leetcode hard-蒲公英云

Title	Solution	Difficulty	Frequency
4	Median of Two Sorted Arrays	27.2%	Hard
10	Regular Expression Matching	25.6%	Hard
23	Merge k Sorted Lists	35.8%	Hard
25	Reverse Nodes in k-Group	37.7%	Hard
30	Substring with Concatenation of All Words	24.1%	Hard
32	Longest Valid Parentheses	26.2%	Hard
37	Sudoku Solver	38.5%	Hard
41	First Missing Positive	29.6%	Hard
42	Trapping Rain Water	44.4%	Hard
44	Wildcard Matching	23.3%	Hard
45	Jump Game II	28.7%	Hard
51	N-Queens	41.1%	Hard
52	N-Queens II	53.4%	Hard
57	Insert Interval	31.7%	Hard
65	Valid Number	14.3%	Hard
68	Text Justification	24.2%	Hard
72	Edit Distance	39.1%	Hard
76	Minimum Window Substring	31.7%	Hard
84	Largest Rectangle in Histogram	32.1%	Hard
85	Maximal Rectangle	34.4%	Hard
87	Scramble String	32.1%	Hard
97	Interleaving String	28.7%	Hard
99	Recover Binary Search Tree	35.5%	Hard
115	Distinct Subsequences	35.7%	Hard
123	Best Time to Buy and Sell Stock III	34.6%	Hard
124	Binary Tree Maximum Path Sum	30.8%	Hard
126	Word Ladder II	18.7%	Hard
128	Longest Consecutive Sequence	42.5%	Hard
132	Palindrome Partitioning II	28.2%	Hard
135	Candy	29.1%	Hard
140	Word Break II	28.1%	Hard
145	Binary Tree Postorder Traversal	49.9%	Hard
149	Max Points on a Line	16.0%	Hard
154	Find Minimum in Rotated Sorted Array II	39.7%	Hard
158	Read N Characters Given Read4 II - Call multiple times	27.6%	Hard
159	Longest Substring with At Most Two Distinct Characters	47.7%	Hard
164	Maximum Gap	33.2%	Hard
174	Dungeon Game	27.8%	Hard
185	Department Top Three Salaries	27.8%	Hard
188	Best Time to Buy and Sell Stock IV	26.8%	Hard
212	Word Search II	29.8%	Hard
214	Shortest Palindrome	28.1%	Hard
218	The Skyline Problem	32.3%	Hard
224	Basic Calculator	33.7%	Hard
233	Number of Digit One	30.6%	Hard
239	Sliding Window Maximum	39.1%	Hard
248	Strobogrammatic Number III	37.3%	Hard
262	Trips and Users	26.4%	Hard
265	Paint House II	42.2%	Hard
269	Alien Dictionary	32.0%	Hard
272	Closest Binary Search Tree Value II	46.3%	Hard
273	Integer to English Words	24.8%	Hard
282	Expression Add Operators	33.4%	Hard
291	Word Pattern II	41.6%	Hard
295	Find Median from Data Stream	38.2%	Hard
296	Best Meeting Point	55.8%	Hard
297	Serialize and Deserialize Binary Tree	42.3%	Hard
301	Remove Invalid Parentheses	40.1%	Hard
302	Smallest Rectangle Enclosing Black Pixels	49.8%	Hard
305	Number of Islands II	41.3%	Hard
308	Range Sum Query 2D - Mutable	32.9%	Hard
312	Burst Balloons	48.3%	Hard
315	Count of Smaller Numbers After Self	39.0%	Hard
316	Remove Duplicate Letters	33.3%	Hard
317	Shortest Distance from All Buildings	38.8%	Hard
321	Create Maximum Number	25.8%	Hard
327	Count of Range Sum	33.4%	Hard
329	Longest Increasing Path in a Matrix	40.8%	Hard
330	Patching Array	33.6%	Hard
335	Self Crossing	27.2%	Hard
336	Palindrome Pairs	31.7%	Hard
340	Longest Substring with At Most K Distinct Characters	40.8%	Hard
352	Data Stream as Disjoint Intervals	44.2%	Hard
354	Russian Doll Envelopes	34.3%	Hard
358	Rearrange String k Distance Apart	33.4%	Hard
363	Max Sum of Rectangle No Larger Than K	35.6%	Hard
381	Insert Delete GetRandom O(1) - Duplicates allowed	32.5%	Hard
391	Perfect Rectangle	28.6%	Hard
403	Frog Jump	36.9%	Hard
407	Trapping Rain Water II	39.9%	Hard
410	Split Array Largest Sum	42.8%	Hard
