LeetCode

📚This repository consists of some leetcode problem solutions.
(Total solved problems : 851)

ID	Title	Level	Solution	Remark
0001	Two Sum	Easy	JavaScript / Python / Java / C++ / C / Rust
0002	Add Two Numbers	Medium	Python / C
0003	Longest Substring Without Repeating Characters	Mediun	Python / C
0004	Median of Two Sorted Arrays	Hard	JavaScript
0006	Zigzag Conversion	Medium	Python
0007	Reverse Integer	Medium	JavaScript / C++
0008	String to Integer (atoi)	Medium	Python
0009	Palindromem Number	Easy	JavaScript / Java
0011	Container With Most Water	Medium	Python
0012	Integer to Roman	Medium	Python
0013	Roman to Integer	Easy	JavaScript / Python
0014	Longest Common Prefix	Easy	JavaScript
0017	Letter Combinations of a Phone Number	Medium	Python
0020	Valid Parentheses	Easy	JavaScript / Python / C++
0021	Merge Two Sorted Lists	Easy	JavaScript
0026	Remove Duplicates from Sorted Array	Easy	JavaScript
0027	Remove Element	Easy	JavaScript
0028	Implement strStr()	Easy	JavaScript / C++
0031	Next Permutation	Medium	C
0033	Search in Rotated Sorted Array	Medium	Python	Binary Sreach
0034	Find First and Last Position of Element in Sorted Array	Easy	Python
0035	Search Insert Position	Easy	JavaScript / Python	Binary Sreach
0036	Valid Sudoku	Medium	Python
0038	Count and Say	Medium	Python
0041	First Missing Positive	Hard	Python
0045	Jump Game II	Medium	C
0046	Permutations	Medium	Python
0047	Permutations II	Medium	Python
0048	Rotate Image	Medium	Python
0049	Group Anagrams	Medium	Python
0050	Pow(x, n)	Medium	Python / C
0053	Maximum Subarray	Easy	JavaScript / Python / Java	Kadane's Algorithm
0054	Spiral Matrix	Medium	Python
0055	Jump Game	Medium	Python
0058	Length of Last Word	Easy	JavaScript
0060	Permutation Sequence	Hard	Python
0061	Rotate List	Medium	Python
0062	Unique Paths	Easy	Python / JavaScript / PHP	*Mathematical Solution [1]
0065	Valid Number	Hard	Python	Regular Expression
0066	Plus One	Easy	JavaScript / Python / C++	*Built-in Function Solution [1]
0067	Add Binary	Easy	Python
0069	Sqrt(x)	Easy	JavaScript / Python / C	Binary Search
0070	Climbing Stairs	Easy	JavaScript / TyoeScript / PHP / Python / Java
0071	Simplify Path	Medium	Python / C++
0073	Set Matrix Zeroes	Medium	Python
0074	Search a 2D Matrix	Easy	Python / C
0075	Sort Colors	Medium	Python	Counting Sort
0077	Combinations	Medium	Python
0078	Subsets	Medium	Python
0080	Remove Duplicates from Sorted Array II	Medium	Python
0083	Remove Duplicates from Sorted List	Easy	Python
0088	Merge Sorted Array	Easy	Python
0089	Gray Code	Medium	Python
0090	Subsets II	Medium	Python
0092	Reverse Linked List II	Medium	Python
0094	Binary Tree Inorder Traversal	Easy	Python / C	Depth-First Search
0098	Validate Binary Search Tree	Medium	Python	BST, Inorder Traversal
0100	Same Tree	Easy	JavaScript / Python
0101	Symmetric Tree	Easy	Python	Tree
0102	Binary Tree Level Order Traversal	Medium	Python
0104	Maximum Depth of Binary Tree	Easy	Python	Depth-First Search, Tree
0107	Binary Tree Level Order Traversal II	Medium	Python
0108	Convert Sorted Array to Binary Search Tree	Easy	Python
0110	Balanced Binary Tree	Easy	C++
0111	Minimum Depth of Binary Tree	Easy	Python	Depth-First Search, Tree
0112	Path Sum	Easy	Python
0113	Path Sum II	Medium	Python
0119	Pascal's Triangle II	Easy	Python
0121	Best Time to Buy and Sell Stock	Easy	Python / Java / C
0122	Best Time to Buy and Sell Stock II	Medium	Python / Java
0133	Clone Graph	Medium	Python
0136	Single Number	Easy	JavaScript / Java / C
0137	Single Number II	Medium	Python
0138	Copy List with Random Pointer	Medium	Python / Java
0144	Binary Tree Preorder Traversal	Easy	Python	Depth-First Search, Tree
0145	Binary Tree Postorder Traversal	Easy	Python	Depth-First Search, Tree
0146	LRU Cache	Medium	Python	*Built-in Function Solution [1]
0148	Sort List	Medium	C
0150	Evaluate Reverse Polish Notation	Medium	C++
0151	Reverse Words in a String	Easy	Python
0153	Find Minimum in Rotated Sorted Array	Medium	Python	Binary Sreach
0154	Find Minimum in Rotated Sorted Array II	Hard	Python
0155	Min Stack	Easy	Python
0162	Find Peak Element	Medium	Python
0167	Two Sum II - Input Array Is Sorted	Medium	JavaScript / Python / PHP
0168	Excel Sheet Column Title	Easy	C / C++
0169	Second Highest Salary	Easy	JavaScript
0171	Excel Sheet Column Number	Easy	Python
0175	Combine Two Tables	Easy	MySQL
0176	Second Highest Salary	Medium	MySQL
0177	Nth Highest Salary	Medium	MySQL
0181	Employees Earning More Than Their Managers	Easy	MySQL
0182	Duplicate Emails	Easy	MySQL
0183	Customers Who Never Order	Easy	MySQL
0184	Department Highest Salary	Medium	MySQL
0189	Rotate Array	Easy	Python
0190	Reverse Bits	Easy	JavaScript
0191	Number of 1 Bits	Easy	JavaScript / Python
0196	Delete Duplicate Emails	Easy	MySQL
0197	Rising Temperature	Easy	MySQL
0202	Happy Number	Easy	JavaScript / Python
0203	Remove Linked List Elements	Easy	Python / C++
0204	Count Primes	Medium	C	*Mathematical Solution [1]
0205	Isomorphic Strings	Easy	JavaScript / Python
0206	Reverse Linked List	Easy	Python
0209	Minimum Size Subarray Sum	Medium	C++
0215	Kth Largest Element in an Array	Medium	Python
0217	Contains Duplicate	Easy	JavaScript / Python / C++
