top-freq-hard.org

The first 100

#	Title	Accep	Diff	Solver
4	Median of Two Sorted Arrays	26.6%	Hard*	Frankie
42	Trapping Rain Water	43.6%	Hard*	Frankie
23	Merge k Sorted Lists	35.0%	Hard*	Frankie
273	Integer to English Words	24.5%	Hard*	Frankie
301	Remove Invalid Parentheses	39.6%	Hard*	Frankie
76	Minimum Window Substring	31.2%	Hard*	Akshay
297	Serialize and Deserialize Binary Tree	41.4%	Hard*	Vandana
975	Odd Even Jump	47.2%	Hard*	Akshay
269	Alien Dictionary	31.3%	Hard*	Kiran
336	Palindrome Pairs	31.2%	Hard*	Supreeth
295	Find Median from Data Stream	37.2%	Hard*	Chethana
10	Regular Expression Matching	25.4%	Hard*	Vamshi
224	Basic Calculator	33.1%	Hard*	Diganta
642	Design Search Autocomplete System	38.3%	Hard*	Kiran
924	Minimize Malware Spread	40.2%	Hard*	Frankie
68	Text Justification	23.6%	Hard	Sumit
41	First Missing Positive	29.1%	Hard*	Mukul
85	Maximal Rectangle	33.7%	Hard*	Vendana
72	Edit Distance	38.2%	Hard	Chethana
149	Max Points on a Line	15.9%	Hard*	Frankie
25	Reverse Nodes in k-Group	36.9%	Hard*	Frankie
829	Consecutive Numbers Sum	33.5%	Hard*	Frankie
124	Binary Tree Maximum Path Sum	30.3%	Hard*	Vamshi
410	Split Array Largest Sum	42.5%	Hard*	Diganta
843	Guess the Word	43.8%	Hard*	Frankie
460	LFU Cache	29.1%	Hard*	Bhumir
126	Word Ladder II	18.1%	Hard*	Frankie
489	Robot Room Cleaner	64.9%	Hard	Frankie
45	Jump Game II	28.3%	Hard	Frankie
239	Sliding Window Maximum	38.5%	Hard	Frankie
772	Basic Calculator III	43.1%	Hard	Frankie
158	ReadN Chars Given Read4 II-Call mult times	26.7%	Hard	Frankie
432	All O`one Data Structure	29.8%	Hard*	Prachi
57	Insert Interval	31.4%	Hard	Bhumir
32	Longest Valid Parentheses	25.7%	Hard*	Vamshi
212	Word Search II	29.1%	Hard	Kiran
51	N-Queens	39.9%	Hard	Vamshi
317	Shortest Distance from All Buildings	38.1%	Hard*	Vamshi
428	Serialize and Deserialize N-ary Tree	54.4%	Hard*	Frankie
340	Longest Substring with At Most K Dist Char	40.1%	Hard	Mukul
218	The Skyline Problem	31.9%	Hard*	Diganta
773	Sliding Puzzle	53.1%	Hard*	Akshay
329	Longest Increasing Path in a Matrix	40.3%	Hard	Mukul
741	Cherry Pickup	30.1%	Hard*	Johny
65	Valid Number	14.1%	Hard*	Diganta
44	Wildcard Matching	23.0%	Hard	Frankie
128	Longest Consecutive Sequence	42.0%	Hard	Frankie
759	Employee Free Time	61.6%	Hard*o	Bhumir
465	Optimal Account Balancing	43.0%	Hard	Frankie
312	Burst Balloons	47.6%	Hard*	Frankie
679	24 Game	43.1%	Hard	Frankie
403	Frog Jump	36.4%	Hard	Kiran
97	Interleaving String	28.3%	Hard	Frankie
37	Sudoku Solver	37.5%	Hard*	Bhumir
140	Word Break II	27.6%	Hard	Frankie
753	Cracking the Safe	46.6%	Hard*	Frankie
458	Poor Pigs	45.5%	Hard*	Frankie
296	Best Meeting Point	55.1%	Hard	Frankie
84	Largest Rectangle in Histogram	31.5%	Hard	Frankie
315	Count of Smaller Numbers After Self	38.5%	Hard	Frankie
564	Find the Closest Palindrome	18.9%	Hard	Frankie
282	Expression Add Operators	32.9%	Hard*	Johnny
480	Sliding Window Median	32.9%	Hard	Johnny
992	Subarrays with K Different Integers	45.2%	Hard	Frankie
736	Parse Lisp Expression	44.2%	Hard*	Frankie
316	Remove Duplicate Letters	32.9%	Hard	Frankie
272	Closest Binary Search Tree Value II	45.5%	Hard	Frankie
895	Maximum Frequency Stack	56.6%	Hard	Frankie
591	Tag Validator	33.0%	Hard	Frankie
887	Super Egg Drop	24.9%	Hard	Frankie
407	Trapping Rain Water II	39.4%	Hard	Frankie
588	Design In-Memory File System	40.2%	Hard*	Frankie
440	K-th Smallest in Lexicographical Order	26.7%	Hard	Frankie
135	Candy	28.7%	Hard*	Diganta
493	Reverse Pairs	23.3%	Hard*	Akshay
780	Reaching Points	27.7%	Hard	Akshay
99	Recover Binary Search Tree	35.0%	Hard	Vendana
770	Basic Calculator IV	45.8%	Hard	Frankie
828	Unique Letter String	39.9%	Hard	Akshay
420	Strong Password Checker	17.1%	Hard	Frankie
123	Best Time to Buy and Sell Stock III	34.0%	Hard*	Vamshi
354	Russian Doll Envelopes	34.1%	Hard*	Frankie
30	Substring with Concatenation of All Words	23.8%	Hard	Frankie
727	Minimum Window Subsequence	37.6%	Hard	Vamshi
1032	Stream of Characters	41.3%	Hard	Frankie
943	Find the Shortest Superstring	38.4%	Hard*	Vamshi
132	Palindrome Partitioning II	27.7%	Hard	Vendana
631	Design Excel Sum Formula	29.4%	Hard*	Prachi
214	Shortest Palindrome	27.8%	Hard*	Diganta
352	Data Stream as Disjoint Intervals	43.7%	Hard	Frankie
1000	Minimum Cost to Merge Stones	32.3%	Hard	Akshay
185	Department Top Three Salaries	26.6%	Hard	Akshay
381	Insert Delete GetRandom O(1)-Dupl allowed	32.1%	Hard	Frankie
363	Max Sum of Rectangle No Larger Than K	35.4%	Hard*	Frankie
472	Concatenated Words	35.3%	Hard*	Prachi
