LeetCode

LeetCode Algorithm

(Notes: "🔒" means you need to buy a book from Leetcode)

#	Title	Solution	Difficulty
1851	Minimum Interval to Include Each Query	Solution, C++, Java, Go	Hard
1850	Minimum Adjacent Swaps to Reach the Kth Smallest Number	Solution, C++, Java, Go	Medium
1849	Splitting a String Into Descending Consecutive Values	Solution, C++, Java, Go	Medium
1848	Minimum Distance to the Target Element	Solution, C++, Java, Go	Easy
1847	Closest Room	Solution, C++, Java, Go	Hard
1846	Maximum Element After Decreasing and Rearranging	Solution, C++, Java, Go	Medium
1845	Seat Reservation Manager	Solution, C++, Java, Go	Medium
1844	Replace All Digits with Characters	Solution, C++, Java, Go	Easy
1840	Maximum Building Height	Solution, C++, Java, Go	Hard
1839	Longest Substring Of All Vowels in Order	Solution, C++, Java, Go	Medium
1838	Frequency of the Most Frequent Element	Solution, C++, Java, Go	Medium
1837	Sum of Digits in Base K	Solution, C++, Java, Go	Easy
1835	Find XOR Sum of All Pairs Bitwise AND	Solution, C++, Java, Go	Hard
1834	Single-Threaded CPU	Solution, C++, Java, Go	Medium
1833	Maximum Ice Cream Bars	Solution, C++, Java, Go	Medium
1832	Check if the Sentence Is Pangram	Solution, C++, Java, Go	Easy
1829	Maximum XOR for Each Query	Solution, C++, Java, Go	Medium
1828	Queries on Number of Points Inside a Circle	Solution, C++, Java, Go	Medium
1827	Minimum Operations to Make the Array Increasing	Solution, C++, Java, Go	Easy
1825	Finding MK Average	Solution, C++, Java, Go	Hard
1824	Minimum Sideway Jumps	Solution, C++, Java, Go	Medium
1823	Find the Winner of the Circular Game	Solution, C++, Java, Go	Medium
1822	Sign of the Product of an Array	Solution, C++, Java, Go	Easy
1819	Number of Different Subsequences GCDs	Solution, C++, Java, Go	Hard
1818	Minimum Absolute Sum Difference	Solution, C++, Java, Go	Medium
1817	Finding the Users Active Minutes	Solution, C++, Java, Go	Medium
1816	Truncate Sentence	Solution, C++, Java, Go	Easy
1815	Maximum Number of Groups Getting Fresh Donuts	Solution, C++, Java, Go	Hard
1814	Count Nice Pairs in an Array	Solution, C++, Java, Go	Medium
1813	Sentence Similarity III	Solution, C++, Java, Go	Medium
1812	Determine Color of a Chessboard Square	Solution, C++, Java, Go	Easy
1808	Maximize Number of Nice Divisors	Solution, C++, Java, Go	Hard
1807	Evaluate the Bracket Pairs of a String	Solution, C++, Java, Go	Medium
1806	Minimum Number of Operations to Reinitialize a Permutation	Solution, C++, Java, Go	Medium
1805	Number of Different Integers in a String	Solution, C++, Java, Go	Easy
1803	Count Pairs With XOR in a Range	Solution, C++, Java, Go	Hard
1802	Maximum Value at a Given Index in a Bounded Array	Solution, C++, Java, Go	Medium
1801	Number of Orders in the Backlog	Solution, C++, Java, Go	Medium
1800	Maximum Ascending Subarray Sum	Solution, C++, Java, Go	Easy
1799	Maximize Score After N Operations	Solution, C++, Java, Go	Hard
1798	Maximum Number of Consecutive Values You Can Make	Solution, C++, Java, Go	Medium
1797	Design Authentication Manager	Solution, C++, Java, Go	Medium
1796	Second Largest Digit in a String	Solution, C++, Java, Go	Easy
1793	Maximum Score of a Good Subarray	Solution, C++, Java, Go	Hard
1792	Maximum Average Pass Ratio	Solution, C++, Java, Go	Medium
1791	Find Center of Star Graph	Solution, C++, Java, Go	Medium
1790	Check if One String Swap Can Make Strings Equal	Solution, C++, Java, Go	Easy
1787	Make the XOR of All Segments Equal to Zero	Solution, C++, Java, Go	Hard
1786	Number of Restricted Paths From First to Last Node	Solution, C++, Java, Go	Medium
1785	Minimum Elements to Add to Form a Given Sum	Solution, C++, Java, Go	Medium
1784	Check if Binary String Has at Most One Segment of Ones	Solution, C++, Java, Go	Easy
1782	Count Pairs Of Nodes	Solution, C++, Java, Go	Hard
1781	Sum of Beauty of All Substrings	Solution, C++, Java, Go	Medium
1780	Check if Number is a Sum of Powers of Three	Solution, C++, Java, Go	Medium
1779	Find Nearest Point That Has the Same X or Y Coordinate	Solution, C++, Java, Go	Easy
1775	Equal Sum Arrays With Minimum Number of Operations	Solution, C++, Java, Go	Medium