0219	Contains Duplicate II	Easy	Python
0225	Implement Stack using Queues	Easy	Python
0226	Invert Binary Tree	Easy	Python
0228	Summary Ranges	Easy	Python
0229	Majority Element II	Medium	Python
0230	Kth Smallest Element in a BST	Medium	C / C++
0231	Power of Two	Easy	Python / Java / C
0232	Implement Queue using Stacks	Easy	Python
0234	Palindrome Linked List	Easy	Python
0235	Lowest Common Ancestor of a Binary Search Tree	Easy	Java
0237	Delete Node in a Linked List	Easy	Python
0238	Product of Array Except Self	Medium	Python
0242	Valid Anagram	Easy	Python
0257	Binary Tree Paths	Easy	Python
0258	Add Digits	Easy	Python
0260	Single Number III	Medium	Python
0263	Ugly Number	Easy	Python
0268	Missing Number	Easy	Python
0274	H-Index	Medium	Python
0275	H-Index II	Medium	Python
0278	First Bad Version	Easy	Python / TypeScript / Java / PHP /JavaScript	Binary Search
0283	Move Zeroes	Easy	Python
0287	Find the Duplicate Number	Medium	Python
0289	Game of Life	Mediunm	Python
0290	Word Pattern	Easy	Python
0292	Nim Game	Easy	Python
0295	Find Median from Data Stream	Hard	Python
0299	Bulls and Cows	Medium	Python
0303	Range Sum Query - Immutable	Easy	Python
0319	Bulb Switcher	Medium	Python
0326	Power of Three	Easy	Python
0342	Power of Four	Easy	JavaScript
0343	Integer Break	Medium	Python
0344	Reverse String	Easy	Python
0345	Reverse Vowels of a String	Easy	Python
0347	Top K Frequent Elements	Mediun	Python
0349	Intersection of Two Arrays	Easy	Python
0350	Intersection of Two Arrays II	Easy	Python
0365	Water and Jug Problem	Medium	C
0367	Valid Perfect Square	Easy	Python
0374	Guess Number Higher or Lower	Easy	Python	Binary Sreach
0378	Kth Smallest Element in a Sorted Matrix	Mediun	Python	*Built-in Function Solution [1]
0380	Insert Delete GetRandom O(1)	Mediun	Python
0383	Ransom Note	Easy	Python
0384	Shuffle an Array	Mediun	Python
0387	First Unique Character in a String	Easy	Python
0389	Find the Difference	Easy	Python
0392	Is Subsequence	Easy	Python
0398	Random Pick Index	Easy	Python
0404	Sum of Left Leaves	Easy	Python
0405	Convert a Number to Hexadecimal	Easy	Python
0409	Longest Palindrome	Easy	Python / Java
0412	Fizz Buzz	Easy	JavaScript
0415	Add Strings	Easy	JavaScript / Python	*Built-in Function Solution [1]
0419	Battleships in a Board	Medium	Python	Depth-First Search
0424	Longest Repeating Character Replacement	Medium	Python / JavaScript / Java / PHP
0434	Number of Segments in a String	Easy	Python
0438	Find All Anagrams in a String	Medium	Python	Sliding Window
0441	Arranging Coins	Easy	Python	Binary Search
0443	String Compression	Medium	Python
0445	Add Two Numbers II	Medium	Python
0448	Find All Numbers Disappeared in an Array	Easy	Python
0451	Sort Characters By Frequency	Medium	Python
0452	Minimum Number of Arrows to Burst Balloons	Medium	Python
0453	Minimum Moves to Equal Array Elements	Medium	Python / Java
0459	Repeated Substring Pattern	Easy	Python / C++
0461	Hamming Distance	Easy	Python / Java	Note Bitwise Operations on Integer Types
0470	Implement Rand10() Using Rand7()	Medium	Python
0476	LNumber Complement	Easy	Python
0482	License Key Formatting	Easy	Python
0485	Max Consecutive Ones	Easy	Python
0492	Construct the Rectangle	Easy	Python
0495	Teemo Attacking	Easy	Python
0496	Next Greater Element I	Easy	JavaScript / Python
0500	Keyboard Row	Easy	Python
0504	Base 7	Easy	Python
0506	Relative Ranks	Easy	Python
0507	Perfect Number	Easy	Python
0509	Fibonacci Number	Easy	Python / Java / JavaScript / TypeScript / PHP / C++
0511	Game Play Analysis I	Easy	Python
0520	Detect Capital	Easy	Python
0521	Longest Uncommon Subsequence I	Easy	Python
0530	Minimum Absolute Difference in BST	Easy	Python
0532	K-diff Pairs in an Array	Medium	Python
0535	Encode and Decode TinyURL	Medium	Python / C++
0537	Complex Number Multiplication	Medium	Python
0541	Reverse String II	Easy	Python
0551	Student Attendance Record I	Easy	MySQL
0557	Reverse Words in a String III	Easy	JavaScript / Python
0561	Array Partition I	Easy	JavaScript
0566	Reshape the Matrix	Easy	Python
0567	Permutation in String	Easy	Python
0575	Distribute Candies	Easy	Python
0577	Employee Bonus	Easy	MySQL
0584	Find Customer Referee	Easy	MySQL
0586	Customer Placing the Largest Number of Orders	Easy	MySQL
0589	N-ary Tree Preorder Traversal	Easy	Python	Tree
0590	N-ary Tree Postorder Traversal	Easy	Python	Tree
0593	Valid Square	Medium	Python
0595	Big Countries	Easy	MySQL
0596	Classes More Than 5 Students	Easy	MySQL
0599	Minimum Index Sum of Two Lists	Easy	Python
0605	Can Place Flowers	Easy	Python - C++
0606	Construct String from Binary Tree	Easy	Python
0607	Sales Person	Easy	MySQL
0610	Triangle Judgement	Easy	MySQL
0609	Find Duplicate File in System	Medium	Python
0620	Not Boring Movies	Easy	MySQL
0626	Exchange Seats	Medium	MySQL
0627	Swap Salary	Easy	MySQL
0633	Sum of Square Numbers	Medium	Python
0637	Average of Levels in Binary Tree	Easy	Python
0643	Maximum Average Subarray I	Easy	Python
0645	Set Mismatch	Easy	Python	Note Time Complexity
0650	2 Keys Keyboard	Medium	Python
0654	Maximum Binary Tree	Medium	C
0661	Image Smoother	Easy	Python
0657	Robot Return to Origin	Easy	Python