862	Shortest Subarray with Sum at Least K	22.3%	Hard*	Frankie
726	Number of Atoms	45.0%	Hard	Frankie
710	Random Pick with Blacklist	31.3%	Hard*	Frankie
857	Minimum Cost to Hire K Workers	47.6%	Hard*	Asif

The next 100

#	Title	Acceptance	Difficulty	Solver
291	Word Pattern II	41.1%	Hard
1001	Grid Illumination	34.7%	Hard
847	Shortest Path Visiting All Nodes	47.3%	Hard
818	Race Car	35.4%	Hard
675	Cut Off Trees for Golf Event	30.8%	Hard
871	Minimum Number of Refueling Stops	29.2%	Hard
730	Count Different Palindromic Subsequences	39.2%	Hard
803	Bricks Falling When Hit	28.9%	Hard
308	Range Sum Query 2D - Mutable	32.3%	Hard
527	Word Abbreviation	50.4%	Hard
1036	Escape a Large Maze	36.2%	Hard
913	Cat and Mouse	28.8%	Hard
683	K Empty Slots	34.3%	Hard
920	Number of Music Playlists	43.9%	Hard
834	Sum of Distances in Tree	39.7%	Hard
552	Student Attendance Record II	33.4%	Hard
632	Smallest Range	48.0%	Hard
689	Maximum Sum of 3 Non-Overlapping Subarrays	44.3%	Hard
159	Longest Substring with At Most Two Distinct Characters	47.3%	Hard
691	Stickers to Spell Word	38.5%	Hard
854	K-Similar Strings	34.0%	Hard
839	Similar String Groups	34.9%	Hard
968	Binary Tree Cameras	35.3%	Hard
425	Word Squares	44.5%	Hard
233	Number of Digit One	30.3%	Hard
765	Couples Holding Hands	51.8%	Hard
188	Best Time to Buy and Sell Stock IV	26.5%	Hard
715	Range Module	35.8%	Hard	Jack
980	Unique Paths III	71.3%	Hard	Mukul
774	Minimize Max Distance to Gas Station	42.2%	Hard
262	Trips and Users	25.5%	Hard
466	Count The Repetitions	27.4%	Hard
265	Paint House II	41.8%	Hard
964	Least Operators to Express Number	40.8%	Hard
488	Zuma Game	39.2%	Hard
936	Stamping The Sequence	36.3%	Hard
960	Delete Columns to Make Sorted III	52.9%	Hard
499	The Maze III	37.5%	Hard
321	Create Maximum Number	25.5%	Hard
174	Dungeon Game	27.4%	Hard
52	N-Queens II	52.5%	Hard
1028	Recover a Tree From Preorder Traversal	70.0%	Hard	Jack
805	Split Array With Same Average	24.5%	Hard
600	Non-negative Integers without Consecutive Ones	32.8%	Hard
248	Strobogrammatic Number III	36.8%	Hard
850	Rectangle Area II	45.1%	Hard
928	Minimize Malware Spread II	39.5%	Hard
995	Minimum Number of K Consecutive Bit Flips	48.2%	Hard
87	Scramble String	31.8%	Hard
431	Encode N-ary Tree to Binary Tree	64.3%	Hard
302	Smallest Rectangle Enclosing Black Pixels	49.4%	Hard
778	Swim in Rising Water	48.0%	Hard
719	Find K-th Smallest Pair Distance	29.3%	Hard
145	Binary Tree Postorder Traversal	49.0%	Hard
471	Encode String with Shortest Length	45.3%	Hard
154	Find Minimum in Rotated Sorted Array II	39.5%	Hard
1012	Numbers With Repeated Digits	34.9%	Hard
685	Redundant Connection II	30.9%	Hard
927	Three Equal Parts	30.5%	Hard
630	Course Schedule III	31.9%	Hard
115	Distinct Subsequences	35.3%	Hard
972	Equal Rational Numbers	40.2%	Hard
305	Number of Islands II	41.7%	Hard
568	Maximum Vacation Days	38.3%	Hard	Bhumir
996	Number of Squareful Arrays	47.6%	Hard
815	Bus Routes	40.4%	Hard
164	Maximum Gap	32.8%	Hard
335	Self Crossing	27.1%	Hard
761	Special Binary String	52.0%	Hard
798	Smallest Rotation with Highest Score	40.4%	Hard
1044	Longest Duplicate Substring	22.7%	Hard
786	K-th Smallest Prime Fraction	40.0%	Hard
903	Valid Permutations for DI Sequence	44.9%	Hard
330	Patching Array	33.4%	Hard
906	Super Palindromes	30.3%	Hard
827	Making A Large Island	43.4%	Hard
1096	Brace Expansion II	52.5%	Hard
768	Max Chunks To Make Sorted II	46.2%	Hard
864	Shortest Path to Get All Keys	36.3%	Hard
982	Triples with Bitwise AND Equal To Zero	54.1%	Hard
956	Tallest Billboard	38.5%	Hard
902	Numbers At Most N Given Digit Set	28.7%	Hard
639	Decode Ways II	25.3%	Hard
878	Nth Magical Number	25.6%	Hard
940	Distinct Subsequences II	39.9%	Hard
327	Count of Range Sum	33.0%	Hard
391	Perfect Rectangle	28.3%	Hard
745	Prefix and Suffix Search	31.0%	Hard
668	Kth Smallest Number in Multiplication Table	42.2%	Hard
358	Rearrange String k Distance Apart	33.0%	Hard
732	My Calendar III	55.4%	Hard
502	IPO	38.1%	Hard
1074	Number of Submatrices That Sum to Target	58.9%	Hard
1106	Parsing A Boolean Expression	59.3%	Hard	Jack
1097	Game Play Analysis V	45.0%	Hard
1095	Find in Mountain Array	33.0%	Hard
1092	Shortest Common Supersequence	47.7%	Hard
1088	Confusing Number II	34.4%	Hard
1067	Digit Count in Range	35.7%	Hard
1063	Number of Valid Subarrays	74.4%	Hard
952	Largest Component Size by Common Factor	26.5%	Hard
899	Orderly Queue	47.6%	Hard
891	Sum of Subsequence Widths	29.2%	Hard
882	Reachable Nodes In Subdivided Graph	38.2%	Hard