411	Minimum Unique Word Abbreviation	35.2%	Hard
420	Strong Password Checker	16.6%	Hard
425	Word Squares	45.2%	Hard
428	Serialize and Deserialize N-ary Tree	55.2%	Hard
431	Encode N-ary Tree to Binary Tree	65.0%	Hard
432	All O`one Data Structure	30.3%	Hard
440	K-th Smallest in Lexicographical Order	27.0%	Hard
446	Arithmetic Slices II - Subsequence	30.9%	Hard
458	Poor Pigs	46.1%	Hard
460	LFU Cache	29.7%	Hard
465	Optimal Account Balancing	43.6%	Hard
466	Count The Repetitions	27.4%	Hard
471	Encode String with Shortest Length	45.6%	Hard
472	Concatenated Words	36.4%	Hard
479	Largest Palindrome Product	27.8%	Hard
480	Sliding Window Median	33.6%	Hard
483	Smallest Good Base	34.3%	Hard
488	Zuma Game	39.7%	Hard
489	Robot Room Cleaner	65.8%	Hard
493	Reverse Pairs	23.5%	Hard
499	The Maze III	38.0%	Hard
502	IPO	38.4%	Hard
514	Freedom Trail	41.0%	Hard
517	Super Washing Machines	37.0%	Hard
527	Word Abbreviation	51.2%	Hard
546	Remove Boxes	38.9%	Hard
552	Student Attendance Record II	33.8%	Hard
564	Find the Closest Palindrome	19.0%	Hard
568	Maximum Vacation Days	38.5%	Hard
569	Median Employee Salary	49.6%	Hard
571	Find Median Given Frequency of Numbers	46.5%	Hard
579	Find Cumulative Salary of an Employee	34.7%	Hard
587	Erect the Fence	34.6%	Hard
588	Design In-Memory File System	41.3%	Hard
591	Tag Validator	33.2%	Hard
600	Non-negative Integers without Consecutive Ones	33.1%	Hard
601	Human Traffic of Stadium	37.3%	Hard
615	Average Salary: Departments VS Company	39.2%	Hard
618	Students Report By Geography	44.3%	Hard
629	K Inverse Pairs Array	29.6%	Hard
630	Course Schedule III	32.4%	Hard
631	Design Excel Sum Formula	29.5%	Hard
632	Smallest Range Covering Elements from K Lists	48.8%	Hard
639	Decode Ways II	25.5%	Hard
642	Design Search Autocomplete System	39.3%	Hard
644	Maximum Average Subarray II	29.5%	Hard
656	Coin Path	27.5%	Hard
660	Remove 9	52.4%	Hard
664	Strange Printer	37.3%	Hard
668	Kth Smallest Number in Multiplication Table	42.8%	Hard
675	Cut Off Trees for Golf Event	31.6%	Hard
679	24 Game	43.6%	Hard
683	K Empty Slots	34.5%	Hard
685	Redundant Connection II	31.1%	Hard
689	Maximum Sum of 3 Non-Overlapping Subarrays	44.3%	Hard
691	Stickers to Spell Word	39.1%	Hard
699	Falling Squares	40.5%	Hard
710	Random Pick with Blacklist	32.0%	Hard
711	Number of Distinct Islands II	47.0%	Hard
715	Range Module	36.2%	Hard
719	Find K-th Smallest Pair Distance	29.8%	Hard
726	Number of Atoms	45.5%	Hard
727	Minimum Window Subsequence	38.2%	Hard
730	Count Different Palindromic Subsequences	39.7%	Hard
732	My Calendar III	56.6%	Hard
736	Parse Lisp Expression	45.1%	Hard
741	Cherry Pickup	30.7%	Hard
745	Prefix and Suffix Search	31.5%	Hard
749	Contain Virus	41.5%	Hard
753	Cracking the Safe	47.6%	Hard
757	Set Intersection Size At Least Two	36.9%	Hard
759	Employee Free Time	62.4%	Hard
761	Special Binary String	52.4%	Hard
765	Couples Holding Hands	52.1%	Hard
768	Max Chunks To Make Sorted II	46.6%	Hard
770	Basic Calculator IV	45.5%	Hard
772	Basic Calculator III	41.9%	Hard
773	Sliding Puzzle	53.9%	Hard
774	Minimize Max Distance to Gas Station	43.0%	Hard
778	Swim in Rising Water	48.7%	Hard
780	Reaching Points	27.7%	Hard
782	Transform to Chessboard	39.5%	Hard
786	K-th Smallest Prime Fraction	40.5%	Hard