0670	Maximum Swap	Medium	Python
0674	Longest Continuous Increasing Subsequence	Easy	Python
0682	Baseball Game	Easy	Python
0684	Redundant Connection	Medium	Python
0692	Top K Frequent Words	Medium	Python
0693	Binary Number with Alternating Bits	Easy	Python
0695	Max Area of Island	Medium	Python	Depth-First Search
0696	Count Binary Substrings	Easy	Python / C++
0697	Degree of an Array	Easy	Python
0700	Search in a Binary Search Tree	Easy	Python
0701	Insert into a Binary Search Tree	Medium	C++
0704	Binary Search	Easy	Python / Java / C / C++	Binary Search
0705	Design HashSet	Easy	Python
0706	Design HashMap	Easy	Python
0707	Design Linked List	Medium	Python
0709	To Lower Case	Easy	JavaScript / Python
0724	Find Pivot Index	Easy	Python
0728	Self Dividing Numbers	Easy	JavaScript
0733	Flood Fill	Easy	Python / JavaScript / TyoeScript	Depth-First Search
0744	Find Smallest Letter Greater Than Target	Easy	Python / C
0746	Min Cost Climbing Stairs	Easy	Python	Dynamic programming
0747	Largest Number At Least Twice of Others	Easy	Python
0748	Shortest Completing Word	Easy	Python
0762	Prime Number of Set Bits in Binary Representation	Easy	Python
0763	Partition Labels	Medium	Python
0771	Jewels and Stones	Easy	JavaScript / Java / C++
0776	Toeplitz Matrix	Easy	Python
0779	K-th Symbol in Grammar	Medium	Python
0784	Letter Case Permutation	Medium	Python
0791	Custom Sort String	Medium	Python
0796	Rotate String	Easy	JavaScript
0804	Unique Morse Code Words	Easy	JavaScript
0806	Number of Lines To Write String	Easy	Python
0807	Max Increase to Keep City Skyline	Medium	Python
0811	Subdomain Visit Count	Medium	Python	Hash Table
0814	Binary Tree Pruning	Medium	C++
0819	Most Common Word	Easy	Python
0821	Shortest Distance to a Character	Easy	Python / Java
0824	Goat Latin	Easy	Python
0830	Positions of Large Groups	Easy	Python
0831	Masking Personal Information	Medium	Python
0832	Flipping an Image	Easy	JavaScript
0833	Projection Area of 3D Shapes	Easy	Python / Java
0836	Rectangle Overlap	Easy	Python
0841	Keys and Rooms	Easy	Python
0844	Backspace String Compare	Easy	JavaScript / Python
0852	Peak Index in a Mountain Array	Medium	Python / C	Binary Search
0859	Buddy Strings	Easy	Python / Rust
0860	Lemonade Change	Easy	Python
0867	Transpose Matrix	Easy	JavaScript
0868	Binary Gap	Easy	JavaScript
0869	Reordered Power of 2	Medium	Python
0872	Leaf-Similar Trees	Easy	Python
0876	Middle of the Linked List	Easy	Python
0881	Boats to Save People	Medium	C++
0884	Uncommon Words from Two Sentences	Easy	Python
0884	Uncommon Words from Two Sentences	Easy	Python
0888	Fair Candy Swap	Easy	JavaScript
0890	Find and Replace Pattern	Medium	Python
0896	Monotonic Array	Easy	JavaScript / C++
0905	Sort Array By Parity	Easy	JavaScript / Python
0908	Smallest Range I	Easy	Python
0912	Sort an Array	Medium	Python
0914	X of a Kind in a Deck of Cards	Easy	Python
0917	Reverse Only Letters	Easy	JavaScript
0921	Minimum Add to Make Parentheses Valid	Medium	Python
0922	Sort Array By Parity II	Easy	JavaScript
0925	Long Pressed Name	Easy	Python
0933	Number of Recent Calls	Easy	Python
0937	Reorder Data in Log Files	Easy	Python
0938	Valid Mountain Array	Easy	Python
0941	Range Sum of BST	Easy	Python
0942	DI String Match	Easy	Python
0944	Delete Columns to Make Sorted	Easy	Python
0946	Validate Stack Sequences	Medium	Python
0950	Reveal Cards In Increasing Order	Medium	Python
0953	Verifying an Alien Dictionary	Easy	Python
0961	N-Repeated Element in Size 2N Array	Easy	Python
0965	Univalued Binary Tree	Easy	Python / Java
0973	K Closest Points to Origin	Medium	Python
0976	Largest Perimeter Triangle	Easy	Python
0977	Squares of a Sorted Array	Easy	Python
0988	Smallest String Starting From Leaf	Medium	Python
0989	Add to Array-Form of Integer	Easy	Python
0997	Find the Town Judge	Easy	Python
1002	Find Common Characters	Easy	Python
1005	Maximize Sum Of Array After K Negations	Easy	Python
1009	Complement of Base 10 Integer	Easy	Python
1010	Pairs of Songs With Total Durations Divisible by 60	Medium	Python
1013	Partition Array Into Three Parts With Equal Sum	Easy	Python / C++
1016	Binary String With Substrings Representing 1 To N	Medium	Python
1017	Convert to Base -2	Medium	Python	Negative Base
1018	Binary Prefix Divisible By 5	Easy	Python
1021	Remove Outermost Parentheses	Easy	Python
1025	Divisor Game	Easy	Python
1037	Valid Boomerang	Easy	JavaScript / Python
1038	Binary Search Tree to Greater Sum Tree	Medium	C
1046	Last Stone Weight	Easy	Python
1047	Remove All Adjacent Duplicates In String	Easy	Python / Java
1050	Actors and Directors Who Cooperated At Least Three Times	Easy	MySQL
1051	Height Checker	Easy	JavaScript
1068	Product Sales Analysis I	Easy	MySQL
1071	Greatest Common Divisor of Strings	Easy	Python
1078	Occurrences After Bigram	Easy	Python
1079	Letter Tile Possibilities	Medium	Python
1084	Sales Analysis III	Easy	MySQL
1089	Duplicate Zeros	Easy	Python
1095	Find in Mountain Array	Hard	Python
1103	Distribute Candies to People	Easy	Python
1108	Defanging an IP Address	Easy	JavaScript / Java / C++
1122	Relative Sort Array	Easy	Python
1128	Number of Equivalent Domino Pairs	Easy	Python