1774	Closest Dessert Cost	Solution, C++, Java, Go	Medium
1773	Count Items Matching a Rule	Solution, C++, Java, Go	Easy
1771	Maximize Palindrome Length From Subsequences	Solution, C++, Java, Go	Hard
1770	Maximum Score from Performing Multiplication Operations	Solution, C++, Java, Go	Medium
1769	Minimum Number of Operations to Move All Balls to Each Box	Solution, C++, Java, Go	Medium
1768	Merge Strings Alternately	Solution, C++, Java, Go	Easy
1766	Tree of Coprimes	Solution, C++, Java, Go	Hard
1765	Map of Highest Peak	Solution, C++, Java, Go	Medium
1764	Form Array by Concatenating Subarrays of Another Array	Solution, C++, Java, Go	Medium
1763	Longest Nice Substring	Solution, C++, Java, Go	Easy
1761	Minimum Degree of a Connected Trio in a Graph	Solution, C++, Java, Go	Hard
1760	Minimum Limit of Balls in a Bag	Solution, C++, Java, Go	Medium
1759	Count Number of Homogenous Substrings	Solution, C++, Java, Go	Medium
1758	Minimum Changes To Make Alternating Binary String	Solution, C++, Java, Go	Easy
1755	Closest Subsequence Sum	Solution, C++, Java, Go	Hard
1754	Largest Merge Of Two Strings	Solution, C++, Java, Go	Medium
1753	Maximum Score From Removing Stones	Solution, C++, Java, Go	Medium
1752	Check if Array Is Sorted and Rotated	Solution, C++, Java, Go	Easy
1751	Maximum Number of Events That Can Be Attended II	Solution, C++, Java, Go	Hard
1750	Minimum Length of String After Deleting Similar Ends	Solution, C++, Java, Go	Medium
1749	Maximum Absolute Sum of Any Subarray	Solution, C++, Java, Go	Medium
1748	Sum of Unique Elements	Solution, C++, Java, Go	Easy
1743	Restore the Array From Adjacent Pairs	Solution, C++, Java, Go	Medium
1742	Maximum Number of Balls in a Box	Solution, C++, Java, Go	Easy
1739	Building Boxes	Solution, C++, Java, Go	Hard
1738	Find Kth Largest XOR Coordinate Value	Solution, C++, Java, Go	Medium
1736	Latest Time by Replacing Hidden Digits	Solution, C++, Java, Go	Easy
1734	Decode XORed Permutation	Solution, C++, Java, Go	Medium
1733	Minimum Number of People to Teach	Solution, C++, Java, Go	Medium
1732	Find the Highest Altitude	Solution, C++, Java, Go	Easy
1727	Largest Submatrix With Rearrangements	Solution, C++, Java, Go	Medium
1726	Tuple with Same Product	Solution, C++, Java, Go	Medium
1725	Number Of Rectangles That Can Form The Largest Square	Solution, C++, Java, Go	Easy
1718	Construct the Lexicographically Largest Valid Sequence	Solution, C++, Java, Go	Medium
1717	Maximum Score From Removing Substrings	Solution, C++, Java, Go	Medium
1716	Calculate Money in Leetcode Bank	Solution, C++, Java, Go	Easy
1711	Count Good Meals	Solution, C++, Java, Go	Medium
1710	Maximum Units on a Truck	Solution, C++, Java, Go	Easy
1625	Lexicographically Smallest String After Applying Operations	Solution, C++, Java, Go	Medium
1624	Largest Substring Between Two Equal Characters	Solution, C++, Java, Go	Easy
1605	Find Valid Matrix Given Row and Column Sums	Solution, C++, Java, Go	Medium
1573	Number of Ways to Split a String	Solution, C++, Java, Go	Medium
1556	Thousand Separator	Solution, C++, Java, Go	Easy
1551	Minimum Operations to Make Array Equal	Solution, C++, Java, Go	Medium
1550	Three Consecutive Odds	Solution, C++, Java, Go	Easy
1541	Minimum Insertions to Balance a Parentheses String	Solution, C++, Java, Go	Medium
1535	Find the Winner of an Array Game	Solution, C++, Java, Go	Medium
1529	Bulb Switcher IV	Solution, C++, Java, Go	Medium
1528	Shuffle String	Solution, C++, Java, Go	Easy
1525	Number of Good Ways to Split a String	Solution, C++, Java, Go	Medium
1524	Number of Sub-arrays With Odd Sum	Solution, C++, Java, Go	Medium
1523	Count Odd Numbers in an Interval Range	Solution, C++, Java, Go	Easy
1513	Number of Substrings With Only 1s	Solution, C++, Java, Go	Medium
1470	Shuffle the Array	Solution, C++, Java, Go	Easy
1464	Maximum Product of Two Elements in an Array	Solution, C++, Java, Go	Easy
1460	Make Two Arrays Equal by Reversing Sub-arrays	Solution, C++, Java, Go	Easy
1376	Time Needed to Inform All Employees	Solution, C++, Java, Go	Medium
1375	Bulb Switcher III	Solution, C++, Java, Go	Medium
