LeetCode Solutions

Welcome to a robust and versatile repository of LeetCode solutions! This repository is a treasure trove for coding enthusiasts, educators, students, and professionals who are preparing for technical interviews or enhancing their coding skills.

What You'll Find Here

Wide Range of Problems: Our collection includes an extensive range of LeetCode problems, covering various topics and difficulty levels – from Easy to Hard.
Multi-Language Support: We offer solutions in several programming languages, including Python, C++, JavaScript, SQL, and TypeScript, catering to a diverse coding community.
Organized and Accessible: Each solution is meticulously organized by difficulty and language, making it easy to navigate and find what you need.
In-Depth Explanations: You'll find README files in each problem folder with detailed explanations of the problem, the approach taken, and a thorough walkthrough of the solution.

Statistics

Folder Structure

The solutions are organized as follows:

Difficulty: Problems are categorized into Easy, Medium, and Hard.
Languages: Solutions are available in multiple programming languages, including Python, C++, JavaScript, SQL, and TypeScript.
Problem Titles: Each problem is named after its LeetCode title.

Question List

#	Title	Solution	Difficulty & ReadMe
0001	Two Sum	Python, C++	Easy
0002	Add Two Numbers	C++	Medium
0003	Longest Substring Without Repeating Characters	Python, C++	Medium
0004	Median of Two Sorted Arrays	Python	Hard
0005	Longest Palindromic Substring	Python	Medium
0006	ZigZag Conversion	Python	Medium
0007	Reverse Integer	Python	Medium
0008	String to Integer (atoi)	Python	Medium
0009	Palindrome Number	C++	Easy
0010	Regular Expression Matching	Python	Hard
0011	Container With Most Water	Python	Medium
0012	Integer to Roman	Python	Medium
0013	Roman to Integer	C++	Easy
0014	Longest Common Prefix	C++	Easy
0015	3Sum	Python, C++	Medium
0016	3Sum Closest	Python	Medium
0017	Letter Combinations of a Phone Number	Python	Medium
0018	4Sum	Python	Medium
0019	Remove Nth Node From End of List	Python, C++	Medium
0020	Valid Parentheses	Python, C++, JavaScript	Easy
0021	Merge Two Sorted Lists	Python, C++, Javascript	Easy
0022	Generate Parentheses	Python	Medium
0023	Merge k Sorted Lists	Python	Hard
0024	Swap Nodes in Pairs	Python	Medium
0025	Reverse Nodes in k-Group	Python	Hard
0026	Remove Duplicates from Sorted Array	Python	Easy
0027	Remove Element	Python	Easy
0028	Implement strStr()	Python	Easy
0029	Divide Two Integers	Python	Medium
0031	Next Permutation	Python	Medium
0033	Search in Rotated Sorted Array	Python	Medium
0034	Find First and Last Position of Element in Sorted Array	Python	Medium
0035	Search Insert Position	C++	Easy
0036	Valid Sudoku	Python, C++	Medium
0039	Combination Sum	Python	Medium
0041	First Missing Positive	Python	Hard
0042	Trapping Rain Water	Python	Hard
0045	Jump Game II	C++	Hard
0046	Permutations	C++	Medium
0048	Rotate Image	C++	Medium
0049	Group Anagrams	Python, JavaScript	Medium
0050	Pow(x, n)	Python	Medium
0053	Maximum Subarray	Python, C++	Easy
0054	Spiral Matrix	Python, C++	Medium
0055	Jump Game	C++	Medium
0056	Merge Intervals	Python, C++	Medium
0057	Insert Interval	Python	Hard
0058	Length of Last Word	Python	Easy
0059	Spiral Matrix II	C++	Medium
0061	Rotate List	Python	Medium
0062	Unique Paths	Python	Medium
0063	Unique Paths II	Python	Medium
0064	Minimum Path Sum	Python	Medium
0066	Plus One	Python	Easy
0067	Add Binary	Python	Easy
0068	Text Justification	Python	Hard
0069	Sqrt(x)	Python	Easy
0070	Climbing Stairs	Python, C++	Easy
0073	Set Matrix Zeroes	Python	Medium
0074	Search a 2D Matrix	Python, C++	Medium
0075	Sort Colors	Python, JavaScript, C++	Medium
0076	Minimum Window Substring	Python	Hard
0077	Combinations	Python, C++	Medium