1137	N-th Tribonacci Number	Easy	Python / PHP / Java / C++
1141	User Activity for the Past 30 Days I	Easy	MySQL
1148	Article Views I	Easy	MySQL
1154	Day of the Year	Easy	Python
1160	Find Words That Can Be Formed by Characters	Easy	Python / Java
1161	Maximum Level Sum of a Binary Tree	Medium	Python
1175	Prime Arrangements	Easy	Python
1179	Reformat Department Table	Easy	MySQL
1189	Maximum Number of Balloons	Easy	Python
1200	Minimum Absolute Difference	Easy	Python / Java
1207	Unique Number of Occurrences	Easy	Python
1208	Get Equal Substrings Within Budget	Medium	Python
1218	Longest Arithmetic Subsequence of Given Difference	Medium	Python / C++
1221	Split a String in Balanced Strings	Easy	JavaScript
1222	Queens That Can Attack the King	Medium	C++
1227	Airplane Seat Assignment Probability	Medium	Python	*Mathematical Solution [1]
1232	Check If It Is a Straight Line	Easy	Python / C++
1233	Remove Sub-Folders from the Filesystem	Medium	Python
1237	Find Positive Integer Solution for a Given Equation	Medium	Python
1238	Circular Permutation in Binary Representation	Medium	Python / Java
1250	Check If It Is a Good Array	Hard	Python
1252	Cells with Odd Values in a Matrix	Easy	Python / Java
1254	Number of Closed Islands	Medium	Python / C++
1261	Find Elements in a Contaminated Binary Tree	Medium	Python / C++
1266	Minimum Time Visiting All Points	Easy	JavaScript
1275	Find Winner on a Tic Tac Toe Game	Easy	Python
1276	Number of Burgers with No Waste of Ingredients	Medium	Python
1281	Subtract the Product and Sum of Digits of an Integer	Easy	JavaScript / Python
1282	Group the People Given the Group Size They Belong To	Medium	Python
1287	Element Appearing More Than 25% In Sorted Array	Easy	Python
1290	Convert Binary Number in a Linked List to Integer.js	Easy	JavaScript
1295	Find Numbers with Even Number of Digits	Easy	JavaScript
1299	Replace Elements with Greatest Element on Right Side	Easy	Python
1302	Deepest Leaves Sum	Medium	Python	Depth-First Search
1304	Find N Unique Integers Sum up to Zero	Easy	JavaScript
1305	All Elements in Two Binary Search Trees	Medium	Python / C++
1309	Decrypt String from Alphabet to Integer Mapping	Easy	JavaScript / Python
1310	XOR Queries of a Subarray	Medium	Python
1313	Decompress Run-Length Encoded List	Easy	JavaScript
1315	Sum of Nodes with Even-Valued Grandparent	Medium	C
1317	Convert Integer to the Sum of Two No-Zero Integers	Easy	Python
1318	Minimum Flips to Make a OR b Equal to c	Medium	Python
1323	Maximum 69 Number	Easy	JavaScript
1324	Print Words Vertically	Medium	Python
1327	List the Products Ordered in a Period	Easy	MySQL
1329	Sort the Matrix Diagonally	Medium	Python
1331	Rank Transform of an Array	Easy	Python
1332	Remove Palindromic Subsequences	Easy	Python
1337	The K Weakest Rows in a Matrix	Easy	Python
1338	Reduce Array Size to The Half	Medium	Python
1341	Movie Rating	Medium	MySQL
1342	Number of Steps to Reduce a Number to Zero	Easy	JavaScript
1344	Angle Between Hands of a Clock	Medium	C
1346	Check If N and Its Double Exist	Easy	Python
1347	Minimum Number of Steps to Make Two Strings Anagram	Medium	Python / Java
1351	Count Negative Numbers in a Sorted Matrix	Easy	Python / C++
1356	Sort Integers by The Number of 1 Bits	Easy	Python
1357	Apply Discount Every n Orders	Medium	Python / Java
1360	Number of Days Between Two Dates	Easy	Python
1365	How Many Numbers Are Smaller Than the Current Number	Easy	JavaScript
1370	Increasing Decreasing String	Easy	Python
1374	Generate a String With Characters That Have Odd Counts	Easy	Python
1378	Replace Employee ID With The Unique Identifier	Easy	MySQL
1379	Find a Corresponding Node of a Binary Tree in a Clone of That Tree	Easy	Python	Depth-First Search, Tree
1380	Lucky Numbers in a Matrix	Easy	Python
1381	Design a Stack With Increment Operation	Medium	Python
1385	Find the Distance Value Between Two Arrays	Easy	Python
1387	Sort Integers by The Power Value	Medium	Python
1389	Create Target Array in the Given Order	Easy	JavaScript
1393	Capital Gain／Loss	Medium	MySQL
1394	Find Lucky Integer in an Array	Easy	Python
1399	Count Largest Group	Easy	Python
1402	Reducing Dishes	Hard	Python
1407	Top Travellers	Easy	MySQL
1408	String Matching in an Array	Easy	Python
1409	Queries on a Permutation With Key	Medium	Python
1410	HTML Entity Parser	Medium	Python
1413	Minimum Value to Get Positive Step by Step Sum	Easy	Python
1415	The k-th Lexicographical String of All Happy Strings of Length n	Medium	C++
1417	Reformat The String	Easy	Python
1418	Display Table of Food Orders in a Restaurant	Medium	Python
1422	Maximum Score After Splitting a String	Easy	Python
1431	Kids With the Greatest Number of Candies	Easy	JavaScript
1432	Max Difference You Can Get From Changing an Integer	Medium	Python
1433	Check If a String Can Break Another String	Medium	Python
1436	Destination City	Easy	Python
1437	Check If All 1's Are at Least Length K Places Away	Easy	Python
1441	Build an Array With Stack Operations	Medium	Python / Java
1446	Consecutive Characters	Easy	Python
1448	Count Good Nodes in Binary Tree	Medium	Python / C++
1450	Number of Students Doing Homework at a Given Time	Easy	Python