1353	Maximum Number of Events That Can Be Attended	Solution, C++, Java, Go	Medium
1333	Filter Restaurants by Vegan-Friendly, Price and Distance	Solution, C++, Java, Go	Medium
1207	Unique Number of Occurrences	Solution, C++, Java, Go	Easy
1170	Compare Strings by Frequency of the Smallest Character	Solution, C++, Java, Go	Easy
1071	Greatest Common Divisor of Strings	Solution, C++, Java, Go	Easy
1030	Matrix Cells in Distance Order	Solution, C++, Java, Go	Easy
1029	Two City Scheduling	Solution, C++, Java, Go	Easy
1028	Recover a Tree From Preorder Traversal	Solution, C++, Java, Go	Hard
1024	Video Stitching	Solution, C++, Java, Go	Medium
993	Cousins in Binary Tree	Solution, C++, Java, Go	Easy
991	Broken Calculator	Solution, C++, Java, Go	Medium
990	Satisfiability of Equality Equations	Solution, C++, Java, Go	Medium
989	Add to Array-Form of Integer	Solution, C++, Java, Go	Easy
988	Smallest String Starting From Leaf	Solution, C++, Java, Go	Medium
987	Vertical Order Traversal of a Binary Tree	Solution, C++, Java, Go	Medium
986	Interval List Intersections	Solution, C++, Java, Go	Medium
985	Sum of Even Numbers After Queries	Solution, C++, Java, Go	Easy
984	String Without AAA or BBB	Solution, C++, Java, Go	Easy
983	Minimum Cost For Tickets	Solution, C++, Java, Go	Medium
982	Triples with Bitwise AND Equal To Zero	Solution, C++, Java, Go	Hard
981	Time Based Key-Value Store	Solution, C++, Java, Go	Medium
980	Unique Paths III	Solution, C++, Java,Python, Go,Python	Hard
979	Distribute Coins in Binary Tree	Solution, C++, Java, Go	Medium
978	Longest Turbulent Subarray	Solution, C++, Java,Python, Go,Python	Medium
977	Squares of a Sorted Array	Solution, C++, Java, Python, Go, Python	Easy
976	Largest Perimeter Triangle	Solution, C++, Java, Python, Go, Python	Easy
971	Flip Binary Tree To Match Preorder Traversal	Python	Medium
969	Pancake Sorting	Python	Medium
961	N-Repeated element in size 2N Array	Solution, C++, Java, Go	Easy
958	Check Completeness of a Binary Tree	Python	Medium
951	Flip Equivalent Binary Trees	Python	Medium
950	Reveal Cards In Increasing Order	Python	Medium
941	Valid Mountain Array	Python	Easy
933	Number of Recent Calls	Solution, C++, Java, Go	Easy
931	Minimum Falling Path Sum	Solution, C++, Java, Go	Medium
929	Unique Email Addresses	Solution, C++, Java, Go	Easy
922	Sort Array By Parity II	Solution, C++, Java, Go	Easy
914	X of a Kind in a Deck of Cards	Python	Easy
905	Sort Array By Parity	Solution, C++, Java, Go	Easy
876	Middle of the Linked List	Python	Easy
859	Buddy Strings	Solution, C++, Java, Go	Easy
858	Mirror Reflection	Solution, C++, Java, Go	Medium
852	Peak Index in a Mountain Array	Solution, C++, Java, Go	Easy
849	Maximize Distance to Closest Person	Python	Easy
844	Backspace String Compare	Solution, C++, Java, Go	Easy
837	Most Common Word	Solution, C++, Java, Go	Easy
830	Positions of Large Groups	Python	Easy
820	Short Encoding of Words	Solution, C++, Java, Go	Medium
804	Unique Morse Code Words	Solution, C++, Java, Go	Easy
771	Jewels and Stones	Solution, C++, Java, Go	Easy
747	Largest Number At Least Twice of Others	Python	Easy
746	Min Cost Climbing Stairs	Solution, C++, Java, Python, Go, Python	Easy
721	Accounts Merge	Solution, C++, Java, Go	Medium
717	1-bit and 2-bit Characters	Python	Easy
714	Best Time to Buy and Sell Stock with Transaction Fee	Solution, C++, Java, Go	Medium
712	Minimum ASCII Delete Sum for Two Strings	Solution, C++, Java, Go	Medium
695	Max Area of Island	Solution, C++, Java, Go	Medium
687	Longest Univalue Path	Python	Easy
684	Redundant Connection	Python	Medium
674	Longest Continuous Increasing Subsequence	Python	Easy
672	Bulb Switcher II	Solution, C++, Java, Go	Medium
671	Second Minimum Node In a Binary Tree	Python	Easy
665	Non-decreasing Array	Python	Easy
662	Maximum Width of Binary Tree	Python	Medium
661	Image Smoother	Python	Easy
655	Print Binary Tree	Python	Medium
652	Find Duplicate Subtrees	Python	Medium
647	Palindromic Substrings	Solution, C++, Java, Go	Medium
643	Maximum Average Subarray I	Solution, C++, Java, Python, Go, Python	Easy
628	Maximum Product of Three Numbers	Python	Easy