0078	Subsets	Python, JavaScript	Medium
0079	Word Search	Python	Medium
0081	Search in Rotated Sorted Array II	Python	Medium
0083	Remove Duplicates from Sorted List	C++	Easy
0084	Largest Rectangle in Histogram	Python	Hard
0085	Maximal Rectangle	Python	Hard
0086	Partition List	Python	Medium
0088	Merge Sorted Array	C++	Easy
0090	Subsets II	Python	Medium
0091	Decode Ways	Python	Medium
0092	Reverse Linked List II	Python	Medium
0094	Binary Tree Inorder Traversal	Python, C++, JavaScript	Easy
0095	Unique Binary Search Trees II	Python	Medium
0097	Interleaving String	Python	Medium
0098	Validate Binary Search Tree	Python, C++	Medium
0100	Same Tree	Python, JavaScript	Easy
0101	Symmetric Tree	C++	Easy
0102	Binary Tree Level Order Traversal	Python, C++	Medium
0104	Maximum Depth of Binary Tree	Python, C++	Easy
0105	Construct Binary Tree from Preorder and Inorder Traversal	Python	Medium
0110	Balanced Binary Tree	Python	Easy
0112	Path Sum	C++	Easy
0116	Populating Next Right Pointers in Each Node	C++	Medium
0118	Pascal's Triangle	Python, C++	Easy
0119	Pascal's Triangle II	Python, C++	Easy
0120	Triangle	Python	Medium
0121	Best Time to Buy and Sell Stock	Python, C++	Easy
0125	Valid Palindrome	Python	Easy
0127	Word Ladder	Python	Medium
0128	Longest Consecutive Sequence	Python	Hard
0129	Sum Root to Leaf Numbers	Python	Medium
0131	Palindrome Partitioning	Python	Medium
0133	Clone Graph	Python	Medium
0135	Candy	Python	Hard
0136	Single Number	Python, C++	Easy
0137	Single Number II	Python	Medium
0138	Copy List with Random Pointer	Python	Medium
0139	Word Break	Python	Medium
0140	Word Break II	Python	Hard
0141	Linked List Cycle	Python, C++, JavaScript	Easy
0143	Reorder List	Python	Medium
0144	Binary Tree Preorder Traversal	Python, C++, JavaScript	Easy
0145	Binary Tree Postorder Traversal	Python, C++, JavaScript	Easy
0146	LRU Cache	Python	Medium
0148	Sort List	Python	Medium
0150	Evaluate Reverse Polish Notation	Python	Medium
0153	Find Minimum in Rotated Sorted Array	Python	Medium
0155	Min Stack	Python	Easy
0159	Longest Substring with At Most Two Distinct Characters	Python	Medium
0162	Find Peak Element	Python	Medium
0165	Compare Version Numbers	Python	Medium
0167	Two Sum II - Input array is sorted	Python, C++	Easy
0168	Excel Sheet Column Title	Python	Easy
0169	Majority Element	Python, C++	Easy
0189	Rotate Array	C++	Medium
0190	Reverse Bits	Python	Easy
0191	Number of 1 Bits	Python	Easy
0198	House Robber	Python, C++	Easy
0199	Binary Tree Right Side View	Python	Medium
0200	Number of Islands	Python	Medium
0201	Bitwise AND of Numbers Range	Python	Medium
0202	Happy Number	Python	Easy
0203	Remove Linked List Elements	C++	Easy
0205	Isomorphic Strings	Python	Easy
0206	Reverse Linked List	Python, C++, JavaScript	Easy
0207	Course Schedule	Python	Medium
0208	Implement Trie (Prefix Tree)	Python	Medium
0213	House Robber II	C++	Medium
0215	Kth Largest Element in an Array	Python	Medium
0217	Contains Duplicate	Python, C++, JavaScript	Easy
0224	Basic Calculator	Python	Hard
0225	Implement Stack using Queues	Python	Easy
0226	Invert Binary Tree	Python, JavaScript	Easy
0229	Majority Element II	Python	Medium
0230	Kth Smallest Element in a BST	Python	Medium
0231	Power of Two	C++	Easy
0232	Implement Queue using Stacks	Python, C++	Easy
0234	Palindrome Linked List	Python	Easy
0235	Lowest Common Ancestor of a Binary Search Tree	Python, C++	Easy
0236	Lowest Common Ancestor of a Binary Tree	Python	Medium
0237	Delete Node in a Linked List	Python	Medium
0238	Product of Array Except Self	Python	Medium
0239	Sliding Window Maximum	Python	Hard
0242	Valid Anagram	Python, C++, JavaScript	Easy
0253	Meeting Rooms II	Python	Medium
0255	Verify Preorder Sequence in Binary Search Tree	Python	Medium
0256	Paint House	Python	Medium
