboard XOR Game			Hard
827	Expressive Words			Medium
826	Soup Servings			Medium
825	Max Increase to Keep City Skyline			Medium
824	Number of Lines To Write String			Easy
823	Split Array With Same Average			Hard
822	Unique Morse Code Words			Easy
821	Bricks Falling When Hit			Hard
820	Find Eventual Safe States			Medium
819	Minimum Swaps To Make Sequences Increasing			Medium
818	Similar RGB Color			Easy
817	Design HashMap			Easy
816	Design HashSet			Easy
815	Champagne Tower			Medium
814	Smallest Rotation with Highest Score			Hard
813	All Paths From Source to Target			Medium
812	Rotate String			Easy
811	Number of Subarrays with Bounded Maximum			Medium
810	Valid Tic-Tac-Toe State			Medium
809	Preimage Size of Factorial Zeroes Function			Hard
808	Number of Matching Subsequences			Medium
807	Custom Sort String			Medium
806	Domino and Tromino Tiling			Medium
805	Escape The Ghosts			Medium
804	Rotated Digits			Easy
803	Cheapest Flights Within K Stops			Medium
802	K-th Smallest Prime Fraction			Hard
801	Is Graph Bipartite?			Medium
800	Letter Case Permutation			Easy
799	Minimum Distance Between BST Nodes			Easy
798	Transform to Chessboard			Hard
797	Rabbits in Forest			Medium
796	Reaching Points			Hard
795	K-th Symbol in Grammar			Medium
794	Swim in Rising Water			Hard
793	Swap Adjacent in LR String			Medium
792	Binary Search			Easy
791	Split BST			Medium
790	Global and Local Inversions			Medium
789	Kth Largest Element in a Stream			Easy
788	Minimize Max Distance to Gas Station			Hard
787	Sliding Puzzle			Hard
786	Search in a Sorted Array of Unknown Size			Medium
785	Basic Calculator III			Hard
784	Insert into a Binary Search Tree			Medium
783	Search in a Binary Search Tree			Easy
782	Jewels and Stones			Easy
781	Basic Calculator IV			Hard
780	Max Chunks To Make Sorted			Medium
779	Max Chunks To Make Sorted II			Hard
778	Reorganize String			Medium
777	Toeplitz Matrix			Easy
776	N-ary Tree Postorder Traversal			Easy
775	N-ary Tree Preorder Traversal			Easy
774	Maximum Depth of N-ary Tree			Easy
773	Quad Tree Intersection			Easy
772	Construct Quad Tree			Easy
771	Encode N-ary Tree to Binary Tree			Hard
770	Couples Holding Hands			Hard
769	Largest Plus Sign			Medium
768	Partition Labels			Medium
767	Prime Number of Set Bits in Binary Representation			Easy
766	Flatten a Multilevel Doubly Linked List			Medium
765	Serialize and Deserialize N-ary Tree			Hard
764	N-ary Tree Level Order Traversal			Easy
763	Special Binary String			Hard
762	Find Anagram Mappings			Easy
761	Employee Free Time			Hard
760	Bold Words in String			Easy
759	Set Intersection Size At Least Two			Hard
758	Convert Binary Search Tree to Sorted Doubly Linked List			Medium
757	Pyramid Transition Matrix			Medium
756	Pour Water			Medium
755	Reach a Number			Easy
754	Cracking the Safe			Hard
753	Open the Lock			Medium
752	IP to CIDR			Easy
751	Number Of Corner Rectangles			Medium
750	Contain Virus			Hard
749	Shortest Completing Word			Easy
748	Largest Number At Least Twice of Others			Easy
747	Min Cost Climbing Stairs			Easy
746	Prefix and Suffix Search			Hard
745	Find Smallest Letter Greater Than Target			Easy
744	Network Delay Time			Medium
743	Closest Leaf in a Binary Tree			Medium
742	To Lower Case			Easy
741	Cherry Pickup			Hard
740	Delete and Earn			Medium
739	Daily Temperatures			Medium
738	Monotone Increasing Digits			Medium
737	Sentence Similarity II			Medium