1451	Rearrange Words in a Sentence	Medium	Python
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	Easy	Python
1456	Maximum Number of Vowels in a Substring of Given Length	Medium	Python / C++
1460	Make Two Arrays Equal by Reversing Sub-arrays	Easy	JavaScritp / Python
1461	Check If a String Contains All Binary Codes of Size K	Medium	Python
1464	Maximum Product of Two Elements in an Array	Easy	Python
1465	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	Medium	Python
1470	Shuffle the Array	Easy	JavaScript / Python / Java / C++
1472	Design Browser History	Medium	Python
1475	Final Prices With a Special Discount in a Shop	Easy	Python
1476	Subrectangle Queries	Midium	Python / C++
1480	Running Sum of 1d Array	Easy	JavaScript / Python / Java
1484	Group Sold Products By The Date	Easy	MySQL
1486	XOR Operation in an Array	Easy	JavaScript
1491	Average Salary Excluding the Minimum and Maximum Salary	Easy	Python / C
1492	The kth Factor of n	Medium	Python
1496	Path Crossing	Easy	Python
1502	Can Make Arithmetic Progression From Sequence	Easy	Python / C
1507	Reformat Date	Easy	Python
1512	Number of Good Pairs	Easy	JavaScript / Java / C++
1517	Find Users With Valid E-Mails	Easy	MySQL
1518	Water Bottles	Easy	Python
1523	Count Odd Numbers in an Interval Range	Easy	Python
1525	Number of Good Ways to Split a String	Medium	Python / Java
1527	Patients With a Condition	Easy	MySQL
1528	Shuffle String	Easy	JavaScript / Java
1534	Count Good Triplets	Easy	JavaScript
1539	Kth Missing Positive Number	Easy	Python / C++
1544	Make The String Great	Easy	Python
1545	Find Kth Bit in Nth Binary String	Medium	Python
1550	Three Consecutive Odds	Easy	Python
1551	Minimum Operations to Make Array Equal	Medium	Python / Java
1556	Thousand Separator	Easy	Python	*Built-in Function Solution [1]
1557	Minimum Number of Vertices to Reach All Nodes	Medium	C++
1561	Maximum Number of Coins You Can Get	Medium	Python
1572	Matrix Diagonal Sum	Easy	Python / C
1576	Replace All ?'s to Avoid Consecutive Repeating Characters	Easy	Python
1581	Customer Who Visited but Did Not Make Any Transactions	Easy	MySQL
1582	Special Positions in a Binary Matrix	Easy	C
1587	Bank Account Summary II	Easy	MySQL
1588	Sum of All Odd Length Subarrays	Easy	Python	*Mathematical Method [1]
1592	Rearrange Spaces Between Words	Easy	Python
1598	Crawler Log Folder	Easy	Python
1603	Design Parking System	Easy	Python / Python / Java / C++
1605	Find Valid Matrix Given Row and Column Sums	Easy	Python	Greedy Algorithm
1609	Even Odd Tree	Medium	Python
1614	Maximum Nesting Depth of the Parentheses	Easy	JavaScript
1624	Largest Substring Between Two Equal Characters	Easy	Python
1629	Slowest Key	Easy	Python
1630	Arithmetic Subarrays	Medium	Python
1636	Sort Array by Increasing Frequency	Easy	Python
1637	Widest Vertical Area Between Two Points Containing No Points	Medium	Python
1641	Count Sorted Vowel Strings	Medium	Python	*Methamatical Method [1]
1646	Get Maximum in Generated Array	Easy	Python
1647	Minimum Deletions to Make Character Frequencies Unique	Medium	Python
1653	Minimum Deletions to Make String Balanced	Medium	Python / C
1657	Determine if Two Strings Are Close	Medium	Python
1662	Check If Two String Arrays are Equivalent	Easy	JavaScript / Python
1663	Smallest String With A Given Numeric Value	Medium	Python
1652	Defuse the Bomb	Easy	Python
1661	Average Time of Process per Machine	Easy	MySQL
1667	Fix Names in a Table	Easy	MySQL
1668	Maximum Repeating Substring	Easy	Python
1669	Merge In Between Linked Lists	Medium	C++
1672	Richest Customer Wealth	Easy	JavaScript / Python / Java
1678	Goal Parser Interpretation	Easy	JavaScript / Python
1679	Max Number of K-Sum Pairs	Medium	Python
1684	Count the Number of Consistent Strings	Easy	JavaScript
1685	Sum of Absolute Differences in a Sorted Array	Medium	C
1688	Count of Matches in Tournament	Easy	JavaScript
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	Medium	JavaScript / Python / Java / C++
1693	Daily Leads and Partners	Easy	MySQL
1694	Reformat Phone Number	Easy	Python
1700	Number of Students Unable to Eat Lunch	Easy	Python
1701	Average Waiting Time	Medium	Python
1704	Determine if String Halves Are Alike	Easy	Python
1710	Maximum Units on a Truck	Easy	Python
1720	Decode XORed Array	Easy	JavaScript
1721	Swapping Nodes in a Linked List	Medium	Python
1725	Number Of Rectangles That Can Form The Largest Square	Easy	Python
1726	Tuple with Same Product	Medium	Python
1729	Find Followers Count	Easy	MySQL
1732	Find the Highest Altitude	Easy	JavaScript
1736	Latest Time by Replacing Hidden Digits	Easy	Python
1741	Find Total Time Spent by Each Employee	Easy	MySQL
1742	Maximum Number of Balls in a Box	Easy	Python
1748	Sum of Unique Elements	Easy	Python
1752	Check if Array Is Sorted and Rotated	Easy	Python / C
1757	Recyclable and Low Fat Products	Easy	MySQL
1758	Minimum Changes To Make Alternating Binary String	Easy	Python
1768	Merge Strings Alternately	Easy	Python	*Built-in Function Solution [1]
1769	Minimum Number of Operations to Move All Balls to Each Box	Medium	Python
1773	Count Items Matching a Rule	Easy	JavaScript
1779	Find Nearest Point That Has the Same X or Y Coordinate	Easy	Python