0260	Single Number III	Python	Medium
0268	Missing Number	Python	Easy
0271	Encode and Decode Strings	Python	Medium
0273	Integer to English Words	Python	Hard
0276	Paint Fence	Python	Medium
0278	First Bad Version	Python, C++	Easy
0279	Perfect Squares	Python	Medium
0283	Move Zeroes	C++	Easy
0287	Find the Duplicate Number	Python	Medium
0291	Word Pattern II	Python	Medium
0293	Flip Game	Python	Easy
0295	Find Median from Data Stream	Python	Hard
0296	Best Meeting Point	Python	Hard
0297	Serialize and Deserialize Binary Tree	Python	Hard
0300	Longest Increasing Subsequence	Python	Medium
0305	Number of Islands II	Python	Hard
0310	Minimum Height Trees	Python	Medium
0316	Remove Duplicate Letters	Python	Hard
0322	Coin Change	Python	Medium
0330	Patching Array	Python	Hard
0332	Reconstruct Itinerary	Python	Medium
0338	Counting Bits	Python	Medium
0340	Longest Substring with At Most K Distinct Characters	Python	Medium
0341	Flatten Nested List Iterator	Python	Medium
0342	Power of Four	Python	Easy
0343	Integer Break	Python	Medium
0344	Reverse String	Python, C++	Easy
0346	Moving Average from Data Stream	Python	Easy
0347	Top K Frequent Elements	Python	Medium
0349	Intersection of Two Arrays	Python	Easy
0350	Intersection of Two Arrays II	Python, C++	Easy
0351	Android Unlock Patterns	Python	Medium
0358	Rearrange String k Distance Apart	Python	Hard
0368	Largest Divisible Subset	Python	Medium
0377	Combination Sum IV	Python	Medium
0380	Insert Delete GetRandom O(1)	Python	Medium
0383	Ransom Note	Python, C++	Easy
0387	First Unique Character in a String	Python, C++	Easy
0389	Find the Difference	Python	Easy
0392	Is Subsequence	Python	Easy
0402	Remove K Digits	Python	Medium
0403	Frog Jump	Python	Hard
0404	Sum of Left Leaves	Python	Easy
0409	Longest Palindrome	Python	Easy
0416	Partition Equal Subset Sum	Python	Medium
0438	Find All Anagrams in a String	Python	Medium
0439	Ternary Expression Parser	Python	Medium
0442	Find All Duplicates in an Array	Python	Medium
0446	Arithmetic Slices II - Subsequence	Python	Hard
0451	Sort Characters By Frequency	Python	Medium
0452	Minimum Number of Arrows to Burst Balloons	Python	Medium
0455	Assign Cookies	Python	Easy
0456	132 Pattern	Python	Medium
0458	Poor Pigs	Python	Hard
0459	Repeated Substring Pattern	Python	Easy
0463	Island Perimeter	Python	Easy
0486	Predict the Winner	Python	Medium
0487	Max Consecutive Ones II	Python	Medium
0490	The Maze	Python	Medium
0501	Find Mode in Binary Search Tree	Python	Easy
0502	IPO	Python	Hard
0505	The Maze II	Python	Medium
0506	Relative Ranks	Python	Easy
0509	Fibonacci Number	C++	Easy
0513	Find Bottom Left Tree Value	Python	Medium
0514	Freedom Trail	Python	Hard
0515	Find Largest Value in Each Tree Row	Python	Medium
0518	Coin Change 2	Python	Medium
0523	Continuous Subarray Sum	Python	Medium
0525	Contiguous Array	Python	Medium
0532	K-diff Pairs in an Array	Python	Easy
0540	Single Element in a Sorted Array	Python	Medium
0542	01 Matrix	Python, C++	Medium
0543	Diameter of Binary Tree	Python	Easy
0552	Student Attendance Record II	Python	Hard
0557	Reverse Words in a String III	C++	Easy
0561	Array Partition I	Python	Easy
0566	Reshape the Matrix	C++	Easy
0567	Permutation in String	C++	Medium
0572	Subtree of Another Tree	Python, Javascript	Easy
0573	Squirrel Simulation	Python	Medium
0576	Out of Boundary Paths	Python	Medium
0584	Find Customer Referee	SQL	Easy
0595	Big Countries	SQL	Easy
0606	Construct String from Binary Tree	Python	Easy
0617	Merge Two Binary Trees	C++	Easy
0621	Task Scheduler	Python	Medium
0623	Add One Row to Tree	Python	Medium
0624	Maximum Distance in Arrays	Python	Easy
0629	K Inverse Pairs Array	Python	Hard
0633	Sum of Square Numbers	Python	Medium
0645	Set Mismatch	Python	Easy
0646	Maximum Length of Pair Chain	Python	Medium
0647	Palindromic Substrings	Python	Medium