623	Add One Row to Tree	Python	Medium
581	Shortest Unsorted Continuous Subarray	Python	Easy
572	Subtree of Another Tree	Python	Easy
563	Binary Tree Tilt	Python	Easy
547	Friend Circles	Solution, C++, Java, Go	Medium
543	Diameter of Binary Tree	Python	Easy
538	Convert BST to Greater Tree	Python	Easy
532	K-diff Pairs in an Array	Python	Easy
520	Detect Capital	Solution, C++, Java, Go	Easy
518	Coin Change 2	Solution, C++, Java, Go	Medium
516	Longest Palindromic Subsequence	Solution, C++, Java, Go	Medium
509	Fibonacci Number	Solution, C++, Java, Python, Go, Python	Easy
497	Random Point in Non-overlapping Rectangles	Solution, C++, Java, Go	Medium
494	Target Sum	Solution, C++, Java, Go	Medium
477	Total Hamming Distance	Solution, C++, Java, Go	Medium
463	Island Perimeter	Solution, C++, Java, Go	Easy
450	DeleteNodeInABST	Python	Medium
449	Serialize and Deserialize BST	Python	Medium
438	Find all Anagrams in a string	Solution, C++, Java, Go	Medium
437	Path Sum III	Python	Medium
418	SentenceScreenFitting 🔒	Solution, C++, Java, Go	Easy
416	Partition Equal Subset Sum	Solution, C++, Java, Go	Medium
415	Add Strings	Solution, C++, Java, Go	Easy
414	Third Maximum Number	Solution, C++, Java, Python, Go, Python	Easy
413	Arithmetic Slices	Solution, C++, Java, Go	Medium
412	Fizz Buzz	Solution, C++, Java, Go	Easy
410	Split Array Largest Sum	Solution, C++, Java, Go	Hard
409	Longest Palindrome	Solution, C++, Java, Go	Easy
406	Queue Reconstruction by Height	Solution, C++, Java, Go	Medium
405	Convert a Number to Hexadecimal	Solution, C++, Java, Go	Easy
404	Sum of Left Leaves	Solution, C++, Java, Python, Go, Python	Easy
403	Frog Jump	Solution, C++, Java, Go	Hard
402	Remove K Digits	Solution, C++, Java, Go	Medium
401	Binary Watch	Solution, C++, Java, Go	Easy
400	Nth Digit	Solution, C++, Java, Go	Medium
399	Evaluate Division	Solution, C++, Java, Go	Medium
398	Random Pick Index	Solution, C++, Java, Go	Medium
397	Integer Replacement	Solution, C++, Java, Go	Medium
396	Rotate Function	Solution, C++, Java, Go	Easy
395	Longest Substring with At Least K Repeating Characters	Solution, C++, Java, Go	Medium
394	Decode String	Solution, C++, Java, Go	Medium
393	UTF-8 Validation	Solution, C++, Java, Go	Medium
392	Is Subsequence	Solution, C++, Java, Go	Medium
391	Perfect Rectangle	Solution, C++, Java, Go	Hard
390	Elimination Game	Solution, C++, Java, Go	Medium
389	Find the Difference	Solution, C++, Java, Go	Easy
388	Longest Absolute File Path	Solution, C++, Java, Go	Medium
387	First Unique Character in a String	Solution, C++, Java, Go	Easy
386	Lexicographical Numbers	Solution, C++, Java, Go	Medium
385	Mini Parser	Solution, C++, Java, Go	Medium
384	Shuffle an Array	Solution, C++, Java, Go	Medium
383	Ransom Note	Solution, C++, Java, Go	Easy
382	Linked List Random Node	Solution, C++, Java, Go	Medium
381	Insert Delete GetRandom O(1) - Duplicates allowed	Solution, C++, Java, Go	Hard
380	Insert Delete GetRandom O(1)	Solution, C++, Java, Go	Hard
377	Combination Sum IV	Solution, C++, Java, Go	Medium
376	Wiggle Subsequence	Solution, C++, Java, Go	Medium
371	Sum of Two Integers	Solution, C++, Java, Go	Easy
367	Valid Perfect Square	Solution, C++, Java, Go	Easy
357	Count Numbers with Unique Digits	Solution, C++, Java, Go	Medium
350	Intersection of Two Arrays II	Solution, C++, Java, Go	Easy
349	Intersection of Two Arrays	Solution, C++, Java, Go	Easy
347	Top K Frequent Elements	Solution, C++, Java, Go	Medium
345	Reverse Vowels of a String	Solution, C++, Java, Go	Easy
344	Reverse String	Solution, C++, Java, Go	Easy
343	Integer Break	Solution, C++, Java, Go	Medium
342	Power of Four	Solution, C++, Java, Go	Easy
341	Flatten Nested List Iterator	Solution, C++, Java, Go	Medium
338	Counting Bits	Solution, C++, Java, Go	Medium
337	House Robber III	Solution, C++, Java, Python, Go, Python	Medium
336	Palindrome Pairs	Solution, C++, Java, Go	Hard
334	Increasing Triplet Subsequence	Solution, C++, Java, Go	Medium
332	Reconstruct Itinerary	Solution, C++, Java, Go	Medium
331	Verify Preorder Serialization of a Binary Tree	Solution, C++, Java, Go	Medium
330	Patching Array	Solution, C++, Java, Go	Medium