1780	Check if Number is a Sum of Powers of Three	Medium	Python
1784	Check if Binary String Has at Most One Segment of Ones	Easy	Python
1785	Minimum Elements to Add to Form a Given Sum	Medium	Python
1790	Check if One String Swap Can Make Strings Equal	Easy	Python / C
1791	Find Center of Star Graph	Easy	Python
1793	Maximum Score of a Good Subarray	Hard	C++ / Python
1795	Rearrange Products Table	Easy	MySQL
1796	Second Largest Digit in a String	Easy	Python
1800	Maximum Ascending Subarray Sum	Easy	C++ / C
1805	Number of Different Integers in a String	Easy	JavaScript
1806	Minimum Number of Operations to Reinitialize a Permutation	Medium	Python
1807	Evaluate the Bracket Pairs of a String	Medium	Python
1812	Determine Color of a Chessboard Square	Easy	Python
1816	Truncate Sentence	Easy	JavaScript
1817	Finding the Users Active Minutes	Medium	Python
1822	Sign of the Product of an Array	Easy	Python / C
1823	Find the Winner of the Circular Game	Medium	C
1827	Minimum Operations to Make the Array Increasing	Easy	JavaScript
1828	Queries on Number of Points Inside a Circle	Medium	Python / Java
1832	Check if the Sentence Is Pangram	Easy	JavaScript
1833	Maximum Ice Cream Bars	Medium	Python / Java
1837	Sum of Digits in Base K	Easy	JavaScript
1839	Longest Substring Of All Vowels in Order	Medium	Python
1844	Replace All Digits with Characters	Easy	JavaScript
1848	Minimum Distance to the Target Element	Easy	Python
1854	Maximum Population Year	Easy	Python
1855	Maximum Distance Between a Pair of Values	Medium	Python
1859	Sorting the Sentence	Easy	JavaScript
1861	Rotating the Box	Medium	Python
1863	Sum of All Subset XOR Totals	Easy	Python
1869	Longer Contiguous Segments of Ones than Zeros	Easy	Python
1873	Calculate Special Bonus	Easy	MySQL
1876	Substrings of Size Three with Distinct Characters	Easy	Python / Java
1877	Minimize Maximum Pair Sum in Array	Medium	Python
1880	Check if Word Equals Summation of Two Words	Easy	Python
1884	Egg Drop With 2 Eggs and N Floors	Medium	Python / Java
1886	Determine Whether Matrix Can Be Obtained By Rotation	Easy	Python
1890	The Latest Login in 2020	Easy	MySQL
1893	Check if All the Integers in a Range Are Covered	Easy	Python
1894	Find the Student that Will Replace the Chalk	Medium	C
1903	Largest Odd Number in String	Easy	Python
1909	Remove One Element to Make the Array Strictly Increasing	Easy	C
1910	Remove All Occurrences of a Substring	Medium	Java / Python
1913	Maximum Product Difference Between Two Pairs	Easy	JavaScript
1920	Build Array from Permutation	Easy	JavaScript / PHP / Java / C++
1925	Concatenation of Array	Easy	JavaScript / Java
1929	Concatenation of Array	Easy	JavaScript / Java / C++
1935	Maximum Number of Words You Can Type	Easy	Python
1941	Check if All Characters Have Equal Number of Occurrences	Easy	JavaScript
1945	Sum of Digits of String After Convert	Easy	Python
1952	Three Divisors	Easy	Python	*Mathematical Method [1]
1961	Check If String Is a Prefix of Array	Easy	Python
1963	Minimum Number of Swaps to Make the String Balanced	Medium	Python / Java
1965	Employees With Missing Information	Easy	MySQL
1967	Number of Strings That Appear as Substrings in Word	Easy	JavaScript
1974	Minimum Time to Type Word Using Special Typewriter	Easy	Python / Java
1979	Find Greatest Common Divisor of Array	Easy	Python
1984	Minimum Difference Between Highest and Lowest of K Scores	Easy	Python
2000	Reverse Prefix of Word	Easy	Python
2006	Count Number of Pairs With Absolute Difference K	Easy	JavaScript
2011	Final Value of Variable After Performing Operations	Easy	JavaScript / Java / C++
2022	Convert 1D Array Into 2D Array	Easy	Python
2023	Number of Pairs of Strings With Concatenation Equal to Target	Medium	Python
2032	Two Out of Three	Easy	Python
2037	Minimum Number of Moves to Seat Everyone	Easy	Python
2042	Check if Numbers Are Ascending in a Sentence	Easy	Python
2047	Number of Valid Words in a Sentence	Easy	Python
2053	2053. Kth Distinct String in an Array	Easy	Python
2057	Smallest Index With Equal Value	Easy	Python
2078	Two Furthest Houses With Different Colors	Easy	Python / Java
2079	Watering Plants	Medium	Python
2085	Count Common Words With One Occurrence	Easy	Python
2087	Minimum Cost Homecoming of a Robot in a Grid	Medium	Python
2089	Find Target Indices After Sorting Array	Easy	JavaScript
2091	Removing Minimum and Maximum From Array	Medium	Python
2094	Finding 3-Digit Even Numbers	Easy	Python
2099	Find Subsequence of Length K With the Largest Sum	Easy	Python
2102	Sequentially Ordinal Rank Tracker	Hard	Python
2103	Rings and Rods	Easy	JavaScript
2108	Find First Palindromic String in the Array	Easy	JavaScript
2109	Adding Spaces to a String	Medium	Python
2114	Maximum Number of Words Found in Sentences	Easy	JavaScript / Java
2119	A Number After a Double Reversal	Easy	JavaScript
2120	Execution of All Suffix Instructions Staying in a Grid	Medium	C++
2124	Check if All A's Appears Before All B's	Easy	Python
2125	Number of Laser Beams in a Bank	Medium	Python
2126	Destroying Asteroids	Medium	Python /Java
2129	Capitalize the Title	Easy	Python
2133	Check if Every Row and Column Contains All Numbers	Easy	Python