879	Profitable Schemes	36.9%	Hard
810	Chalkboard XOR Game	45.0%	Hard
793	Preimage Size of Factorial Zeroes Function	39.1%	Hard
782	Transform to Chessboard	39.9%	Hard
757	Set Intersection Size At Least Two	37.0%	Hard
749	Contain Virus	41.2%	Hard
711	Number of Distinct Islands II	46.3%	Hard
699	Falling Squares	40.1%	Hard
664	Strange Printer	37.0%	Hard
660	Remove 9	51.6%	Hard
656	Coin Path	27.0%	Hard
644	Maximum Average Subarray II	28.8%	Hard
629	K Inverse Pairs Array	29.4%	Hard
618	Students Report By Geography	43.2%	Hard
615	Average Salary: Departments VS Company	38.2%	Hard
601	Human Traffic of Stadium	36.7%	Hard
587	Erect the Fence	34.4%	Hard
579	Find Cumulative Salary of an Employee	34.3%	Hard
571	Find Median Given Frequency of Numbers	46.9%	Hard
569	Median Employee Salary	47.8%	Hard
546	Remove Boxes	38.5%	Hard
517	Super Washing Machines	37.0%	Hard
514	Freedom Trail	40.8%	Hard
483	Smallest Good Base	34.3%	Hard
479	Largest Palindrome Product	27.5%	Hard
446	Arithmetic Slices II - Subsequence	30.4%	Hard
411	Minimum Unique Word Abbreviation	35.1%	Hard

(fset
 'join1
 (lambda (&optional arg) "Keyboard macro."  (interactive "p")
   (kmacro-exec-ring-item
    (quote
     ([
       106 48 105 124 32 escape 65 124 32 74 backspace escape
       74 102 37 66 105 124 32 escape 87 87 105 124 32 escape
       65 124 113 backspace escape
       ] 0 "%d")) arg)))

These are the top google questions from past 6 months

#	Title	Accpt	Diff
1	Two Sum	44.4%	Easy
410	Split Array Largest Sum	42.8%	Hard
975	Odd Even Jump	46.3%	Hard
1057	Campus Bikes	58.4%	Medium
222	Count Complete Tree Nodes	35.8%	Medium
843	Guess the Word	44.4%	Hard
753	Cracking the Safe	47.5%	Hard
947	Most Stones Removed with Same Row or Column	54.4%	Medium
929	Unique Email Addresses	69.4%	Easy
482	License Key Formatting	41.3%	Easy
489	Robot Room Cleaner	65.7%	Hard
913	Cat and Mouse	29.1%	Hard
1066	Campus Bikes II	49.6%	Medium
844	Backspace String Compare	46.5%	Easy
1096	Brace Expansion II	55.8%	Hard
359	Logger Rate Limiter	66.1%	Easy
4	Median of Two Sorted Arrays	27.1%	Hard
158	Read N Characters Given Read4 II - Call multiple times	27.4%	Hard
833	Find And Replace in String	47.3%	Medium
200	Number of Islands	42.5%	Medium
2	Add Two Numbers	31.6%	Medium
809	Expressive Words	44.2%	Medium
524	Longest Word in Dictionary through Deleting	46.4%	Medium
1007	Minimum Domino Rotations For Equal Row	48.9%	Medium
353	Design Snake Game	31.2%	Medium
1055	Shortest Way to Form String	58.7%	Medium
818	Race Car	35.8%	Hard
56	Merge Intervals	36.3%	Medium
163	Missing Ranges	23.4%	Medium
963	Minimum Area Rectangle II	46.4%	Medium
1011	Capacity To Ship Packages Within D Days	53.8%	Medium
399	Evaluate Division	48.3%	Medium
939	Minimum Area Rectangle	51.1%	Medium
247	Strobogrammatic Number II	45.1%	Medium
731	My Calendar II	45.6%	Medium
246	Strobogrammatic Number	42.8%	Easy
642	Design Search Autocomplete System	39.1%	Hard
253	Meeting Rooms II	43.4%	Medium
299	Bulls and Cows	40.2%	Easy
465	Optimal Account Balancing	43.4%	Hard
57	Insert Interval	31.6%	Hard
1032	Stream of Characters	42.4%	Hard
857	Minimum Cost to Hire K Workers	48.1%	Hard
1087	Brace Expansion	59.4%	Medium
943	Find the Shortest Superstring	38.6%	Hard
241	Different Ways to Add Parentheses	51.1%	Medium
15	3Sum	24.6%	Medium
42	Trapping Rain Water	44.2%	Hard
900	RLE Iterator	50.8%	Medium
981	Time Based Key-Value Store	51.4%	Medium
743	Network Delay Time	43.3%	Medium
248	Strobogrammatic Number III	37.2%	Hard
351	Android Unlock Patterns	46.5%	Medium
679	24 Game	43.5%	Hard
837	New 21 Game	32.2%	Medium
904	Fruit Into Baskets	41.8%	Medium
334	Increasing Triplet Subsequence	39.5%	Medium
315	Count of Smaller Numbers After Self	38.9%	Hard
394	Decode String	45.9%	Medium
354	Russian Doll Envelopes	34.3%	Hard
771	Jewels and Stones	83.5%	Easy
124	Binary Tree Maximum Path Sum	30.7%	Hard
710	Random Pick with Blacklist	32.0%	Hard
788	Rotated Digits	55.0%	Easy
329	Longest Increasing Path in a Matrix	40.7%	Hard
660	Remove 9	52.2%	Hard
767	Reorganize String	43.5%	Medium
425	Word Squares	45.1%	Hard
734	Sentence Similarity	40.9%	Easy
205	Isomorphic Strings	37.9%	Easy
708	Insert into a Cyclic Sorted List	29.8%	Medium
388	Longest Absolute File Path	39.5%	Medium
727	Minimum Window Subsequence	38.0%	Hard
375	Guess Number Higher or Lower II	38.3%	Medium
736	Parse Lisp Expression	44.8%	Hard
616	Add Bold Tag in String	39.8%	Medium
308	Range Sum Query 2D - Mutable	32.8%	Hard
777	Swap Adjacent in LR String	33.6%	Medium