329	Longest Increasing Path in a Matrix	Solution, C++, Java, Go	Medium
328	Odd Even Linked List	Solution, C++, Java, Go	Easy
327	Count of Range Sum	Solution, C++, Java, Go	Hard
326	Power of Three	Solution, C++, Java, Go	Easy
324	Wiggle Sort II	Solution, C++, Java, Go	Medium
322	Coin Change	Solution, C++, Java, Go	Medium
321	Create Maximum Number	Solution, C++, Java, Go	Hard
319	Bulb Switcher	Solution, C++, Java, Go	Medium
318	Maximum Product of Word Lengths	Solution, C++, Java, Go	Medium
316	Remove Duplicate Letters	Solution, C++, Java, Go	Hard
315	Count of Smaller Numbers After Self	Solution, C++, Java, Go	Hard
313	Super Ugly Number	Solution, C++, Java, Go	Medium
312	Burst Balloons	Solution, C++, Java, Go	Hard
310	Minimum Height Trees	Solution, C++, Java, Go	Medium
309	Best Time to Buy and Sell Stock with Cooldown	Solution, C++, Java, Go	Medium
307	Range Sum Query - Mutable	Solution, C++, Java, Go	Medium
306	Additive Number	Solution, C++, Java, Go	Medium
304	Range Sum Query 2D - Immutable	Solution, C++, Java, Go	Medium
303	Range Sum Query - Immutable	Solution, C++, Java, Go	Easy
301	Remove Invalid Parentheses	Solution, C++, Java, Go	Hard
300	Longest Increasing Subsequence	Solution, C++, Java, Go	Medium
299	Bulls and Cows	Solution, C++, Java, Go	Easy
297	Serialize and Deserialize Binary Tree	Solution, C++, Java, Go	Medium
295	Find Median from Data Stream	Solution, C++, Java, Go	Hard
292	Nim Game	Solution, C++, Java, Go	Easy
290	Word Pattern	Solution, C++, Java, Go	Easy
289	Game of Life	Solution, C++, Java, Go	Medium
287	Find the Duplicate Number	Solution, C++, Java, Python, Go, Python	Hard
285	Inorder Successor in BST 🔒	Java, Go	Medium
284	Peeking Iterator	Solution, C++, Java, Go	Medium
283	Move Zeroes	Solution, C++, Java, Go	Easy
282	Expression Add Operators	Solution, C++, Java, Go	Hard
279	Perfect Squares	Solution, C++, Java, Go	Medium
278	First Bad Version	Solution, C++, Java, Java, Go, Java	Easy
275	H-Index II	Solution, C++, Java, Go	Medium
274	H-Index	Solution, C++, Java, Go	Medium
273	Integer to English Words	Solution, C++, Java, Go	Medium
268	Missing Number	Solution, C++, Java, Go	Medium
264	Ugly Number II	Solution, C++, Java, Go	Medium
263	Ugly Number	Solution, C++, Java, Go	Easy
260	Single Number III	Solution, C++, Java, Go	Medium
258	Add Digits	Solution, C++, Java, Go	Easy
257	Binary Tree Paths	Solution, C++, Java, Go	Easy
242	Valid Anagram	Solution, C++, Java, Java, Go, Java	Easy
241	Different Ways to Add Parentheses	Solution, C++, Java, Python, Go, Python	Medium
240	Search a 2D Matrix II	Solution, C++, Java, Java, Python, Go, Java, Python	Medium
239	Sliding Window Maximum	Solution, C++, Java, Go	Hard
238	Product of Array Except Self	Solution, C++, Java, Go	Medium
237	Delete Node in a Linked List	Solution, C++, Java, Go	Easy
236	Lowest Common Ancestor of a Binary Tree	Solution, C++, Java, Java, Python, Go, Java, Python	Medium
235	Lowest Common Ancestor of a Binary Search Tree	Solution, C++, Java, Python, Go, Python	Easy
234	Palindrome Linked List	Solution, C++, Java, Go	Easy
233	Number of Digit One	Solution, C++, Java, Go	Medium
232	Implement Queue using Stacks	Solution, C++, Java, Java, Go, Java	Easy
231	Power of Two	Solution, C++, Java, Go	Easy
230	Kth Smallest Element in a BST	Solution, C++, Java, Python, Go, Python	Medium
229	Majority Element II	Solution, C++, Java, Go	Medium
228	Summary Ranges	Solution, C++, Java, Go	Easy
227	Basic Calculator II	Solution, C++, Java, Go	Medium
226	Invert Binary Tree	Solution, C++, Java, Go	Easy
225	Implement Stack using Queues	Solution, C++, Java, Java, Go, Java	Medium
224	Basic Calculator	Solution, C++, Java, Go	Medium
223	Rectangle Area	Solution, C++, Java, Go	Easy
222	Count Complete Tree Nodes	Solution, C++, Java, Python, Go, Python	Medium
221	Maximal Square	Solution, C++, Java, Go	Medium
220	Contains Duplicate III	Solution, C++, Java, Python, Go, Python	Medium
219	Contains Duplicate II	Solution, C++, Java, Python, Go, Python	Easy
218	The Skyline Problem	Solution, C++, Java, Go	Hard
217	Contains Duplicate	Solution, C++, Java, Go	Easy