736	Parse Lisp Expression			Hard
735	Asteroid Collision			Medium
734	Sentence Similarity			Easy
733	Flood Fill			Easy
732	My Calendar III			Hard
731	My Calendar II			Medium
730	Count Different Palindromic Subsequences			Hard
729	My Calendar I			Medium
728	Self Dividing Numbers			Easy
727	Minimum Window Subsequence			Hard
726	Number of Atoms			Hard
725	Split Linked List in Parts			Medium
724	Find Pivot Index			Easy
723	Candy Crush			Medium
722	Remove Comments			Medium
721	Accounts Merge			Medium
720	Longest Word in Dictionary			Easy
719	Find K-th Smallest Pair Distance			Hard
718	Maximum Length of Repeated Subarray			Medium
717	1-bit and 2-bit Characters			Easy
716	Max Stack			Easy
715	Range Module			Hard
714	Best Time to Buy and Sell Stock with Transaction Fee			Medium
713	Subarray Product Less Than K			Medium
712	Minimum ASCII Delete Sum for Two Strings			Medium
711	Number of Distinct Islands II			Hard
699	Falling Squares			Hard
698	Partition to K Equal Sum Subsets			Medium
697	Degree of an Array			Easy
696	Count Binary Substrings			Easy
695	Max Area of Island			Medium
694	Number of Distinct Islands			Medium
693	Binary Number with Alternating Bits			Easy
692	Top K Frequent Words			Medium
691	Stickers to Spell Word			Hard
690	Employee Importance			Easy
689	Maximum Sum of 3 Non-Overlapping Subarrays			Hard
688	Knight Probability in Chessboard			Medium
687	Longest Univalue Path			Easy
686	Repeated String Match			Easy
685	Redundant Connection II			Hard
684	Redundant Connection			Medium
683	K Empty Slots			Hard
682	Baseball Game			Easy
681	Next Closest Time			Medium
680	Valid Palindrome II			Easy
679	24 Game			Hard
678	Valid Parenthesis String			Medium
677	Map Sum Pairs			Medium
676	Implement Magic Dictionary			Medium
675	Cut Off Trees for Golf Event			Hard
674	Longest Continuous Increasing Subsequence			Easy
673	Number of Longest Increasing Subsequence			Medium
672	Bulb Switcher II			Medium
671	Second Minimum Node In a Binary Tree			Easy
670	Maximum Swap			Medium
669	Trim a Binary Search Tree			Easy
668	Kth Smallest Number in Multiplication Table			Hard
667	Beautiful Arrangement II			Medium
666	Path Sum IV			Medium
665	Non-decreasing Array			Easy
664	Strange Printer			Hard
663	Equal Tree Partition			Medium
662	Maximum Width of Binary Tree			Medium
661	Image Smoother			Easy
660	Remove 9			Hard
659	Split Array into Consecutive Subsequences			Medium
658	Find K Closest Elements			Medium
657	Robot Return to Origin			Easy
656	Coin Path			Hard
655	Print Binary Tree			Medium
654	Maximum Binary Tree			Medium
653	Two Sum IV - Input is a BST			Easy
652	Find Duplicate Subtrees			Medium
651	4 Keys Keyboard			Medium
650	2 Keys Keyboard			Medium
649	Dota2 Senate			Medium
648	Replace Words			Medium
647	Palindromic Substrings			Medium
646	Maximum Length of Pair Chain			Medium
645	Set Mismatch			Easy
644	Maximum Average Subarray II			Hard
643	Maximum Average Subarray I			Easy
642	Design Search Autocomplete System			Hard
640	Solve the Equation			Medium
639	Decode Ways II			Hard
638	Shopping Offers			Medium
637	Average of Levels in Binary Tree			Easy
636	Exclusive Time of Functions			Medium
635	Design Log Storage System			Medium
634	Find the Derangement of An Array			Medium
633	Sum of Square Numbers			Easy
632	Smallest Range			Hard
631	Design Excel Sum Formula			Hard
630	Course Schedule III			Hard
629	K Inverse Pairs Array			Hard