304	Range Sum Query 2D - Immutable	33.5%	Medium
288	Unique Word Abbreviation	20.4%	Medium
3	Longest Substring Without Repeating Characters	28.7%	Medium
846	Hand of Straights	49.8%	Medium
774	Minimize Max Distance to Gas Station	42.8%	Hard
987	Vertical Order Traversal of a Binary Tree	32.1%	Medium
218	The Skyline Problem	32.2%	Hard
840	Magic Squares In Grid	36.0%	Easy
853	Car Fleet	40.4%	Medium
34	Find First and Last Position of Element in Sorted Array	34.0%	Medium
911	Online Election	47.8%	Medium
1048	Longest String Chain	49.0%	Medium
458	Poor Pigs	46.0%	Hard
527	Word Abbreviation	51.1%	Hard
346	Moving Average from Data Stream	67.1%	Easy
128	Longest Consecutive Sequence	42.4%	Hard
10	Regular Expression Matching	25.6%	Hard
973	K Closest Points to Origin	61.5%	Medium
271	Encode and Decode Strings	27.5%	Medium
855	Exam Room	39.2%	Medium
5	Longest Palindromic Substring	27.8%	Medium
146	LRU Cache	26.8%	Medium
1036	Escape a Large Maze	35.2%	Hard
686	Repeated String Match	31.6%	Easy
552	Student Attendance Record II	33.7%	Hard
340	Longest Substring with At Most K Distinct Characters	40.6%	Hard
393	UTF-8 Validation	36.3%	Medium
685	Redundant Connection II	31.0%	Hard
366	Find Leaves of Binary Tree	66.9%	Medium
44	Wildcard Matching	23.2%	Hard
621	Task Scheduler	46.1%	Medium
159	Longest Substring with At Most Two Distinct Characters	47.6%	Hard
497	Random Point in Non-overlapping Rectangles	36.0%	Medium
1110	Delete Nodes And Return Forest	63.1%	Medium
544	Output Contest Matches	73.8%	Medium
428	Serialize and Deserialize N-ary Tree	55.0%	Hard
871	Minimum Number of Refueling Stops	29.8%	Hard
298	Binary Tree Longest Consecutive Sequence	44.6%	Medium
221	Maximal Square	33.8%	Medium
137	Single Number II	46.8%	Medium
528	Random Pick with Weight	43.0%	Medium
85	Maximal Rectangle	34.2%	Hard
155	Min Stack	38.3%	Easy
277	Find the Celebrity	37.8%	Medium
490	The Maze	48.3%	Medium
280	Wiggle Sort	61.5%	Medium
297	Serialize and Deserialize Binary Tree	42.1%	Hard
941	Valid Mountain Array	35.4%	Easy
208	Implement Trie (Prefix Tree)	39.9%	Medium
139	Word Break	36.2%	Medium
839	Similar String Groups	35.3%	Hard
55	Jump Game	32.4%	Medium
363	Max Sum of Rectangle No Larger Than K	35.5%	Hard
117	Populating Next Right Pointers in Each Node II	35.2%	Medium
742	Closest Leaf in a Binary Tree	40.1%	Medium
1047	Remove All Adjacent Duplicates In String	63.8%	Easy
317	Shortest Distance from All Buildings	38.6%	Hard
76	Minimum Window Substring	31.6%	Hard
609	Find Duplicate File in System	56.1%	Medium
403	Frog Jump	36.8%	Hard
406	Queue Reconstruction by Height	60.6%	Medium
133	Clone Graph	27.8%	Medium
149	Max Points on a Line	16.0%	Hard
1091	Shortest Path in Binary Matrix	36.5%	Medium
31	Next Permutation	30.9%	Medium
150	Evaluate Reverse Polish Notation	33.0%	Medium
551	Student Attendance Record I	45.5%	Easy
951	Flip Equivalent Binary Trees	64.8%	Medium
261	Graph Valid Tree	40.3%	Medium
210	Course Schedule II	35.9%	Medium
380	Insert Delete GetRandom O(1)	43.5%	Medium
157	Read N Characters Given Read4	30.3%	Easy
498	Diagonal Traverse	45.7%	Medium
148	Sort List	36.7%	Medium
238	Product of Array Except Self	56.1%	Medium
126	Word Ladder II	18.5%	Hard
132	Palindrome Partitioning II	28.1%	Hard
821	Shortest Distance to a Character	64.0%	Easy
737	Sentence Similarity II	43.9%	Medium
714	Best Time to Buy and Sell Stock with Transaction Fee	51.2%	Medium
977	Squares of a Sorted Array	71.8%	Easy
659	Split Array into Consecutive Subsequences	41.2%	Medium
385	Mini Parser	32.3%	Medium
773	Sliding Puzzle	53.6%	Hard
281	Zigzag Iterator	56.4%	Medium
438	Find All Anagrams in a String	38.0%	Medium
849	Maximize Distance to Closest Person	41.4%	Easy
979	Distribute Coins in Binary Tree	67.7%	Medium
702	Search in a Sorted Array of Unknown Size	60.6%	Medium
11	Container With Most Water	46.1%	Medium
215	Kth Largest Element in an Array	49.3%	Medium
53	Maximum Subarray	44.3%	Easy
101	Symmetric Tree	44.1%	Easy
347	Top K Frequent Elements	56.1%	Medium
296	Best Meeting Point	55.7%	Hard
1024	Video Stitching	47.0%	Medium
386	Lexicographical Numbers	47.4%	Medium
332	Reconstruct Itinerary	32.3%	Medium
459	Repeated Substring Pattern	40.4%	Easy
212	Word Search II	29.6%	Hard
243	Shortest Word Distance	58.1%	Easy
300	Longest Increasing Subsequence	41.2%	Medium
681	Next Closest Time	43.0%	Medium
185	Department Top Three Salaries	27.5%	Hard
379	Design Phone Directory	42.7%	Medium
175	Combine Two Tables	53.6%	Easy
344	Reverse String	63.8%	Easy
130	Surrounded Regions	23.6%	Medium