216	Combination Sum III	Solution, C++, Java, Go	Medium
215	Kth Largest Element in an Array	Solution, C++, Java, Go	Medium
214	Shortest Palindrome	Solution, C++, Java, Go	Hard
213	House Robber II	Solution, C++, Java, Go	Medium
212	Word Search II	Solution, C++, Java, Go	Hard
211	Add and Search Word - Data structure design	Solution, C++, Java, Go	Medium
210	Course Schedule II	Solution, C++, Java, Go	Medium
209	Minimum Size Subarray Sum	Solution, C++, Java, Go	Medium
208	Implement Trie (Prefix Tree)	Solution, C++, Java, Go	Medium
207	Course Schedule	Solution, C++, Java, Go	Medium
206	Reverse Linked List	Solution, C++, Java, Java, Go, Java	Easy
205	Isomorphic Strings	Solution, C++, Java, Go	Easy
204	Count Primes	Solution, C++, Java, Go	Easy
203	Remove Linked List Elements	Solution, C++, Java, Go	Easy
202	Happy Number	Solution, C++, Java, Python, Go, Python	Easy
201	Bitwise AND of Numbers Range	Solution, C++, Java, Go	Medium
200	Number of Islands	Solution, C++, Java, Python, Go, Python	Medium
199	Binary Tree Right Side View	Solution, C++, Java, Go	Medium
198	House Robber	Solution, C++, Java, Python, Go, Python	Easy
191	Number of 1 Bits	Solution, C++, Java, Go	Easy
190	Reverse Bits	Solution, C++, Java, Go	Easy
189	Rotate Array	Solution, C++, Java, Java, Go, Java	Easy
188	Best Time to Buy and Sell Stock IV	Solution, C++, Java, Go	Hard
187	Repeated DNA Sequences	Solution, C++, Java, Go	Medium
186	Reverse Words in a String II 🔒	Solution, C++, Java, Go	Medium
179	Largest Number	Solution, C++, Java, Go	Medium
174	Dungeon Game	Solution, C++, Java, Go	Hard
173	Binary Search Tree Iterator	Solution, C++, Java, Java, Python, Go, Java, Python	Medium
172	Factorial Trailing Zeroes	Solution, C++, Java, Go	Easy
171	Excel Sheet Column Number	Solution, C++, Java, Go	Easy
170	Two Sum III - Data structure design 🔒	Solution, C++, Java, Go	Easy
169	Majority Element	Solution, C++, Java, Go	Easy
168	Excel Sheet Column Title	Solution, C++, Java, Go	Easy
167	Two Sum II - Input array is sorted 🔒	Solution, C++, Java, Go	Medium
166	Fraction to Recurring Decimal	Solution, C++, Java, Go	Medium
165	Compare Version Numbers	Solution, C++, Java, Go	Easy
164	Maximum Gap	Solution, C++, Java, Go	Hard
163	Missing Ranges 🔒	Solution, C++, Java, Go	Medium
162	Find Peak Element	Solution, C++, Java, Java, Go, Java	Medium
161	One Edit Distance🔒	Solution, C++, Java, Go	Medium
160	Intersection of Two Linked Lists	Solution, C++, Java, Go	Easy
159	Longest Substring with At Most Two Distinct Characters 🔒	Solution, C++, Java, Go	Hard
158	Read N Characters Given Read4 II - Call multiple times 🔒	Solution, C++, Java, Go	Hard
157	Read N Characters Given Read4 🔒	Solution, C++, Java, Go	Easy
156	Binary Tree Upside Down 🔒	Solution, C++, Java, Go	Medium
155	Min Stack	Solution, C++, Java, Java, Go, Java	Easy
154	Find Minimum in Rotated Sorted Array II	Solution, C++, Java, Go	Hard
153	Find Minimum in Rotated Sorted Array	Solution, C++, Java, Java, Go, Java	Medium
152	Maximum Product Subarray	Solution, C++, Java, Go	Medium
151	Reverse Words in a String	Solution, C++, Java, Java, Go, Java	Medium
150	Evaluate Reverse Polish Notation	Solution, C++, Java, Go	Medium
149	Max Points on a Line	Solution, C++, Java, Go	Hard
148	Sort List	Solution, C++, Java, Python, Go, Python	Medium
147	Insertion Sort List	Solution, C++, Java, Python, Go, Python	Medium
146	LRU Cache	Solution, C++, Java, Java, Go, Java	Hard
145	Binary Tree Postorder Traversal	Solution, C++, Java, Python, Go, Python	Hard
144	Binary Tree Preorder Traversal	Solution, C++, Java, Java, Go, Java	Medium
143	Reorder List	Solution, C++, Java, Python, Go, Python	Medium
142	Linked List Cycle II	Solution, C++, Java, Python, Go, Python	Medium
141	Linked List Cycle	Solution, C++, Java, Go	Medium
140	Word Break II	Solution, C++, Java, Go	Hard
139	Word Break	Solution, C++, Java, Go	Medium
138	Copy List with Random Pointer	Solution, C++, Java, Python, Go, Python	Hard
137	Single Number II	Solution, C++, Java, Go	Medium
136	Single Number	Solution, C++, Java, Go	Medium
135	Candy	Solution, C++, Java, Go	Hard
134	Gas Station	Solution, C++, Java, Go	Medium