628	Maximum Product of Three Numbers			Easy
625	Minimum Factorization			Medium
624	Maximum Distance in Arrays			Easy
623	Add One Row to Tree			Medium
621	Task Scheduler			Medium
617	Merge Two Binary Trees			Easy
616	Add Bold Tag in String			Medium
611	Valid Triangle Number			Medium
609	Find Duplicate File in System			Medium
606	Construct String from Binary Tree			Easy
605	Can Place Flowers			Easy
604	Design Compressed String Iterator			Easy
600	Non-negative Integers without Consecutive Ones			Hard
599	Minimum Index Sum of Two Lists			Easy
598	Range Addition II			Easy
594	Longest Harmonious Subsequence			Easy
593	Valid Square			Medium
592	Fraction Addition and Subtraction			Medium
591	Tag Validator			Hard
588	Design In-Memory File System			Hard
587	Erect the Fence			Hard
583	Delete Operation for Two Strings			Medium
582	Kill Process			Medium
581	Shortest Unsorted Continuous Subarray			Easy
576	Out of Boundary Paths			Medium
575	Distribute Candies			Easy
573	Squirrel Simulation			Medium
572	Subtree of Another Tree			Easy
568	Maximum Vacation Days			Hard
567	Permutation in String			Medium
566	Reshape the Matrix			Easy
565	Array Nesting			Medium
564	Find the Closest Palindrome			Hard
563	Binary Tree Tilt			Easy
562	Longest Line of Consecutive One in Matrix			Medium
561	Array Partition I			Easy
560	Subarray Sum Equals K			Medium
557	Reverse Words in a String III			Easy
556	Next Greater Element III			Medium
555	Split Concatenated Strings			Medium
554	Brick Wall			Medium
553	Optimal Division			Medium
552	Student Attendance Record II			Hard
551	Student Attendance Record I			Easy
549	Binary Tree Longest Consecutive Sequence II			Medium
548	Split Array with Equal Sum			Medium
547	Friend Circles			Medium
546	Remove Boxes			Hard
545	Boundary of Binary Tree			Medium
544	Output Contest Matches			Medium
543	Diameter of Binary Tree			Easy
542	01 Matrix			Medium
541	Reverse String II			Easy
540	Single Element in a Sorted Array			Medium
539	Minimum Time Difference			Medium
538	Convert BST to Greater Tree			Easy
537	Complex Number Multiplication			Medium
536	Construct Binary Tree from String			Medium
535	Encode and Decode TinyURL			Medium
533	Lonely Pixel II			Medium
532	K-diff Pairs in an Array			Easy
531	Lonely Pixel I			Medium
530	Minimum Absolute Difference in BST			Easy
529	Minesweeper			Medium
527	Word Abbreviation			Hard
526	Beautiful Arrangement			Medium
525	Contiguous Array			Medium
524	Longest Word in Dictionary through Deleting			Medium
523	Continuous Subarray Sum			Medium
522	Longest Uncommon Subsequence II			Medium
521	Longest Uncommon Subsequence I			Easy
520	Detect Capital			Easy
518	Coin Change 2			Medium
517	Super Washing Machines			Hard
516	Longest Palindromic Subsequence			Medium
515	Find Largest Value in Each Tree Row			Medium
514	Freedom Trail			Hard
513	Find Bottom Left Tree Value			Medium
509	Inorder Successor in BST II			Medium
508	Most Frequent Subtree Sum			Medium
507	Perfect Number			Easy
506	Relative Ranks			Easy
505	The Maze II			Medium
504	Base 7			Easy
503	Next Greater Element II			Medium
502	IPO			Hard
501	Find Mode in Binary Search Tree			Easy
500	Keyboard Row			Easy
499	The Maze III			Hard
498	Diagonal Traverse			Medium
496	Next Greater Element I			Easy
495	Teemo Attacking			Medium
494	Target Sum			Medium
493	Reverse Pairs			Hard
492	Construct the Rectangle			Easy
491	Increasing Subsequences			Medium