766	Toeplitz Matrix	62.4%	Easy
22	Generate Parentheses	56.5%	Medium
392	Is Subsequence	47.4%	Easy
802	Find Eventual Safe States	44.9%	Medium
535	Encode and Decode TinyURL	77.4%	Medium
17	Letter Combinations of a Phone Number	42.6%	Medium
156	Binary Tree Upside Down	51.8%	Medium
66	Plus One	41.6%	Easy
992	Subarrays with K Different Integers	44.9%	Hard
505	The Maze II	44.9%	Medium
480	Sliding Window Median	33.4%	Hard
30	Substring with Concatenation of All Words	24.0%	Hard
28	Implement strStr()	32.7%	Easy
269	Alien Dictionary	31.9%	Hard
127	Word Ladder	25.1%	Medium
518	Coin Change 2	43.7%	Medium
997	Find the Town Judge	49.5%	Easy
980	Unique Paths III	71.2%	Hard
171	Excel Sheet Column Number	52.1%	Easy
382	Linked List Random Node	49.8%	Medium
188	Best Time to Buy and Sell Stock IV	26.7%	Hard
935	Knight Dialer	41.8%	Medium
72	Edit Distance	39.0%	Hard
486	Predict the Winner	47.0%	Medium
54	Spiral Matrix	31.1%	Medium
252	Meeting Rooms	52.6%	Easy
239	Sliding Window Maximum	39.0%	Hard
540	Single Element in a Sorted Array	57.5%	Medium
26	Remove Duplicates from Sorted Array	41.6%	Easy
852	Peak Index in a Mountain Array	70.0%	Easy
448	Find All Numbers Disappeared in an Array	54.0%	Easy
284	Peeking Iterator	41.5%	Medium
309	Best Time to Buy and Sell Stock with Cooldown	44.6%	Medium
20	Valid Parentheses	37.1%	Easy
43	Multiply Strings	31.3%	Medium
51	N-Queens	40.8%	Hard
79	Word Search	32.1%	Medium
168	Excel Sheet Column Title	29.4%	Easy
167	Two Sum II - Input array is sorted	51.1%	Easy
250	Count Univalue Subtrees	49.8%	Medium
206	Reverse Linked List	56.3%	Easy
378	Kth Smallest Element in a Sorted Matrix	50.4%	Medium
140	Word Break II	28.0%	Hard
417	Pacific Atlantic Water Flow	38.1%	Medium
724	Find Pivot Index	41.7%	Easy
636	Exclusive Time of Functions	49.2%	Medium
690	Employee Importance	54.7%	Easy
529	Minesweeper	54.0%	Medium
345	Reverse Vowels of a String	42.0%	Easy
543	Diameter of Binary Tree	47.3%	Easy
316	Remove Duplicate Letters	33.2%	Hard
21	Merge Two Sorted Lists	48.5%	Easy
201	Bitwise AND of Numbers Range	36.4%	Medium
7	Reverse Integer	25.5%	Easy
23	Merge k Sorted Lists	35.6%	Hard
343	Integer Break	48.4%	Medium
986	Interval List Intersections	63.8%	Medium
622	Design Circular Queue	40.4%	Medium
994	Rotting Oranges	46.4%	Easy
274	H-Index	34.8%	Medium
692	Top K Frequent Words	46.7%	Medium
289	Game of Life	47.1%	Medium
68	Text Justification	24.0%	Hard
310	Minimum Height Trees	30.6%	Medium
144	Binary Tree Preorder Traversal	52.3%	Medium
152	Maximum Product Subarray	29.8%	Medium
187	Repeated DNA Sequences	36.7%	Medium
84	Largest Rectangle in Histogram	32.0%	Hard
1145	Binary Tree Coloring Game	46.0%	Medium
350	Intersection of Two Arrays II	48.7%	Easy
295	Find Median from Data Stream	38.0%	Hard
704	Binary Search	48.9%	Easy
662	Maximum Width of Binary Tree	39.5%	Medium
33	Search in Rotated Sorted Array	33.1%	Medium
48	Rotate Image	50.0%	Medium
739	Daily Temperatures	60.4%	Medium
121	Best Time to Buy and Sell Stock	48.0%	Easy
94	Binary Tree Inorder Traversal	58.0%	Medium
279	Perfect Squares	42.8%	Medium
747	Largest Number At Least Twice of Others	40.8%	Easy
116	Populating Next Right Pointers in Each Node	38.9%	Medium
45	Jump Game II	28.6%	Hard
1021	Remove Outermost Parentheses	75.1%	Easy
836	Rectangle Overlap	47.0%	Easy
98	Validate Binary Search Tree	26.1%	Medium
97	Interleaving String	28.6%	Hard
688	Knight Probability in Chessboard	45.3%	Medium
322	Coin Change	31.5%	Medium
62	Unique Paths	48.7%	Medium
166	Fraction to Recurring Decimal	19.8%	Medium
63	Unique Paths II	33.6%	Medium
69	Sqrt(x)	31.9%	Easy
542	01 Matrix	36.5%	Medium
162	Find Peak Element	41.7%	Medium
523	Continuous Subarray Sum	24.2%	Medium
65	Valid Number	14.2%	Hard
37	Sudoku Solver	38.3%	Hard
49	Group Anagrams	48.6%	Medium
451	Sort Characters By Frequency	56.9%	Medium
942	DI String Match	69.9%	Easy
138	Copy List with Random Pointer	28.3%	Medium
374	Guess Number Higher or Lower	40.1%	Easy
287	Find the Duplicate Number	50.7%	Medium
811	Subdomain Visit Count	66.3%	Easy
442	Find All Duplicates in an Array	62.0%	Medium
581	Shortest Unsorted Continuous Subarray	30.4%	Easy
229	Majority Element II	32.8%	Medium
16	3Sum Closest	45.8%	Medium
278	First Bad Version	30.9%	Easy
572	Subtree of Another Tree	42.0%	Easy
19	Remove Nth Node From End of List	34.5%	Medium
224	Basic Calculator	33.6%	Hard
785	Is Graph Bipartite?	44.3%	Medium
560	Subarray Sum Equals K	42.7%	Medium
367	Valid Perfect Square	40.3%	Easy
404	Sum of Left Leaves	49.5%	Easy
