Top 150Amazon

#	Title	Difficulty	Frequency	Acceptance
2340	Minimum Adjacent Swaps to Make a Valid Array	Medium
2781	Length of the Longest Valid Substring	Hard
1152	Analyze User Website Visit Pattern	Medium
2055	Plates Between Candles	Medium
2268	Minimum Number of Keypresses	Medium
472	Concatenated Words	Hard
146	LRU Cache	Medium
767	Reorganize String	Medium
127	Word Ladder	Hard
200	Number of Islands	Medium
2281	Sum of Total Strength of Wizards	Hard
1	Two Sum	Easy
140	Word Break II	Hard
2870	Minimum Number of Operations to Make Array Empty	Medium
950	Reveal Cards In Increasing Order	Medium
42	Trapping Rain Water	Hard
875	Koko Eating Bananas	Medium
49	Group Anagrams	Medium
210	Course Schedule II	Medium
1478	Allocate Mailboxes	Hard
3134	Find the Median of the Uniqueness Array	Hard
253	Meeting Rooms II	Medium
56	Merge Intervals	Medium
791	Custom Sort String	Medium
545	Boundary of Binary Tree	Medium
2288	Apply Discount to Prices	Medium
1485	Clone Binary Tree With Random Pointer	Medium
3	Longest Substring Without Repeating Characters	Medium
2802	Find The K-th Lucky Number	Medium
273	Integer to English Words	Hard
88	Merge Sorted Array	Easy
1002	Find Common Characters	Easy
642	Design Search Autocomplete System	Hard
295	Find Median from Data Stream	Hard
1457	Pseudo-Palindromic Paths in a Binary Tree	Medium
2667	Create Hello World Function	Easy
1268	Search Suggestions System	Medium
480	Sliding Window Median	Hard
227	Basic Calculator II	Medium
1082	Sales Analysis I	Easy
10	Regular Expression Matching	Hard
752	Open the Lock	Medium
1063	Number of Valid Subarrays	Hard
3075	Maximize Happiness of Selected Children	Medium
826	Most Profit Assigning Work	Medium
460	LFU Cache	Hard
239	Sliding Window Maximum	Hard
212	Word Search II	Hard
23	Merge k Sorted Lists	Hard
907	Sum of Subarray Minimums	Medium
694	Number of Distinct Islands	Medium
945	Minimum Increment to Make Array Unique	Medium
138	Copy List with Random Pointer	Medium
236	Lowest Common Ancestor of a Binary Tree	Medium
380	Insert Delete GetRandom O(1)	Medium
1225	Report Contiguous Dates	Hard
2385	Amount of Time for Binary Tree to Be Infected	Medium
2697	Lexicographically Smallest Palindrome	Easy
503	Next Greater Element II	Medium
1454	Active Users	Medium
3102	Minimize Manhattan Distances	Hard
1239	Maximum Length of a Concatenated String with Unique Characters	Medium
2092	Find All People With Secret	Hard
632	Smallest Range Covering Elements from K Lists	Hard
215	Kth Largest Element in an Array	Medium
4	Median of Two Sorted Arrays	Hard
1777	Product's Price for Each Store	Easy
150	Evaluate Reverse Polish Notation	Medium
286	Walls and Gates	Medium
17	Letter Combinations of a Phone Number	Medium
5	Longest Palindromic Substring	Medium
20	Valid Parentheses	Easy
121	Best Time to Buy and Sell Stock	Easy
1289	Minimum Falling Path Sum II	Hard
2370	Longest Ideal Subsequence	Medium
588	Design In-Memory File System	Hard
2262	Total Appeal of A String	Hard
347	Top K Frequent Elements	Medium
2799	Count Complete Subarrays in an Array	Medium
41	First Missing Positive	Hard
399	Evaluate Division	Medium
387	First Unique Character in a String	Easy