490	The Maze			Medium
488	Zuma Game			Hard
487	Max Consecutive Ones II			Medium
486	Predict the Winner			Medium
485	Max Consecutive Ones			Easy
484	Find Permutation			Medium
483	Smallest Good Base			Hard
482	License Key Formatting			Easy
481	Magical String			Medium
480	Sliding Window Median			Hard
479	Largest Palindrome Product			Hard
477	Total Hamming Distance			Medium
476	Number Complement			Easy
475	Heaters			Easy
474	Ones and Zeroes			Medium
473	Matchsticks to Square			Medium
472	Concatenated Words			Hard
471	Encode String with Shortest Length			Hard
469	Convex Polygon			Medium
468	Validate IP Address			Medium
467	Unique Substrings in Wraparound String			Medium
466	Count The Repetitions			Hard
465	Optimal Account Balancing			Hard
464	Can I Win			Medium
463	Island Perimeter			Easy
462	Minimum Moves to Equal Array Elements II			Medium
461	Hamming Distance			Easy
460	LFU Cache			Hard
459	Repeated Substring Pattern			Easy
458	Poor Pigs			Hard
457	Circular Array Loop			Medium
456	132 Pattern			Medium
455	Assign Cookies			Easy
454	4Sum II			Medium
453	Minimum Moves to Equal Array Elements			Easy
452	Minimum Number of Arrows to Burst Balloons			Medium
451	Sort Characters By Frequency			Medium
450	Delete Node in a BST			Medium
449	Serialize and Deserialize BST			Medium
448	Find All Numbers Disappeared in an Array			Easy
447	Number of Boomerangs			Easy
446	Arithmetic Slices II - Subsequence			Hard
445	Add Two Numbers II			Medium
444	Sequence Reconstruction			Medium
443	String Compression			Easy
442	Find All Duplicates in an Array			Medium
441	Arranging Coins			Easy
440	K-th Smallest in Lexicographical Order			Hard
439	Ternary Expression Parser			Medium
438	Find All Anagrams in a String			Easy
437	Path Sum III			Easy
436	Find Right Interval			Medium
435	Non-overlapping Intervals			Medium
434	Number of Segments in a String			Easy
433	Minimum Genetic Mutation			Medium
432	All O`one Data Structure			Hard
425	Word Squares			Hard
424	Longest Repeating Character Replacement			Medium
423	Reconstruct Original Digits from English			Medium
422	Valid Word Square			Easy
421	Maximum XOR of Two Numbers in an Array			Medium
420	Strong Password Checker			Hard
419	Battleships in a Board			Medium
418	Sentence Screen Fitting			Medium
417	Pacific Atlantic Water Flow			Medium
416	Partition Equal Subset Sum			Medium
415	Add Strings			Easy
414	Third Maximum Number		JavaScript	Easy
413	Arithmetic Slices			Medium
412	Fizz Buzz			Easy
411	Minimum Unique Word Abbreviation			Hard
410	Split Array Largest Sum			Hard
409	Longest Palindrome		JavaScript	Easy
408	Valid Word Abbreviation			Easy
407	Trapping Rain Water II			Hard
406	Queue Reconstruction by Height			Medium
405	Convert a Number to Hexadecimal			Easy
404	Sum of Left Leaves		JavaScript	Easy
403	Frog Jump			Hard
402	Remove K Digits			Medium
401	Binary Watch			Easy
400	Nth Digit		JavaScript	Easy
399	Evaluate Division			Medium
398	Random Pick Index			Medium
397	Integer Replacement			Medium
396	Rotate Function			Medium
395	Longest Substring with At Least K Repeating Characters			Medium
394	Decode String			Medium
393	UTF-8 Validation			Medium
392	Is Subsequence			Medium
391	Perfect Rectangle			Hard
390	Elimination Game			Medium
389	Find the Difference		JavaScript	Easy
388	Longest Absolute File Path			Medium
387	First Unique Character in a String		JavaScript	Easy
386	Lexicographical Numbers			Medium