2138	Divide a String Into Groups of Size k	Easy	Python
2144	Minimum Cost of Buying Candies With Discount	Easy	Python / C++
2149	Rearrange Array Elements by Sign	Medium	Python
2154	Keep Multiplying Found Values by Two	Easy	Python
2160	Minimum Sum of Four Digit Number After Splitting Digits	Easy	JavaScript
2161	Partition Array According to Given Pivot	Medium	Python / C++
2164	Partition Array According to Given Pivot	Easy	Python
2165	Smallest Value of the Rearranged Number	Medium	Python
2169	Sort Even and Odd Indices Independently	Easy	Python
2176	Count Equal and Divisible Pairs in an Array	Easy	JavaScript
2177	Find Three Consecutive Integers That Sum to a Given Number	Medium	Python / Rust
2180	Count Integers With Even Digit Sum	Easy	Python
2181	Merge Nodes in Between Zeros	Medium	Python
2185	Counting Words With a Given Prefix	Easy	JavaScript / Python
2190	Most Frequent Number Following Key In an Array	Easy	Python
2191	Sort the Jumbled Numbers	Medium	Python
2194	Cells in a Range on an Excel Sheet	Easy	JavaScript
2195	Append K Integers With Minimal Sum	Medium	Python
2200	Find All K-Distant Indices in an Array	Easy	Python
2206	Divide Array Into Equal Pairs	Easy	Python
2210	Count Hills and Valleys in an Array	Easy	Python
2215	Find the Difference of Two Arrays	Easy	Python
2216	Minimum Deletions to Make Array Beautiful	Medium	Python
2220	Minimum Bit Flips to Convert Number	Easy	JavaScript
2221	Find Triangular Sum of an Array	Medium	Python / Java
2224	Minimum Number of Operations to Convert Time	Easy	Python
2225	Find Players With Zero or One Losses	Medium	Python
2231	Largest Number After Digit Swaps by Parity	Easy	Python
2235	Add Two Integers	Easy	JavaScript / PHP / Java / Python / C++
2236	Root Equals Sum of Children	Easy	JavaScript
2239	Find Closest Number to Zero	Easy	Python
2240	Number of Ways to Buy Pens and Pencils	Medium	Python
2241	Design an ATM Machine	Medium	Python
2243	Calculate Digit Sum of a String	Easy	Python
2244	Minimum Rounds to Complete All Tasks	Medium	Python
2248	Intersection of Multiple Arrays	Easy	Python
2255	Count Prefixes of a Given String	Easy	Python / PHP
2259	Remove Digit From Number to Maximize Result	Easy	Python
2264	Largest 3-Same-Digit Number in String	Easy	JavaScript / Python
2265	Count Nodes Equal to Average of Subtree	Medium	C
2269	Find the K-Beauty of a Number	Easy	Python / C++
2270	Number of Ways to Split Array	Medium	Python
2273	Find Resultant Array After Removing Anagrams	Easy	Python
2274	Maximum Consecutive Floors Without Special Floors	Medium	Python
2278	Percentage of Letter in String	Easy	Python
2283	Check if Number Has Equal Digit Count and Digit Value	Easy	Python
2284	Sender With Largest Word Count	Medium	Python
2287	Rearrange Characters to Make Target String	Easy	Python
2288	Apply Discount to Prices	Medium	Python
2293	Min Max Game	Easy	Python
2294	Partition Array Such That Maximum Difference Is K	Medium	Python
2295	Replace Elements in an Array	Medium	Python
2299	Strong Password Checker II	Easy	Python
2300	Successful Pairs of Spells and Potions	Medium	C++
2303	Calculate Amount Paid in Taxes	Easy	Python
2309	Greatest English Letter in Upper and Lower Case	Easy	Python / Java
2315	Count Asterisks	Easy	Python
2319	Check if Matrix Is X-Matrix	Easy	Python
2325	Decode the Message	Easy	Python
2331	Evaluate Boolean Binary Tree	Easy	Python / Java
2336	Smallest Number in Infinite Set	Medium	Python
2341	Maximum Number of Pairs in Array	Easy	Python
2342	Max Sum of a Pair With Equal Sum of Digits	Medium	Python
2343	Query Kth Smallest Trimmed Number	Medium	Python
2348	Number of Zero-Filled Subarrays	Medium	Python
2351	First Letter to Appear Twice	Easy	Python
2352	Equal Row and Column Pairs	Medium	Python
2357	Make Array Zero by Subtracting Equal Amounts	Easy	Python
2363	Merge Similar Items	Easy	Python
2367	Number of Arithmetic Triplets	Easy	Python
2373	Largest Local Values in a Matrix	Easy	Python
2374	Node With Highest Edge Score	Medium	Python
2379	Minimum Recolors to Get K Consecutive Black Blocks	Easy	Python
2384	Largest Palindromic Number	Medium	Python
2389	Longest Subsequence With Limited Sum	Easy	C / Python
2390	Removing Stars From a String	Medium	Python / Java
2391	Minimum Amount of Time to Collect Garbage	Medium	Python / Java
2396	Strictly Palindromic Number	Medium	Python / C++
2399	Check Distances Between Same Letters	Easy	Python / Java
2404	Most Frequent Even Element	Easy	Python
2405	Optimal Partition of String	Medium	Python / Java / C++
2410	Maximum Matching of Players With Trainers	Medium	Python / C
2413	Smallest Even Multiple	Easy	Python / Java
2418	Sort the People	Easy	Python
2425	Bitwise XOR of All Pairings	Medium	C
2427	Number of Common Factors	Easy	Java
2428	Maximum Sum of an Hourglass	Medium	C++
2429	Minimize XOR	Medium	C
2433	Find The Original Array of Prefix Xor	Medium	Python
2442	Count Number of Distinct Integers After Reverse Operations	Medium	Python / C++
2451	Odd String Difference	Easy	Python
2455	Average Value of Even Numbers That Are Divisible by Three	Easy	Python
2456	Most Popular Video Creator	Medium	Python
2469	Convert the Temperature	Easy	Python / Java