881	Boats to Save People	Medium
888	Fair Candy Swap	Easy
207	Course Schedule	Medium
55	Jump Game	Medium
786	K-th Smallest Prime Fraction	Medium
442	Find All Duplicates in an Array	Medium
1768	Merge Strings Alternately	Easy
22	Generate Parentheses	Medium
1044	Longest Duplicate Substring	Hard
1122	Relative Sort Array	Easy
633	Sum of Square Numbers	Medium
1509	Minimum Difference Between Largest and Smallest Value in Three Moves	Medium
2134	Minimum Swaps to Group All 1's Together II	Medium
2256	Minimum Average Difference	Medium
385	Mini Parser	Medium
2	Add Two Numbers	Medium
1219	Path with Maximum Gold	Medium
48	Rotate Image	Medium
13	Roman to Integer	Easy
109	Convert Sorted List to Binary Search Tree	Medium
869	Reordered Power of 2	Medium
1654	Minimum Jumps to Reach Home	Medium
205	Isomorphic Strings	Easy
528	Random Pick with Weight	Medium
1209	Remove All Adjacent Duplicates in String II	Medium
1650	Lowest Common Ancestor of a Binary Tree III	Medium
11	Container With Most Water	Medium
1083	Sales Analysis II	Easy
314	Binary Tree Vertical Order Traversal	Medium
582	Kill Process	Medium
2250	Count Number of Rectangles Containing Each Point	Medium
430	Flatten a Multilevel Doubly Linked List	Medium
103	Binary Tree Zigzag Level Order Traversal	Medium
3139	Minimum Cost to Equalize Array	Hard
496	Next Greater Element I	Easy
556	Next Greater Element III	Medium
2222	Number of Ways to Select Buildings	Medium
735	Asteroid Collision	Medium
1496	Path Crossing	Easy
772	Basic Calculator III	Hard
968	Binary Tree Cameras	Hard
3152	Special Array II	Medium
322	Coin Change	Medium
297	Serialize and Deserialize Binary Tree	Hard
33	Search in Rotated Sorted Array	Medium
1353	Maximum Number of Events That Can Be Attended	Medium
269	Alien Dictionary	Hard
729	My Calendar I	Medium
238	Product of Array Except Self	Medium
547	Number of Provinces	Medium
937	Reorder Data in Log Files	Medium
18	4Sum	Medium
475	Heaters	Medium
2285	Maximum Total Importance of Roads	Medium
84	Largest Rectangle in Histogram	Hard
1143	Longest Common Subsequence	Medium
15	3Sum	Medium
1291	Sequential Digits	Medium
128	Longest Consecutive Sequence	Medium
812	Largest Triangle Area	Easy
2653	Sliding Subarray Beauty	Medium
85	Maximal Rectangle	Hard
1757	Recyclable and Low Fat Products	Easy
739	Daily Temperatures	Medium
973	K Closest Points to Origin	Medium
201	Bitwise AND of Numbers Range	Medium
525	Contiguous Array	Medium
3144	Minimum Substring Partition of Equal Character Frequency	Medium
1052	Grumpy Bookstore Owner	Medium
134	Gas Station	Medium
581	Shortest Unsorted Continuous Subarray	Medium
1882	Process Tasks Using Servers	Medium
402	Remove K Digits	Medium
36	Valid Sudoku	Medium
994	Rotting Oranges	Medium
53	Maximum Subarray	Medium
1248	Count Number of Nice Subarrays	Medium
1326	Minimum Number of Taps to Open to Water a Garden	Hard
979	Distribute Coins in Binary Tree	Medium
502	IPO	Hard
233	Number of Digit One	Hard
1352	Product of the Last K Numbers	Medium
395	Longest Substring with At Least K Repeating Characters	Medium
1347	Minimum Number of Steps to Make Two Strings Anagram	Medium
139	Word Break	Medium
410	Split Array Largest Sum	Hard
412	Fizz Buzz	Easy