177	Nth Highest Salary	27.3%	Medium
103	Binary Tree Zigzag Level Order Traversal	42.8%	Medium
131	Palindrome Partitioning	42.2%	Medium
109	Convert Sorted List to Binary Search Tree	42.0%	Medium
213	House Robber II	35.5%	Medium
6	ZigZag Conversion	32.9%	Medium
226	Invert Binary Tree	59.2%	Easy
207	Course Schedule	38.8%	Medium
81	Search in Rotated Sorted Array II	32.7%	Medium
268	Missing Number	49.0%	Easy
75	Sort Colors	43.0%	Medium
371	Sum of Two Integers	50.8%	Easy
965	Univalued Binary Tree	66.9%	Easy
665	Non-decreasing Array	19.5%	Easy
234	Palindrome Linked List	36.8%	Easy
24	Swap Nodes in Pairs	45.9%	Medium
559	Maximum Depth of N-ary Tree	66.0%	Easy
415	Add Strings	44.3%	Easy
50	Pow(x, n)	28.4%	Medium
104	Maximum Depth of Binary Tree	61.7%	Easy
231	Power of Two	42.2%	Easy
100	Same Tree	50.5%	Easy
78	Subsets	54.4%	Medium
77	Combinations	49.2%	Medium
242	Valid Anagram	53.2%	Easy
387	First Unique Character in a String	50.5%	Easy
328	Odd Even Linked List	50.1%	Medium
122	Best Time to Buy and Sell Stock II	52.8%	Easy
173	Binary Search Tree Iterator	49.9%	Medium
35	Search Insert Position	41.1%	Easy
18	4Sum	31.3%	Medium
191	Number of 1 Bits	44.4%	Easy
240	Search a 2D Matrix II	41.2%	Medium
40	Combination Sum II	43.0%	Medium
283	Move Zeroes	54.9%	Easy
203	Remove Linked List Elements	36.3%	Easy
32	Longest Valid Parentheses	26.1%	Hard
41	First Missing Positive	29.5%	Hard
199	Binary Tree Right Side View	49.0%	Medium
105	Construct Binary Tree from Preorder and Inorder Traversal	42.6%	Medium
204	Count Primes	29.6%	Easy
38	Count and Say	41.4%	Easy
13	Roman to Integer	53.0%	Easy
153	Find Minimum in Rotated Sorted Array	43.4%	Medium
12	Integer to Roman	51.8%	Medium
64	Minimum Path Sum	48.1%	Medium
36	Valid Sudoku	44.3%	Medium
110	Balanced Binary Tree	41.5%	Easy
237	Delete Node in a Linked List	55.0%	Easy
160	Intersection of Two Linked Lists	35.1%	Easy
9	Palindrome Number	44.5%	Easy
108	Convert Sorted Array to Binary Search Tree	52.2%	Easy
709	To Lower Case	77.4%	Easy
39	Combination Sum	50.1%	Medium
198	House Robber	41.2%	Easy
46	Permutations	56.8%	Medium
217	Contains Duplicate	52.9%	Easy
141	Linked List Cycle	37.8%	Easy
125	Valid Palindrome	32.0%	Easy
88	Merge Sorted Array	36.5%	Easy
8	String to Integer (atoi)	14.8%	Medium
70	Climbing Stairs	44.8%	Easy
1108	Defanging an IP Address	85.0%	Easy

Filtering results for medium (google recent 6 month)

(cl-loop for row in tbl
      if (equal (nth 3 row) val)
      collect row into newtbl
      finally return newtbl)

✓ C-x 8 RET check mark RET

#	Title	Accpt	Diff
1057	Campus Bikes	58.4%	Medium	✓
222	Count Complete Tree Nodes	35.8%	Medium	✓
947	Most Stones Removed with Same Row or Column	54.4%	Medium	✓
1066	Campus Bikes II	49.6%	Medium	✓
833	Find And Replace in String	47.3%	Medium	✓
200	Number of Islands	42.5%	Medium	✓
2	Add Two Numbers	31.6%	Medium	✓
809	Expressive Words	44.2%	Medium	✓
524	Longest Word in Dictionary through Deleting	46.4%	Medium	✓
1007	Minimum Domino Rotations For Equal Row	48.9%	Medium	✓
353	Design Snake Game	31.2%	Medium	✓
1055	Shortest Way to Form String	58.7%	Medium	✓
56	Merge Intervals	36.3%	Medium
163	Missing Ranges	23.4%	Medium
963	Minimum Area Rectangle II	46.4%	Medium	✓
1011	Capacity To Ship Packages Within D Days	53.8%	Medium	✓
399	Evaluate Division	48.3%	Medium
939	Minimum Area Rectangle	51.1%	Medium
247	Strobogrammatic Number II	45.1%	Medium
731	My Calendar II	45.6%	Medium
253	Meeting Rooms II	43.4%	Medium
1087	Brace Expansion	59.4%	Medium
241	Different Ways to Add Parentheses	51.1%	Medium
15	3Sum	24.6%	Medium
900	RLE Iterator	50.8%	Medium
981	Time Based Key-Value Store	51.4%	Medium
743	Network Delay Time	43.3%	Medium
351	Android Unlock Patterns	46.5%	Medium
837	New 21 Game	32.2%	Medium
904	Fruit Into Baskets	41.8%	Medium
334	Increasing Triplet Subsequence	39.5%	Medium
394	Decode String	45.9%	Medium
767	Reorganize String	43.5%	Medium
708	Insert into a Cyclic Sorted List	29.8%	Medium
388	Longest Absolute File Path	39.5%	Medium
375	Guess Number Higher or Lower II	38.3%	Medium
616	Add Bold Tag in String	39.8%	Medium
777	Swap Adjacent in LR String	33.6%	Medium
304	Range Sum Query 2D - Immutable	33.5%	Medium
288	Unique Word Abbreviation	20.4%	Medium
3	Longest Substring Without Repeating Characters	28.7%	Medium
846	Hand of Straights	49.8%	Medium
987	Vertical Order Traversal of a Binary Tree	32.1%	Medium
853	Car Fleet	40.4%	Medium
34	Find Fst&Lst Position of Element in Sorted Array	34.0%	Medium
911	Online Election	47.8%	Medium