793	Preimage Size of Factorial Zeroes Function	39.2%	Hard
798	Smallest Rotation with Highest Score	41.1%	Hard
803	Bricks Falling When Hit	29.1%	Hard
805	Split Array With Same Average	24.8%	Hard
810	Chalkboard XOR Game	45.0%	Hard
815	Bus Routes	40.6%	Hard
818	Race Car	36.0%	Hard
827	Making A Large Island	43.6%	Hard
828	Unique Letter String	41.0%	Hard
829	Consecutive Numbers Sum	34.1%	Hard
834	Sum of Distances in Tree	40.6%	Hard
839	Similar String Groups	35.4%	Hard
843	Guess the Word	44.5%	Hard
847	Shortest Path Visiting All Nodes	48.0%	Hard
850	Rectangle Area II	45.4%	Hard
854	K-Similar Strings	34.7%	Hard
857	Minimum Cost to Hire K Workers	48.2%	Hard
862	Shortest Subarray with Sum at Least K	22.6%	Hard
864	Shortest Path to Get All Keys	37.3%	Hard
871	Minimum Number of Refueling Stops	29.9%	Hard
878	Nth Magical Number	25.9%	Hard
879	Profitable Schemes	37.3%	Hard
882	Reachable Nodes In Subdivided Graph	38.7%	Hard
887	Super Egg Drop	25.1%	Hard
891	Sum of Subsequence Widths	29.7%	Hard
895	Maximum Frequency Stack	57.1%	Hard
899	Orderly Queue	48.1%	Hard
902	Numbers At Most N Given Digit Set	29.0%	Hard
903	Valid Permutations for DI Sequence	45.4%	Hard
906	Super Palindromes	30.6%	Hard
913	Cat and Mouse	29.1%	Hard
920	Number of Music Playlists	43.9%	Hard
924	Minimize Malware Spread	40.7%	Hard
927	Three Equal Parts	30.8%	Hard
928	Minimize Malware Spread II	39.4%	Hard
936	Stamping The Sequence	35.5%	Hard
940	Distinct Subsequences II	40.3%	Hard
943	Find the Shortest Superstring	39.1%	Hard
952	Largest Component Size by Common Factor	26.9%	Hard
956	Tallest Billboard	38.5%	Hard
960	Delete Columns to Make Sorted III	52.8%	Hard
964	Least Operators to Express Number	40.6%	Hard
968	Binary Tree Cameras	35.8%	Hard
972	Equal Rational Numbers	39.9%	Hard
975	Odd Even Jump	46.0%	Hard
980	Unique Paths III	71.3%	Hard
982	Triples with Bitwise AND Equal To Zero	54.5%	Hard
992	Subarrays with K Different Integers	45.1%	Hard
995	Minimum Number of K Consecutive Bit Flips	47.6%	Hard
996	Number of Squareful Arrays	47.7%	Hard
1000	Minimum Cost to Merge Stones	34.8%	Hard
1001	Grid Illumination	34.8%	Hard
1012	Numbers With Repeated Digits	34.9%	Hard
1028	Recover a Tree From Preorder Traversal	69.4%	Hard
1032	Stream of Characters	42.9%	Hard
1036	Escape a Large Maze	35.0%	Hard
1044	Longest Duplicate Substring	22.9%	Hard
1063	Number of Valid Subarrays	72.8%	Hard
1067	Digit Count in Range	37.9%	Hard
1074	Number of Submatrices That Sum to Target	57.9%	Hard
1088	Confusing Number II	36.1%	Hard
1092	Shortest Common Supersequence	48.3%	Hard
1095	Find in Mountain Array	34.3%	Hard
1096	Brace Expansion II	56.7%	Hard
1097	Game Play Analysis V	47.0%	Hard
1106	Parsing A Boolean Expression	57.7%	Hard
1121	Divide Array Into Increasing Sequences	53.6%	Hard
1125	Smallest Sufficient Team	44.5%	Hard
1127	User Purchase Platform	45.4%	Hard
1136	Parallel Courses	60.1%	Hard
1147	Longest Chunked Palindrome Decomposition	57.8%	Hard
1153	String Transforms Into Another String	28.7%	Hard
1157	Online Majority Element In Subarray	32.3%	Hard
1159	Market Analysis II	48.8%	Hard
1163	Last Substring in Lexicographical Order	29.9%	Hard
1168	Optimize Water Distribution in a Village	48.9%	Hard
1172	Dinner Plate Stacks	42.1%	Hard
1178	Number of Valid Words for Each Puzzle	23.7%	Hard