695	Max Area of Island	Medium
1043	Partition Array for Maximum Sum	Medium
218	The Skyline Problem	Hard
54	Spiral Matrix	Medium
78	Subsets	Medium
74	Search a 2D Matrix	Medium
815	Bus Routes	Hard
1103	Distribute Candies to People	Easy
2405	Optimal Partition of String	Medium
179	Largest Number	Medium
857	Minimum Cost to Hire K Workers	Hard
2486	Append Characters to String to Make Subsequence	Medium
332	Reconstruct Itinerary	Hard
2391	Minimum Amount of Time to Collect Garbage	Medium
79	Word Search	Medium
2091	Removing Minimum and Maximum From Array	Medium
2441	Largest Positive Integer That Exists With Its Negative	Easy
781	Rabbits in Forest	Medium
1329	Sort the Matrix Diagonally	Medium
300	Longest Increasing Subsequence	Medium
2540	Minimum Common Value	Easy
330	Patching Array	Hard
3014	Minimum Number of Pushes to Type Word I	Easy
909	Snakes and Ladders	Medium
143	Reorder List	Medium
3005	Count Elements With Maximum Frequency	Easy
32	Longest Valid Parentheses	Hard
1255	Maximum Score Words Formed by Letters	Hard
14	Longest Common Prefix	Easy
1642	Furthest Building You Can Reach	Medium
118	Pascal's Triangle	Easy
198	House Robber	Medium
31	Next Permutation	Medium
706	Design HashMap	Easy
464	Can I Win	Medium
1429	First Unique Number	Medium
2928	Distribute Candies Among Children I	Easy
2096	Step-By-Step Directions From a Binary Tree Node to Another	Medium
169	Majority Element	Easy
136	Single Number	Easy
1382	Balance a Binary Search Tree	Medium
981	Time Based Key-Value Store	Medium
349	Intersection of Two Arrays	Easy
162	Find Peak Element	Medium
19	Remove Nth Node From End of List	Medium
995	Minimum Number of K Consecutive Bit Flips	Hard
1700	Number of Students Unable to Eat Lunch	Easy
901	Online Stock Span	Medium
70	Climbing Stairs	Easy
232	Implement Queue using Stacks	Easy
289	Game of Life	Medium
523	Continuous Subarray Sum	Medium
317	Shortest Distance from All Buildings	Hard
1171	Remove Zero Sum Consecutive Nodes from Linked List	Medium
287	Find the Duplicate Number	Medium
91	Decode Ways	Medium
974	Subarray Sums Divisible by K	Medium
509	Fibonacci Number	Easy
368	Largest Divisible Subset	Medium
2444	Count Subarrays With Fixed Bounds	Hard
443	String Compression	Medium
560	Subarray Sum Equals K	Medium
930	Binary Subarrays With Sum	Medium
241	Different Ways to Add Parentheses	Medium
468	Validate IP Address	Medium
787	Cheapest Flights Within K Stops	Medium
124	Binary Tree Maximum Path Sum	Hard
691	Stickers to Spell Word	Hard
2225	Find Players With Zero or One Losses	Medium
51	N-Queens	Hard
277	Find the Celebrity	Medium
721	Accounts Merge	Medium
1207	Unique Number of Occurrences	Easy
2115	Find All Possible Recipes from Given Supplies	Medium
1091	Shortest Path in Binary Matrix	Medium
45	Jump Game II	Medium
344	Reverse String	Easy
260	Single Number III	Medium
433	Minimum Genetic Mutation	Medium
863	All Nodes Distance K in Binary Tree	Medium
165	Compare Version Numbers	Medium
997	Find the Town Judge	Easy
2357	Make Array Zero by Subtracting Equal Amounts	Easy
101	Symmetric Tree	Easy
1095	Find in Mountain Array	Hard
452	Minimum Number of Arrows to Burst Balloons	Medium
93	Restore IP Addresses	Medium