385	Mini Parser			Medium
384	Shuffle an Array			Medium
383	Ransom Note		JavaScript	Easy
382	Linked List Random Node			Medium
381	Insert Delete GetRandom O(1) - Duplicates allowed			Hard
380	Insert Delete GetRandom O(1)			Medium
379	Design Phone Directory			Medium
378	Kth Smallest Element in a Sorted Matrix			Medium
377	Combination Sum IV			Medium
376	Wiggle Subsequence			Medium
375	Guess Number Higher or Lower II			Medium
374	Guess Number Higher or Lower			Easy
373	Find K Pairs with Smallest Sums			Medium
372	Super Pow			Medium
371	Sum of Two Integers		JavaScript	Easy
370	Range Addition			Medium
369	Plus One Linked List			Medium
368	Largest Divisible Subset			Medium
367	Valid Perfect Square		JavaScript	Easy
366	Find Leaves of Binary Tree			Medium
365	Water and Jug Problem			Medium
364	Nested List Weight Sum II			Medium
363	Max Sum of Rectangle No Larger Than K			Hard
362	Design Hit Counter			Medium
361	Bomb Enemy			Medium
360	Sort Transformed Array			Medium
359	Logger Rate Limiter			Easy
358	Rearrange String k Distance Apart			Hard
357	Count Numbers with Unique Digits			Medium
356	Line Reflection			Medium
355	Design Twitter			Medium
354	Russian Doll Envelopes			Hard
353	Design Snake Game			Medium
352	Data Stream as Disjoint Intervals			Hard
351	Android Unlock Patterns			Medium
350	Intersection of Two Arrays II		JavaScript	Easy
349	Intersection of Two Arrays		JavaScript	Easy
348	Design Tic-Tac-Toe			Medium
347	Top K Frequent Elements			Medium
346	Moving Average from Data Stream			Easy
345	Reverse Vowels of a String		JavaScript	Easy
344	Reverse String		JavaScript	Easy
343	Integer Break			Medium
342	Power of Four		JavaScript	Easy
341	Flatten Nested List Iterator			Medium
340	Longest Substring with At Most K Distinct Characters			Hard
339	Nested List Weight Sum			Easy
338	Counting Bits			Medium
337	House Robber III			Medium
336	Palindrome Pairs			Hard
335	Self Crossing			Hard
334	Increasing Triplet Subsequence			Medium
333	Largest BST Subtree			Medium
332	Reconstruct Itinerary			Medium
331	Verify Preorder Serialization of a Binary Tree			Medium
330	Patching Array			Hard
329	Longest Increasing Path in a Matrix			Hard
328	Odd Even Linked List			Medium
327	Count of Range Sum			Hard
326	Power of Three		JavaScript	Easy
325	Maximum Size Subarray Sum Equals k			Medium
324	Wiggle Sort II			Medium
323	Number of Connected Components in an Undirected Graph			Medium
322	Coin Change			Medium
321	Create Maximum Number			Hard
320	Generalized Abbreviation			Medium
319	Bulb Switcher			Medium
318	Maximum Product of Word Lengths			Medium
317	Shortest Distance from All Buildings			Hard
316	Remove Duplicate Letters			Hard
315	Count of Smaller Numbers After Self			Hard
314	Binary Tree Vertical Order Traversal			Medium
313	Super Ugly Number			Medium
312	Burst Balloons			Hard
311	Sparse Matrix Multiplication			Medium
310	Minimum Height Trees			Medium
309	Best Time to Buy and Sell Stock with Cooldown			Medium
308	Range Sum Query 2D - Mutable			Hard
307	Range Sum Query - Mutable			Medium
306	Additive Number			Medium
305	Number of Islands II			Hard
304	Range Sum Query 2D - Immutable			Medium
303	Range Sum Query - Immutable			Easy
302	Smallest Rectangle Enclosing Black Pixels			Hard
301	Remove Invalid Parentheses			Hard
300	Longest Increasing Subsequence			Medium
299	Bulls and Cows			Medium
298	Binary Tree Longest Consecutive Sequence			Medium