133	Clone Graph	Solution, C++, Java, Go	Medium
132	Palindrome Partitioning II	Solution, C++, Java, Go	Hard
131	Palindrome Partitioning	Solution, C++, Java, Go	Medium
130	Surrounded Regions	Solution, C++, Java, Go	Medium
129	Sum Root to Leaf Numbers	Solution, C++, Java, Python, Go, Python	Medium
128	Longest Consecutive Sequence	Solution, C++, Java, Go	Hard
127	Word Ladder	Solution, C++, Java, Go	Medium
126	Word Ladder II	Solution, C++, Java, Go	Hard
125	Valid Palindrome	Solution, C++, Java, Java, Go, Java	Easy
124	Binary Tree Maximum Path Sum	Solution, C++, Java, Java, Go, Java	Hard
123	Best Time to Buy and Sell Stock III	Solution, C++, Java, Go	Hard
122	Best Time to Buy and Sell Stock II	Solution, C++, Java, Go	Medium
121	Best Time to Buy and Sell Stock	Solution, C++, Java, Go	Medium
120	Triangle	Solution, C++, Java, Java, Go, Java	Medium
119	Pascal's Triangle II	Solution, C++, Java, Go	Easy
118	Pascal's Triangle	Solution, C++, Java, Go	Easy
117	Populating Next Right Pointers in Each Node II	Solution, C++, Java, Python, Go, Python	Hard
116	Populating Next Right Pointers in Each Node	Solution, C++, Java, Python, Go, Python	Medium
115	Distinct Subsequences	Solution, C++, Java, Go	Hard
114	Flatten Binary Tree to Linked List	Solution, C++, Java, Python, Go, Python	Medium
113	Path Sum II	Solution, C++, Java, Python, Go, Python	Medium
112	Path Sum	Solution, C++, Java, Go	Easy
111	Minimum Depth of Binary Tree	Solution, C++, Java, Go	Easy
110	Balanced Binary Tree	Solution, C++, Java, Java, Go, Java	Easy
109	Convert Sorted List to Binary Search Tree	Solution, C++, Java, Go	Medium
108	Convert Sorted Array to Binary Search Tree	Solution, C++, Java, Go	Medium
107	Binary Tree Level Order Traversal II	Solution, C++, Java, Go	Easy
106	Construct Binary Tree from Inorder and Postorder Traversal	Solution, C++, Java, Python, Go, Python	Medium
105	Construct Binary Tree from Preorder and Inorder Traversal	Solution, C++, Java, Python, Go, Python	Medium
104	Maximum Depth of Binary Tree	Solution, C++, Java, Java, Go, Java	Easy
103	Binary Tree Zigzag Level Order Traversal	Solution, C++, Java, Python, Go, Python	Medium
102	Binary Tree Level Order Traversal	Solution, C++, Java, Java, Go, Java	Easy
101	Symmetric Tree	Solution, C++, Java, Go	Easy
100	Same Tree	Solution, C++, Java, Go	Easy
99	Recover Binary Search Tree	Solution, C++, Java, Go	Hard
98	Validate Binary Search Tree	Solution, C++, Java, Java, Python, Go, Java, Python	Medium
97	Interleaving String	Solution, C++, Java, Go	Hard
96	Unique Binary Search Trees	Solution, C++, Java, Python, Go, Python	Medium
95	Unique Binary Search Trees II	Solution, C++, Java, Python, Go, Python	Medium
94	Binary Tree Inorder Traversal	Solution, C++, Java, Go	Medium
93	Restore IP Addresses	Solution, C++, Java, Go	Medium
92	Reverse Linked List II	Solution, C++, Java, Java, Python, Go, Java, Python	Medium
91	Decode Ways	Solution, C++, Java, Go	Medium
90	Subsets II	Solution, C++, Java, Java, Go, Java	Medium
89	Gray Code	Solution, C++, Java, Go	Medium
88	Merge Sorted Array	Solution, C++, Java, Go	Easy
87	Scramble String	Solution, C++, Java, Go	Hard
86	Partition List	Solution, C++, Java, Python, Go, Python	Medium
85	Maximal Rectangle	Solution, C++, Java, Go	Hard
84	Largest Rectangle in Histogram	Solution, C++, Java, Go	Hard
83	Remove Duplicates from Sorted List	Solution, C++, Java, Go	Easy
82	Remove Duplicates from Sorted List II	Solution, C++, Java, Python, Go, Python	Medium
81	Search in Rotated Sorted Array II	Solution, C++, Java, Go	Medium
80	Remove Duplicates from Sorted Array II	Solution, C++, Java, Go	Medium
79	Word Search	Solution, C++, Java, Go	Medium
78	Subsets	Solution, C++, Java, Java, Python, Go, Java, Python	Medium
77	Combinations	Solution, C++, Java, Go	Medium
76	Minimum Window Substring	Solution, C++, Java, Go	Hard
75	Sort Colors	Solution, C++, Java, Go	Medium
74	Search a 2D Matrix	Solution, C++, Java, Java, Go, Java	Medium
73	Set Matrix Zeroes	Solution, C++, Java, Go	Medium
72	Edit Distance	Solution, C++, Java, Go	Hard
71	Simplify Path	Solution, C++, Java, Go	Medium
70	Climbing Stairs	Solution, C++, Java, Java, Go, Java	Easy