1048	Longest String Chain	49.0%	Medium
973	K Closest Points to Origin	61.5%	Medium
271	Encode and Decode Strings	27.5%	Medium
855	Exam Room	39.2%	Medium
5	Longest Palindromic Substring	27.8%	Medium
146	LRU Cache	26.8%	Medium
393	UTF-8 Validation	36.3%	Medium
366	Find Leaves of Binary Tree	66.9%	Medium
621	Task Scheduler	46.1%	Medium
497	Random Point in Non-overlapping Rectangles	36.0%	Medium
1110	Delete Nodes And Return Forest	63.1%	Medium
544	Output Contest Matches	73.8%	Medium
298	Binary Tree Longest Consecutive Sequence	44.6%	Medium
221	Maximal Square	33.8%	Medium
137	Single Number II	46.8%	Medium
528	Random Pick with Weight	43.0%	Medium
277	Find the Celebrity	37.8%	Medium
490	The Maze	48.3%	Medium
280	Wiggle Sort	61.5%	Medium
208	Implement Trie (Prefix Tree)	39.9%	Medium
139	Word Break	36.2%	Medium
55	Jump Game	32.4%	Medium
117	Populating Next Right Pointers in Each Node II	35.2%	Medium
742	Closest Leaf in a Binary Tree	40.1%	Medium
609	Find Duplicate File in System	56.1%	Medium
406	Queue Reconstruction by Height	60.6%	Medium
133	Clone Graph	27.8%	Medium
1091	Shortest Path in Binary Matrix	36.5%	Medium
31	Next Permutation	30.9%	Medium
150	Evaluate Reverse Polish Notation	33.0%	Medium
951	Flip Equivalent Binary Trees	64.8%	Medium
261	Graph Valid Tree	40.3%	Medium
210	Course Schedule II	35.9%	Medium
380	Insert Delete GetRandom O(1)	43.5%	Medium
498	Diagonal Traverse	45.7%	Medium
148	Sort List	36.7%	Medium
238	Product of Array Except Self	56.1%	Medium
737	Sentence Similarity II	43.9%	Medium
714	Best Time to Buy/Sell Stock with Transaction Fee	51.2%	Medium
659	Split Array into Consecutive Subsequences	41.2%	Medium
385	Mini Parser	32.3%	Medium
281	Zigzag Iterator	56.4%	Medium
438	Find All Anagrams in a String	38.0%	Medium
979	Distribute Coins in Binary Tree	67.7%	Medium
702	Search in a Sorted Array of Unknown Size	60.6%	Medium
11	Container With Most Water	46.1%	Medium
215	Kth Largest Element in an Array	49.3%	Medium
347	Top K Frequent Elements	56.1%	Medium
1024	Video Stitching	47.0%	Medium
386	Lexicographical Numbers	47.4%	Medium
332	Reconstruct Itinerary	32.3%	Medium
300	Longest Increasing Subsequence	41.2%	Medium
681	Next Closest Time	43.0%	Medium
379	Design Phone Directory	42.7%	Medium
130	Surrounded Regions	23.6%	Medium
22	Generate Parentheses	56.5%	Medium
802	Find Eventual Safe States	44.9%	Medium
535	Encode and Decode TinyURL	77.4%	Medium
17	Letter Combinations of a Phone Number	42.6%	Medium
156	Binary Tree Upside Down	51.8%	Medium
505	The Maze II	44.9%	Medium
127	Word Ladder	25.1%	Medium
518	Coin Change 2	43.7%	Medium
382	Linked List Random Node	49.8%	Medium
935	Knight Dialer	41.8%	Medium
486	Predict the Winner	47.0%	Medium
54	Spiral Matrix	31.1%	Medium
540	Single Element in a Sorted Array	57.5%	Medium
284	Peeking Iterator	41.5%	Medium
309	Best Time to Buy and Sell Stock with Cooldown	44.6%	Medium
43	Multiply Strings	31.3%	Medium
79	Word Search	32.1%	Medium
250	Count Univalue Subtrees	49.8%	Medium
378	Kth Smallest Element in a Sorted Matrix	50.4%	Medium
417	Pacific Atlantic Water Flow	38.1%	Medium
636	Exclusive Time of Functions	49.2%	Medium
529	Minesweeper	54.0%	Medium
201	Bitwise AND of Numbers Range	36.4%	Medium
343	Integer Break	48.4%	Medium
986	Interval List Intersections	63.8%	Medium
622	Design Circular Queue	40.4%	Medium
274	H-Index	34.8%	Medium
692	Top K Frequent Words	46.7%	Medium
289	Game of Life	47.1%	Medium
310	Minimum Height Trees	30.6%	Medium
144	Binary Tree Preorder Traversal	52.3%	Medium
152	Maximum Product Subarray	29.8%	Medium
187	Repeated DNA Sequences	36.7%	Medium
1145	Binary Tree Coloring Game	46.0%	Medium
662	Maximum Width of Binary Tree	39.5%	Medium
33	Search in Rotated Sorted Array	33.1%	Medium
48	Rotate Image	50.0%	Medium
739	Daily Temperatures	60.4%	Medium
94	Binary Tree Inorder Traversal	58.0%	Medium
279	Perfect Squares	42.8%	Medium
116	Populating Next Right Pointers in Each Node	38.9%	Medium
98	Validate Binary Search Tree	26.1%	Medium
688	Knight Probability in Chessboard	45.3%	Medium
322	Coin Change	31.5%	Medium
62	Unique Paths	48.7%	Medium
166	Fraction to Recurring Decimal	19.8%	Medium
63	Unique Paths II	33.6%	Medium
542	01 Matrix	36.5%	Medium
162	Find Peak Element	41.7%	Medium
523	Continuous Subarray Sum	24.2%	Medium
49	Group Anagrams	48.6%	Medium
451	Sort Characters By Frequency	56.9%	Medium
138	Copy List with Random Pointer	28.3%	Medium
287	Find the Duplicate Number	50.7%	Medium
442	Find All Duplicates in an Array	62.0%	Medium