297	Serialize and Deserialize Binary Tree			Hard
296	Best Meeting Point			Hard
295	Find Median from Data Stream			Hard
294	Flip Game II			Medium
293	Flip Game			Easy
292	Nim Game		JavaScript	Easy
291	Word Pattern II			Hard
290	Word Pattern		JavaScript	Easy
289	Game of Life			Medium
288	Unique Word Abbreviation			Medium
287	Find the Duplicate Number			Medium
286	Walls and Gates			Medium
285	Inorder Successor in BST			Medium
284	Peeking Iterator			Medium
283	Move Zeroes		JavaScript	Easy
282	Expression Add Operators			Hard
281	Zigzag Iterator			Medium
280	Wiggle Sort			Medium
279	Perfect Squares			Medium
278	First Bad Version		JavaScript	Easy
277	Find the Celebrity			Medium
276	Paint Fence			Easy
275	H-Index II			Medium
274	H-Index			Medium
273	Integer to English Words			Hard
272	Closest Binary Search Tree Value II			Hard
271	Encode and Decode Strings			Medium
270	Closest Binary Search Tree Value			Easy
269	Alien Dictionary			Hard
268	Missing Number		JavaScript	Easy
267	Palindrome Permutation II			Medium
266	Palindrome Permutation			Easy
265	Paint House II			Hard
264	Ugly Number II			Medium
263	Ugly Number		JavaScript	Easy
261	Graph Valid Tree			Medium
260	Single Number III			Medium
259	3Sum Smaller			Medium
258	Add Digits		JavaScript	Easy
257	Binary Tree Paths		JavaScript	Easy
256	Paint House			Easy
255	Verify Preorder Sequence in Binary Search Tree			Medium
254	Factor Combinations			Medium
253	Meeting Rooms II			Medium
252	Meeting Rooms			Easy
251	Flatten 2D Vector			Medium
250	Count Univalue Subtrees			Medium
249	Group Shifted Strings			Medium
248	Strobogrammatic Number III			Hard
247	Strobogrammatic Number II			Medium
246	Strobogrammatic Number			Easy
245	Shortest Word Distance III			Medium
244	Shortest Word Distance II			Medium
243	Shortest Word Distance			Easy
242	Valid Anagram		JavaScript	Easy
241	Different Ways to Add Parentheses			Medium
240	Search a 2D Matrix II			Medium
239	Sliding Window Maximum			Hard
238	Product of Array Except Self			Medium
237	Delete Node in a Linked List		JavaScript	Easy
236	Lowest Common Ancestor of a Binary Tree			Medium
235	Lowest Common Ancestor of a Binary Search Tree		JavaScript	Easy
234	Palindrome Linked List		JavaScript	Easy
233	Number of Digit One			Hard
232	Implement Queue using Stacks		JavaScript	Easy
231	Power of Two		JavaScript	Easy
230	Kth Smallest Element in a BST			Medium
229	Majority Element II			Medium
228	Summary Ranges			Medium
227	Basic Calculator II			Medium
226	Invert Binary Tree		JavaScript	Easy
225	Implement Stack using Queues		JavaScript	Easy
224	Basic Calculator			Hard
223	Rectangle Area			Medium
222	Count Complete Tree Nodes			Medium
221	Maximal Square			Medium
220	Contains Duplicate III			Medium
219	Contains Duplicate II		JavaScript	Easy
218	The Skyline Problem			Hard
217	Contains Duplicate		JavaScript	Easy
216	Combination Sum III			Medium
215	Kth Largest Element in an Array			Medium
214	Shortest Palindrome			Hard
213	House Robber II			Medium
212	Word Search II			Hard
211	Add and Search Word - Data structure design			Medium
210	Course Schedule II			Medium
209	Minimum Size Subarray Sum			Medium
208	Implement Trie (Prefix Tree)			Medium
207	Course Schedule			Medium
206	Reverse Linked List		JavaScript	Easy
205	Isomorphic Strings		JavaScript	Easy
204	Count Primes		JavaScript	Easy
203	Remove Linked List Elements		JavaScript	Easy