912	Sort an Array	Medium
3164	Find the Number of Good Pairs II	Medium
69	Sqrt(x)	Easy
797	All Paths From Source to Target	Medium
268	Missing Number	Easy
1358	Number of Substrings Containing All Three Characters	Medium
658	Find K Closest Elements	Medium
8	String to Integer (atoi)	Medium
987	Vertical Order Traversal of a Binary Tree	Hard
211	Design Add and Search Words Data Structure	Medium
9	Palindrome Number	Easy
199	Binary Tree Right Side View	Medium
887	Super Egg Drop	Hard
570	Managers with at Least 5 Direct Reports	Medium
278	First Bad Version	Easy
7	Reverse Integer	Medium
29	Divide Two Integers	Medium
348	Design Tic-Tac-Toe	Medium
25	Reverse Nodes in k-Group	Hard
174	Dungeon Game	Hard
1146	Snapshot Array	Medium
44	Wildcard Matching	Hard
713	Subarray Product Less Than K	Medium
450	Delete Node in a BST	Medium
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium
24	Swap Nodes in Pairs	Medium
1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium
191	Number of 1 Bits	Easy
708	Insert into a Sorted Circular Linked List	Medium
1160	Find Words That Can Be Formed by Characters	Easy
1863	Sum of All Subset XOR Totals	Easy
152	Maximum Product Subarray	Medium
341	Flatten Nested List Iterator	Medium
66	Plus One	Easy
1637	Widest Vertical Area Between Two Points Containing No Points	Easy
2259	Remove Digit From Number to Maximize Result	Easy
283	Move Zeroes	Easy
779	K-th Symbol in Grammar	Medium
645	Set Mismatch	Easy
628	Maximum Product of Three Numbers	Easy
71	Simplify Path	Medium
2013	Detect Squares	Medium
501	Find Mode in Binary Search Tree	Easy
532	K-diff Pairs in an Array	Medium
26	Remove Duplicates from Sorted Array	Easy
743	Network Delay Time	Medium
131	Palindrome Partitioning	Medium
543	Diameter of Binary Tree	Easy
498	Diagonal Traverse	Medium
312	Burst Balloons	Hard
21	Merge Two Sorted Lists	Easy
299	Bulls and Cows	Medium
1249	Minimum Remove to Make Valid Parentheses	Medium
155	Min Stack	Medium
1492	The kth Factor of n	Medium
1313	Decompress Run-Length Encoded List	Easy
100	Same Tree	Easy
339	Nested List Weight Sum	Medium
6	Zigzag Conversion	Medium
2461	Maximum Sum of Distinct Subarrays With Length K	Medium
1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Medium
876	Middle of the Linked List	Easy
1325	Delete Leaves With a Given Value	Medium
2433	Find The Original Array of Prefix Xor	Medium
976	Largest Perimeter Triangle	Easy
90	Subsets II	Medium
262	Trips and Users	Hard
2402	Meeting Rooms III	Hard
1304	Find N Unique Integers Sum up to Zero	Easy
279	Perfect Squares	Medium
359	Logger Rate Limiter	Easy
1762	Buildings With an Ocean View	Medium
95	Unique Binary Search Trees II	Medium
1603	Design Parking System	Easy
438	Find All Anagrams in a String	Medium
214	Shortest Palindrome	Hard
57	Insert Interval	Medium
1750	Minimum Length of String After Deleting Similar Ends	Medium
2037	Minimum Number of Moves to Seat Everyone	Easy
790	Domino and Tromino Tiling	Medium
1512	Number of Good Pairs	Easy
1752	Check if Array Is Sorted and Rotated	Easy
86	Partition List	Medium
39	Combination Sum	Medium
485	Max Consecutive Ones	Easy
1661	Average Time of Process per Machine	Easy