69	Sqrt(x)	Solution, C++, Java, Go	Medium
68	Text Justification	Solution, C++, Java, Go	Hard
67	Add Binary	Solution, C++, Java, Go	Easy
66	Plus One	Solution, C++, Java, Go	Easy
65	Valid Number	Solution, C++, Java, Go	Easy
64	Minimum Path Sum	Solution, C++, Java, Java, Go, Java	Medium
63	Unique Paths II	Solution, C++, Java, Java, Go, Java	Medium
62	Unique Paths	Solution, C++, Java, Java, Go, Java	Medium
61	Rotate List	Solution, C++, Java, Go	Medium
60	Permutation Sequence	Solution, C++, Java, Go	Medium
59	Spiral Matrix II	Solution, C++, Java, Go	Medium
58	Length of Last Word	Solution, C++, Java, Java, Go, Java	Easy
57	Insert Interval	Solution, C++, Java, Go	Hard
56	Merge Intervals	Solution, C++, Java, Go	Hard
55	Jump Game	Solution, C++, Java, Python, Go, Python	Medium
54	Spiral Matrix	Solution, C++, Java, Go	Medium
53	Maximum Subarray	Solution, C++, Java, Java, Go, Java	Medium
52	N-Queens II	Solution, C++, Java, Go	Hard
51	N-Queens	Solution, C++, Java, Go	Hard
50	"Pow(x, n)"	Solution, C++, Java, Java, Go, Java	Medium
49	Group Anagrams	Solution, C++, Java, Go	Medium
48	Rotate Image	Solution, C++, Java, Go	Medium
47	Permutations II	Solution, C++, Java, Go	Hard
46	Permutations	Solution, C++, Java, Go	Medium
45	Jump Game II	Solution, C++, Java, Go	Hard
44	Wildcard Matching	Solution, C++, Java, Go	Hard
43	Multiply Strings	Solution, C++, Java, Go	Medium
42	Trapping Rain Water	Solution, C++, Java, Go	Hard
41	First Missing Positive	Solution, C++, Java, Python, Go, Python	Hard
40	Combination Sum II	Solution, C++, Java, Go	Medium
39	Combination Sum	Solution, C++, Java, Go	Medium
38	Count and Say	Solution, C++, Java, Java, Go, Java	Easy
37	Sudoku Solver	Solution, C++, Java, Go	Hard
36	Valid Sudoku	Solution, C++, Java, Go	Easy
35	Search Insert Position	Solution, C++, Java, Java, Go, Java	Medium
34	Search for a Range	Solution, C++, Java, Java, Go, Java	Medium
33	Search in Rotated Sorted Array	Solution, C++, Java, Java, Go, Java	Hard
32	Longest Valid Parentheses	Solution, C++, Java, Go	Hard
31	Next Permutation	Solution, C++, Java, Go	Medium
30	Substring with Concatenation of All Words	Solution, C++, Java, Go	Hard
29	Divide Two Integers	Solution, C++, Java, Go	Medium
28	Implement strStr()	Solution, C++, Java, Java, Go, Java	Easy
27	Remove Element	Solution, C++, Java, Go	Easy
26	Remove Duplicates from Sorted Array	Solution, C++, Java, Java, Go, Java	Easy
25	Reverse Nodes in k-Group	Solution, C++, Java, Go	Hard
24	Swap Nodes in Pairs	Solution, C++, Java, Go	Medium
23	Merge k Sorted Lists	Solution, C++, Java, Go	Hard
22	Generate Parentheses	Solution, C++, Java, Go	Medium
21	Merge Two Sorted Lists	Solution, C++, Java, Go	Easy
20	Valid Parentheses	Solution, C++, Java, Go	Easy
19	Remove Nth Node From End of List	Solution, C++, Java, Python, Go, Python	Easy
18	4Sum	Solution, C++, Java, Go	Medium
17	Letter Combinations of a Phone Number	Solution, C++, Java, Go	Medium
16	3Sum Closest	Solution, C++, Java, Go	Medium
15	3Sum	Solution, C++, Java, Go	Medium
14	Longest Common Prefix	Solution, C++, Java, Go	Easy
13	Roman to Integer	Solution, C++, Java, Go	Easy
12	Integer to Roman	Solution, C++, Java, Go	Medium
11	Container With Most Water	Solution, C++, Java, Java, Go, Java	Medium
10	Regular Expression Matching	Solution, C++, Java, Go	Hard
9	Palindrome Number	Solution, C++, Java, Java, Go, Java	Easy
8	String to Integer (atoi)	Solution, C++, Java, Go	Easy
7	Reverse Integer	Solution, C++, Java, Go	Easy
6	ZigZag Conversion	Solution, C++, Java, Go	Easy
5	Longest Palindromic Substring	Solution, C++, Java, Go	Medium
4	Median of Two Sorted Arrays	Solution, C++, Java, Go	Hard
3	Longest Substring Without Repeating Characters	Solution, C++, Java, Go	Medium
2	Add Two Numbers	Solution, C++, Java, Go	Medium
1	Two Sum	Solution, C++, Java, Go	Easy

LeetCode Shell

#	Title	Solution	Difficulty
4	Tenth Line	Bash	Easy
3	Transpose File	Bash	Medium
2	Valid Phone Numbers	Bash	Easy
1	Word Frequency	Bash	Medium

LintCode

#	Title	Solution	Difficulty
1	Search in a big sorted array	Java, Go	Medium
2	Search Range in Binary Search Tree	Java, Go	Medium