202	Happy Number		JavaScript	Easy
201	Bitwise AND of Numbers Range			Medium
200	Number of Islands			Medium
199	Binary Tree Right Side View			Medium
198	House Robber		JavaScript	Easy
191	Number of 1 Bits		JavaScript	Easy
190	Reverse Bits		JavaScript	Easy
189	Rotate Array		JavaScript	Easy
188	Best Time to Buy and Sell Stock IV			Hard
187	Repeated DNA Sequences			Medium
186	Reverse Words in a String II			Medium
179	Largest Number			Medium
174	Dungeon Game			Hard
173	Binary Search Tree Iterator			Medium
172	Factorial Trailing Zeroes		JavaScript	Easy
171	Excel Sheet Column Number		JavaScript	Easy
170	Two Sum III - Data structure design			Easy
169	Majority Element		JavaScript	Easy
168	Excel Sheet Column Title		JavaScript	Easy
167	Two Sum II - Input array is sorted		JavaScript	Easy
166	Fraction to Recurring Decimal			Medium
165	Compare Version Numbers			Medium
164	Maximum Gap			Hard
163	Missing Ranges			Medium
162	Find Peak Element			Medium
161	One Edit Distance			Medium
160	Intersection of Two Linked Lists		JavaScript	Easy
159	Longest Substring with At Most Two Distinct Characters			Hard
158	Read N Characters Given Read4 II - Call multiple times			Hard
157	Read N Characters Given Read4			Easy
156	Binary Tree Upside Down			Medium
155	Min Stack		JavaScript	Easy
154	Find Minimum in Rotated Sorted Array II			Hard
153	Find Minimum in Rotated Sorted Array			Medium
152	Maximum Product Subarray			Medium
151	Reverse Words in a String			Medium
150	Evaluate Reverse Polish Notation			Medium
149	Max Points on a Line			Hard
148	Sort List			Medium
147	Insertion Sort List			Medium
146	LRU Cache			Hard
145	Binary Tree Postorder Traversal			Hard
144	Binary Tree Preorder Traversal			Medium
143	Reorder List			Medium
142	Linked List Cycle II			Medium
141	Linked List Cycle		JavaScript	Easy
140	Word Break II			Hard
139	Word Break			Medium
138	Copy List with Random Pointer			Medium
137	Single Number II			Medium
136	Single Number		JavaScript	Easy
135	Candy			Hard
134	Gas Station			Medium
133	Clone Graph			Medium
132	Palindrome Partitioning II			Hard
131	Palindrome Partitioning			Medium
130	Surrounded Regions			Medium
129	Sum Root to Leaf Numbers			Medium
128	Longest Consecutive Sequence			Hard
127	Word Ladder			Medium
126	Word Ladder II			Hard
125	Valid Palindrome		JavaScript	Easy
124	Binary Tree Maximum Path Sum			Hard
123	Best Time to Buy and Sell Stock III			Hard
122	Best Time to Buy and Sell Stock II		JavaScript	Easy
121	Best Time to Buy and Sell Stock		JavaScript	Easy
120	Triangle			Medium
119	Pascal's Triangle II		JavaScript	Easy
118	Pascal's Triangle		JavaScript	Easy
117	Populating Next Right Pointers in Each Node II			Medium
116	Populating Next Right Pointers in Each Node			Medium
115	Distinct Subsequences			Hard
114	Flatten Binary Tree to Linked List			Medium
113	Path Sum II			Medium
112	Path Sum		JavaScript	Easy
111	Minimum Depth of Binary Tree		JavaScript	Easy
110	Balanced Binary Tree		JavaScript	Easy
109	Convert Sorted List to Binary Search Tree			Medium
108	Convert Sorted Array to Binary Search Tree		JavaScript	Easy
107	Binary Tree Level Order Traversal II		JavaScript	Easy
106	Construct Binary Tree from Inorder and Postorder Traversal			Medium
105	Construct Binary Tree from Preorder and Inorder Traversal			Medium
104	Maximum Depth of Binary Tree		JavaScript	Easy
103	Binary Tree Zigzag Level Order Traversal			Medium
102	Binary Tree Level Order Traversal			Medium