1482	Minimum Number of Days to Make m Bouquets	Medium
180	Consecutive Numbers	Medium
424	Longest Repeating Character Replacement	Medium
1235	Maximum Profit in Job Scheduling	Hard
217	Contains Duplicate	Easy
2011	Final Value of Variable After Performing Operations	Easy
76	Minimum Window Substring	Hard
197	Rising Temperature	Easy
941	Valid Mountain Array	Easy
62	Unique Paths	Medium
415	Add Strings	Easy
408	Valid Word Abbreviation	Easy
133	Clone Graph	Medium
621	Task Scheduler	Medium
98	Validate Binary Search Tree	Medium
1089	Duplicate Zeros	Easy
986	Interval List Intersections	Medium
122	Best Time to Buy and Sell Stock II	Medium
374	Guess Number Higher or Lower	Easy
378	Kth Smallest Element in a Sorted Matrix	Medium
647	Palindromic Substrings	Medium
463	Island Perimeter	Easy
2485	Find the Pivot Integer	Easy
733	Flood Fill	Easy
437	Path Sum III	Medium
104	Maximum Depth of Binary Tree	Easy
867	Transpose Matrix	Easy
94	Binary Tree Inorder Traversal	Easy
1493	Longest Subarray of 1's After Deleting One Element	Medium
1011	Capacity To Ship Packages Within D Days	Medium
1657	Determine if Two Strings Are Close	Medium
28	Find the Index of the First Occurrence in a String	Easy
455	Assign Cookies	Easy
2035	Partition Array Into Two Arrays to Minimize Sum Difference	Hard
328	Odd Even Linked List	Medium
135	Candy	Hard
181	Employees Earning More Than Their Managers	Easy
680	Valid Palindrome II	Easy
692	Top K Frequent Words	Medium
540	Single Element in a Sorted Array	Medium
852	Peak Index in a Mountain Array	Medium
703	Kth Largest Element in a Stream	Easy
2535	Difference Between Element Sum and Digit Sum of an Array	Easy
605	Can Place Flowers	Easy
1047	Remove All Adjacent Duplicates In String	Easy
2073	Time Needed to Buy Tickets	Easy
1351	Count Negative Numbers in a Sorted Matrix	Easy
416	Partition Equal Subset Sum	Medium
37	Sudoku Solver	Hard
46	Permutations	Medium
1791	Find Center of Star Graph	Easy
43	Multiply Strings	Medium
50	Pow(x, n)	Medium
1466	Reorder Routes to Make All Paths Lead to the City Zero	Medium
206	Reverse Linked List	Easy
242	Valid Anagram	Easy
75	Sort Colors	Medium
1838	Frequency of the Most Frequent Element	Medium
219	Contains Duplicate II	Easy
112	Path Sum	Easy
827	Making A Large Island	Hard
1470	Shuffle the Array	Easy
1050	Actors and Directors Who Cooperated At Least Three Times	Easy
141	Linked List Cycle	Easy
329	Longest Increasing Path in a Matrix	Hard
34	Find First and Last Position of Element in Sorted Array	Medium
117	Populating Next Right Pointers in Each Node II	Medium
65	Valid Number	Hard
459	Repeated Substring Pattern	Easy
73	Set Matrix Zeroes	Medium
435	Non-overlapping Intervals	Medium
1431	Kids With the Greatest Number of Candies	Easy
1319	Number of Operations to Make Network Connected	Medium
202	Happy Number	Easy
12	Integer to Roman	Medium
303	Range Sum Query - Immutable	Easy
345	Reverse Vowels of a String	Easy
1971	Find if Path Exists in Graph	Easy
2877	Create a DataFrame from List	Easy
27	Remove Element	Easy
338	Counting Bits	Easy
290	Word Pattern	Easy
148	Sort List	Medium
175	Combine Two Tables	Easy
1572	Matrix Diagonal Sum	Easy
68	Text Justification	Hard