229	Majority Element II	32.8%	Medium
16	3Sum Closest	45.8%	Medium
19	Remove Nth Node From End of List	34.5%	Medium
785	Is Graph Bipartite?	44.3%	Medium
560	Subarray Sum Equals K	42.7%	Medium
177	Nth Highest Salary	27.3%	Medium
103	Binary Tree Zigzag Level Order Traversal	42.8%	Medium
131	Palindrome Partitioning	42.2%	Medium
109	Convert Sorted List to Binary Search Tree	42.0%	Medium
213	House Robber II	35.5%	Medium
6	ZigZag Conversion	32.9%	Medium
207	Course Schedule	38.8%	Medium
81	Search in Rotated Sorted Array II	32.7%	Medium
75	Sort Colors	43.0%	Medium
24	Swap Nodes in Pairs	45.9%	Medium
50	Pow(x, n)	28.4%	Medium
78	Subsets	54.4%	Medium
77	Combinations	49.2%	Medium
328	Odd Even Linked List	50.1%	Medium
173	Binary Search Tree Iterator	49.9%	Medium
18	4Sum	31.3%	Medium
240	Search a 2D Matrix II	41.2%	Medium
40	Combination Sum II	43.0%	Medium
199	Binary Tree Right Side View	49.0%	Medium
105	Constr. BinTree fr Preorder & Inorder Traversal	42.6%	Medium
153	Find Minimum in Rotated Sorted Array	43.4%	Medium
12	Integer to Roman	51.8%	Medium
64	Minimum Path Sum	48.1%	Medium
36	Valid Sudoku	44.3%	Medium
39	Combination Sum	50.1%	Medium
46	Permutations	56.8%	Medium
8	String to Integer (atoi)	14.8%	Medium	✓

Filtering results for hard (google recent 6 month)

(cl-loop for row in tbl
      if (equal (nth 3 row) val)
      collect row into newtbl
      finally return newtbl)

#	Title	Accpt	Diff
410	Split Array Largest Sum	42.8%	Hard
975	Odd Even Jump	46.3%	Hard
843	Guess the Word	44.4%	Hard
753	Cracking the Safe	47.5%	Hard
489	Robot Room Cleaner	65.7%	Hard
913	Cat and Mouse	29.1%	Hard
1096	Brace Expansion II	55.8%	Hard
4	Median of Two Sorted Arrays	27.1%	Hard
158	Read N Characters Given Read4 II - Call multiple times	27.4%	Hard
818	Race Car	35.8%	Hard
642	Design Search Autocomplete System	39.1%	Hard
465	Optimal Account Balancing	43.4%	Hard
57	Insert Interval	31.6%	Hard
1032	Stream of Characters	42.4%	Hard
857	Minimum Cost to Hire K Workers	48.1%	Hard
943	Find the Shortest Superstring	38.6%	Hard
42	Trapping Rain Water	44.2%	Hard
248	Strobogrammatic Number III	37.2%	Hard
679	24 Game	43.5%	Hard
315	Count of Smaller Numbers After Self	38.9%	Hard
354	Russian Doll Envelopes	34.3%	Hard
124	Binary Tree Maximum Path Sum	30.7%	Hard
710	Random Pick with Blacklist	32.0%	Hard
329	Longest Increasing Path in a Matrix	40.7%	Hard
660	Remove 9	52.2%	Hard
425	Word Squares	45.1%	Hard
727	Minimum Window Subsequence	38.0%	Hard
736	Parse Lisp Expression	44.8%	Hard
308	Range Sum Query 2D - Mutable	32.8%	Hard
774	Minimize Max Distance to Gas Station	42.8%	Hard
218	The Skyline Problem	32.2%	Hard
458	Poor Pigs	46.0%	Hard
527	Word Abbreviation	51.1%	Hard
128	Longest Consecutive Sequence	42.4%	Hard
10	Regular Expression Matching	25.6%	Hard
1036	Escape a Large Maze	35.2%	Hard
552	Student Attendance Record II	33.7%	Hard
340	Longest Substring with At Most K Distinct Characters	40.6%	Hard
685	Redundant Connection II	31.0%	Hard
44	Wildcard Matching	23.2%	Hard
159	Longest Substring with At Most Two Distinct Characters	47.6%	Hard
428	Serialize and Deserialize N-ary Tree	55.0%	Hard
871	Minimum Number of Refueling Stops	29.8%	Hard
85	Maximal Rectangle	34.2%	Hard
297	Serialize and Deserialize Binary Tree	42.1%	Hard
839	Similar String Groups	35.3%	Hard
363	Max Sum of Rectangle No Larger Than K	35.5%	Hard
317	Shortest Distance from All Buildings	38.6%	Hard
76	Minimum Window Substring	31.6%	Hard
403	Frog Jump	36.8%	Hard
149	Max Points on a Line	16.0%	Hard
126	Word Ladder II	18.5%	Hard
132	Palindrome Partitioning II	28.1%	Hard
773	Sliding Puzzle	53.6%	Hard
296	Best Meeting Point	55.7%	Hard
212	Word Search II	29.6%	Hard
185	Department Top Three Salaries	27.5%	Hard
992	Subarrays with K Different Integers	44.9%	Hard
480	Sliding Window Median	33.4%	Hard
30	Substring with Concatenation of All Words	24.0%	Hard
269	Alien Dictionary	31.9%	Hard
980	Unique Paths III	71.2%	Hard
188	Best Time to Buy and Sell Stock IV	26.7%	Hard
72	Edit Distance	39.0%	Hard
239	Sliding Window Maximum	39.0%	Hard
51	N-Queens	40.8%	Hard
140	Word Break II	28.0%	Hard
316	Remove Duplicate Letters	33.2%	Hard
23	Merge k Sorted Lists	35.6%	Hard
68	Text Justification	24.0%	Hard
84	Largest Rectangle in Histogram	32.0%	Hard
295	Find Median from Data Stream	38.0%	Hard
45	Jump Game II	28.6%	Hard
97	Interleaving String	28.6%	Hard
65	Valid Number	14.2%	Hard
37	Sudoku Solver	38.3%	Hard
224	Basic Calculator	33.6%	Hard
32	Longest Valid Parentheses	26.1%	Hard
41	First Missing Positive	29.5%	Hard