101	Symmetric Tree		JavaScript	Easy
100	Same Tree		JavaScript	Easy
99	Recover Binary Search Tree			Hard
98	Validate Binary Search Tree			Medium
97	Interleaving String			Hard
96	Unique Binary Search Trees			Medium
95	Unique Binary Search Trees II			Medium
94	Binary Tree Inorder Traversal			Medium
93	Restore IP Addresses			Medium
92	Reverse Linked List II			Medium
91	Decode Ways			Medium
90	Subsets II			Medium
89	Gray Code			Medium
88	Merge Sorted Array		JavaScript	Easy
87	Scramble String			Hard
86	Partition List			Medium
85	Maximal Rectangle			Hard
84	Largest Rectangle in Histogram			Hard
83	Remove Duplicates from Sorted List		JavaScript	Easy
82	Remove Duplicates from Sorted List II			Medium
81	Search in Rotated Sorted Array II			Medium
80	Remove Duplicates from Sorted Array II			Medium
79	Word Search			Medium
78	Subsets			Medium
77	Combinations			Medium
76	Minimum Window Substring			Hard
75	Sort Colors			Medium
74	Search a 2D Matrix			Medium
73	Set Matrix Zeroes			Medium
72	Edit Distance			Hard
71	Simplify Path			Medium
70	Climbing Stairs		JavaScript	Easy
69	Sqrt(x)		JavaScript	Easy
68	Text Justification			Hard
67	Add Binary		JavaScript	Easy
66	Plus One		JavaScript	Easy
65	Valid Number			Hard
64	Minimum Path Sum			Medium
63	Unique Paths II			Medium
62	Unique Paths			Medium
61	Rotate List			Medium
60	Permutation Sequence			Medium
59	Spiral Matrix II			Medium
58	Length of Last Word		JavaScript	Easy
57	Insert Interval			Hard
56	Merge Intervals			Medium
55	Jump Game			Medium
54	Spiral Matrix			Medium
53	Maximum Subarray		JavaScript	Easy
52	N-Queens II			Hard
51	N-Queens			Hard
50	Pow(x, n)			Medium
49	Group Anagrams			Medium
48	Rotate Image			Medium
47	Permutations II			Medium
46	Permutations			Medium
45	Jump Game II			Hard
44	Wildcard Matching			Hard
43	Multiply Strings			Medium
42	Trapping Rain Water			Hard
41	First Missing Positive			Hard
40	Combination Sum II			Medium
39	Combination Sum			Medium
38	Count and Say		JavaScript	Easy
37	Sudoku Solver			Hard
36	Valid Sudoku			Medium
35	Search Insert Position		JavaScript	Easy
34	Find First and Last Position of Element in Sorted Array			Medium
33	Search in Rotated Sorted Array			Medium
32	Longest Valid Parentheses			Hard
31	Next Permutation			Medium
30	Substring with Concatenation of All Words			Hard
29	Divide Two Integers			Medium
28	Implement strStr()		JavaScript	Easy
27	Remove Element		JavaScript	Easy
26	Remove Duplicates from Sorted Array		JavaScript	Easy
25	Reverse Nodes in k-Group			Hard
24	Swap Nodes in Pairs			Medium
23	Merge k Sorted Lists			Hard
22	Generate Parentheses			Medium
21	Merge Two Sorted Lists		JavaScript	Easy
20	Valid Parentheses		JavaScript	Easy
19	Remove Nth Node From End of List			Medium
18	4Sum			Medium
17	Letter Combinations of a Phone Number			Medium
16	3Sum Closest			Medium
15	3Sum			Medium
14	Longest Common Prefix		JavaScript	Easy
13	Roman to Integer		JavaScript	Easy
12	Integer to Roman			Medium
11	Container With Most Water			Medium
10	Regular Expression Matching			Hard
9	Palindrome Number		JavaScript	Easy
8	String to Integer (atoi)			Medium
7	Reverse Integer		JavaScript	Easy
6	ZigZag Conversion			Medium
5	Longest Palindromic Substring			Medium
4	Median of Two Sorted Arrays		JavaScript	Hard
3	Longest Substring Without Repeating Characters		JavaScript	Medium
2	Add Two Numbers		JavaScript	Medium
1	Two Sum		JavaScript	Easy