182	Duplicate Emails	Easy
1922	Count Good Numbers	Medium
204	Count Primes	Medium
234	Palindrome Linked List	Easy
724	Find Pivot Index	Easy
226	Invert Binary Tree	Easy
2620	Counter	Easy
184	Department Highest Salary	Medium
102	Binary Tree Level Order Traversal	Medium
2058	Find the Minimum and Maximum Number of Nodes Between Critical Points	Medium
224	Basic Calculator	Hard
1193	Monthly Transactions I	Medium
550	Game Play Analysis IV	Medium
96	Unique Binary Search Trees	Medium
841	Keys and Rooms	Medium
72	Edit Distance	Medium
178	Rank Scores	Medium
137	Single Number II	Medium
409	Longest Palindrome	Easy
119	Pascal's Triangle II	Easy
844	Backspace String Compare	Easy
1423	Maximum Points You Can Obtain from Cards	Medium
771	Jewels and Stones	Easy
392	Is Subsequence	Easy
60	Permutation Sequence	Hard
153	Find Minimum in Rotated Sorted Array	Medium
653	Two Sum IV - Input is a BST	Easy
585	Investments in 2016	Medium
577	Employee Bonus	Easy
30	Substring with Concatenation of All Words	Hard
106	Construct Binary Tree from Inorder and Postorder Traversal	Medium
678	Valid Parenthesis String	Medium
129	Sum Root to Leaf Numbers	Medium
235	Lowest Common Ancestor of a Binary Search Tree	Medium
451	Sort Characters By Frequency	Medium
1204	Last Person to Fit in the Bus	Medium
1071	Greatest Common Divisor of Strings	Easy
493	Reverse Pairs	Hard
1539	Kth Missing Positive Number	Easy
189	Rotate Array	Medium
230	Kth Smallest Element in a BST	Medium
1021	Remove Outermost Parentheses	Easy
383	Ransom Note	Easy
1701	Average Waiting Time	Medium
240	Search a 2D Matrix II	Medium
58	Length of Last Word	Easy
125	Valid Palindrome	Easy
2235	Add Two Integers	Easy
1141	User Activity for the Past 30 Days I	Easy
1614	Maximum Nesting Depth of the Parentheses	Easy
595	Big Countries	Easy
1732	Find the Highest Altitude	Easy
572	Subtree of Another Tree	Easy
67	Add Binary	Easy
1070	Product Sales Analysis III	Medium
110	Balanced Binary Tree	Easy
38	Count and Say	Medium
1211	Queries Quality and Percentage	Easy
77	Combinations	Medium
108	Convert Sorted Array to Binary Search Tree	Easy
2665	Counter II	Easy
80	Remove Duplicates from Sorted Array II	Medium
208	Implement Trie (Prefix Tree)	Medium
16	3Sum Closest	Medium
120	Triangle	Medium
350	Intersection of Two Arrays II	Easy
1045	Customers Who Bought All Products	Medium
2095	Delete the Middle Node of a Linked List	Medium
229	Majority Element II	Medium
977	Squares of a Sorted Array	Easy
3110	Score of a String	Easy
63	Unique Paths II	Medium
1148	Article Views I	Easy
237	Delete Node in a Linked List	Medium
64	Minimum Path Sum	Medium
61	Rotate List	Medium
1581	Customer Who Visited but Did Not Make Any Transactions	Easy
1672	Richest Customer Wealth	Easy
40	Combination Sum II	Medium
2149	Rearrange Array Elements by Sign	Medium
160	Intersection of Two Linked Lists	Easy
225	Implement Stack using Queues	Easy
35	Search Insert Position	Easy
81	Search in Rotated Sorted Array II	Medium
1280	Students and Examinations	Easy
167	Two Sum II - Input Array Is Sorted	Medium
151	Reverse Words in a String	Medium
1598	Crawler Log Folder	Easy
584	Find Customer Referee	Easy
1068	Product Sales Analysis I	Easy