2475	Number of Unequal Triplets in Array	Easy	Python / Java
2482	Difference Between Ones and Zeros in Row and Column	Medium	Python
2483	Minimum Penalty for a Shop	Medium	Python
2485	Find the Pivot Integer	Easy	Java
2491	Divide Players Into Teams of Equal Skill	Medium	Python
2500	Delete Greatest Value in Each Row	Easy	Python
2506	Count Pairs Of Similar Strings	Easy	Python
2511	Maximum Enemy Forts That Can Be Captured	Easy	Python
2515	Maximum Enemy Forts That Can Be Captured	Easy	Python
2520	Maximum Enemy Forts That Can Be Captured	Easy	Python
2521	Distinct Prime Factors of Product of Array	Medium	C
2522	Partition String Into Substrings With Values at Most K	Medium	Python
2525	Count the Digits That Divide a Number	Easy	Python
2527	Find Xor-Beauty of Array	Easy	Python
2529	Maximum Count of Positive Integer and Negative Integer	Easy	Python
2535	Difference Between Element Sum and Digit Sum of an Array	Easy	Java / Python
2540	Minimum Common Value	Easy	Python
2544	Alternating Digit Sum	Easy	Python
2545	Sort the Students by Their Kth Score	Medium	C++ / Python
2574	Left and Right Sum Differences	Easy	C++
2579	Count Total Number of Colored Cells	Medium	C
2582	Pass the Pillow	Easy	Python
2586	Count the Number of Vowel Strings in Range	Easy	C++
2591	Distribute Money to Maximum Children	Easy	Python / C++
2592	Maximize Greatness of an Array	Medium	C++
2595	Number of Even and Odd Bits	Easy	C++
2600	K Items With the Maximum Sum	Easy	C++
2605	Form Smallest Number From Two Digit Arrays	Easy	Python
2609	Find the Longest Balanced Substring of a Binary String	Easy	Python / C
2610	Convert an Array Into a 2D Array With Conditions	Medium	Python
2611	Mice and Cheese	Medium	Python
2618	Check if Object Instance of Class	Medium	JavaScript
2619	Array Prototype Last	Easy	JavaScript
2620	Counter	Easy	JavaScript / TypeScript
2621	Sleep	Easy	JavaScript / TypeScript
2626	Array Reduce Transformation	Easy	JavaScript / TypeScript
2629	Function Composition	Easy	JavaScript
2631	Group By	Medium	JavaScript
2633	Convert Object to JSON String	Medium	JavaScript
2634	Filter Elements from Array	Easy	JavaScript
2635	Apply Transform Over Each Element in Array	Easy	JavaScript
2637	Promise Time Limit	Easy	JavaScript
2644	Find the Maximum Divisibility Score	Easy	Python
2645	Minimum Additions to Make Valid String	Medium	Python / C
2648	Generate Fibonacci Sequence	Easy	JavaScript
2651	Calculate Delayed Arrival Time	Easy	C
2652	Sum Multiples	Easy	C
2656	Maximum Sum With Exactly K Elements	Easy	C
2657	Find the Prefix Common Array of Two Arrays	Medium	Python
2660	Determine the Winner of a Bowling Game	Easy	Python
2665	Counter II	Easy	JavaScript
2666	Allow One Function Call	Easy	JavaScript
2667	Create Hello World Function	Easy	JavaScript
2677	Chunk Array	Easy	JavaScript
2695	Array Wrapper	Easy	JavaScript
2703	Return Length of Arguments Passed	Easy	JavaScript
2704	To Be Or Not To Be	Easy	JavaScript
2706	Buy Two Chocolates	Easy	Python
2710	Remove Trailing Zeros From a String	Easy	Python
2716	Minimize String Length	Easy	C
2723	Add Two Promises	Easy	JavaScript
2724	Sort By	Easy	JavaScript
2726	Calculator with Method Chaining	Easy	JavaScript
2727	Is Object Empty	Easy	JavaScript
2733	Neither Minimum nor Maximum	Easy	C
2739	Total Distance Traveled	Easy	C
2739	Total Distance Traveled	Easy	C
2763	Sum of Imbalance Numbers of All Subarrays	Hard	Python / C++
2769	Find the Maximum Achievable Number	Easy	C
2778	Sum of Squares of Special Elements	Easy	C
2785	Sort Vowels in a String	Medium	C
2788	Split Strings by Separator	Easy	Python
2798	Number of Employees Who Met the Target	Easy	C
2806	Account Balance After Rounded Purchase	Easy	C++
2807	Insert Greatest Common Divisors in Linked List	Medium	C
2810	Faulty Keyboard	Easy	Python
2824	Count Pairs Whose Sum is Less than Target	Easy	Python
2833	Furthest Point From Origin	Easy	Python
2859	Sum of Values at Indices With K Set Bits	Easy	C
2870	Minimum Number of Operations to Make Array Empty	Medium	Python
2879	Display the First Three Rows	Easy	Python
2882	Drop Duplicate Rows	Easy	Python
2884	Modify Columns	Easy	Python
2886	Change Data Type	Easy	Python
2888	Reshape Data: Concatenate	Easy	Python
2890	Reshape Data: Melt	Easy	Python
2894	Divisible and Non-divisible Sums Difference	Easy	C
2951	Find the Peaks	Easy	C
2974	Minimum Number Game	Easy	C
2997	Minimum Number of Operations to Make Array XOR Equal to K	Medium	C
3065	Minimum Operations to Exceed Threshold Value I	Easy	C
3084	Count Substrings Starting and Ending with Given Character	Medium	C
3105	Longest Strictly Increasing or Strictly Decreasing Subarray	Easy	Python / C
3110	Score of a String	Easy	C
3146	Permutation Difference between Two Strings	Easy	C
3151	Special Array I	Easy	C
3160	Find the Number of Distinct Colors Among the Balls	Medium	Python
3162	Find the Number of Good Pairs I	Easy	C
3174	Clear Digits	Easy	Python / C
3190	Find Minimum Operations to Make All Elements Divisible by Three	Easy	C
3211	Generate Binary Strings Without Adjacent Zeros	Medium	Python
3233	Find the Count of Numbers Which Are Not Special	Medium	C
3436	Find Valid Emails	Easy	MySQL