0648	Replace Words	Python	Medium
0653	Two Sum IV - Input is a BST	C++	Easy
0658	Find K Closest Elements	Python	Medium
0661	Image Smoother	Python	Easy
0664	Strange Printer	Python	Hard
0678	Valid Parenthesis String	Python	Medium
0695	Max Area of Island	C++	Medium
0700	Search in a Binary Search Tree	C++	Easy
0701	Insert into a Binary Search Tree	C++	Medium
0703	Kth Largest Element in a Stream	Python	Easy
0704	Binary Search	Pythoon, C++, Javascript	Easy
0706	Design HashMap	Python, C++	Easy
0712	Minimum ASCII Delete Sum for Two Strings	Python	Medium
0713	Subarray Product Less Than K	Python	Medium
0721	Accounts Merge	Python	Medium
0723	Candy Crush	Python	Medium
0725	Split Linked List in Parts	Python	Medium
0726	Number of Atoms	Python	Hard
0733	Flood Fill	Python, C++	Easy
0739	Daily Temperatures	Python	Medium
0741	Cherry Pickup	Python	Hard
0746	Min Cost Climbing Stairs	Python, C++	Easy
0752	Open the Lock	Python	Medium
0767	Reorganize String	Python	Medium
0776	Split BST	Python	Medium
0779	K-th Symbol in Grammar	Python	Medium
0784	Letter Case Permutation	C++	Medium
0786	K-th Smallest Prime Fraction	Python	Medium
0787	Cheapest Flights Within K Stops	Python	Medium
0791	Custom Sort String	Python	Medium
0799	Champagne Tower	Python	Medium
0808	Soup Servings	Python	Medium
0815	Bus Routes	Python	Hard
0823	Binary Trees With Factors	Python	Medium
0826	Most Profit Assigning Work	Python	Medium
0834	Sum of Distances in Tree	Python	Hard
0840	Magic Squares In Grid	Python	Medium
0844	Backspace String Compare	Python	Easy
0846	Hand of Straights	Python	Medium
0847	Shortest Path Visiting All Nodes	Python	Hard
0852	Peak Index in a Mountain Array	Python	Easy
0857	Minimum Cost to Hire K Workers	Python	Hard
0861	Score After Flipping Matrix	Python	Medium
0867	Transpose Matrix	Python	Easy
0872	Leaf-Similar Trees	Python	Easy
0875	Koko Eating Bananas	Python	Medium
0876	Middle of the Linked List	Python, C++	Easy
0880	Decoded String at Index	Python	Medium
0881	Boats to Save People	Python	Medium
0885	Spiral Matrix III	Python	Medium
0888	Fair Candy Swap	Python	Easy
0894	All Possible Full Binary Trees	Python	Medium
0896	Monotonic Array	Python	Easy
0905	Sort Array By Parity	Python	Easy
0907	Sum of Subarray Minimums	Python	Medium
0912	Sort an Array	Python	Medium
0920	Number of Music Playlists	Python	Hard
0930	Binary Subarrays With Sum	Python	Medium
0931	Minimum Falling Path Sum	Python	Medium
0935	Knight Dialer	Python	Medium
0938	Range Sum of BST	Python	Easy
0945	Minimum Increment to Make Array Unique	Python	Medium
0948	Bag of Tokens	Python	Medium
0950	Reveal Cards In Increasing Order	Python	Medium
0959	Regions Cut By Slashes	Python	Medium
0973	K Closest Points to Origin	Python	Medium
0974	Subarray Sums Divisible by K	Python	Medium
0977	Squares of a Sorted Array	Python, C++	Easy
0979	Distribute Coins in Binary Tree	Python	Medium
0981	Time Based Key-Value Store	Python	Medium
0988	Smallest String Starting From Leaf	Python	Medium
0992	Subarrays with K Different Integers	Python	Hard
0994	Rotting Oranges	Python, C++	Medium
0995	Minimum Number of K Consecutive Bit Flips	Python	Hard
0997	Find the Town Judge	Python	Easy
1002	Find Common Characters	Python	Easy
1026	Maximum Difference Between Node and Ancestor	Python	Medium
1038	Binary Search Tree to Greater Sum Tree	Python	Medium
1043	Partition Array for Maximum Sum	Python	Medium
1046	Last Stone Weight	Python	Easy
1048	Longest String Chain	Python	Medium
1051	Height Checker	Python	Easy
1052	Grumpy Bookstore Owner	Python	Medium
1057	Campus Bikes	Python	Medium
1060	Missing Element in Sorted Array	Python	Medium
1062	Longest Repeating Substring	Python	Medium
1063	Number of Valid Subarrays	Python	Hard
1066	Campus Bikes II	Python	Medium
1071	Greatest Common Divisor of Strings	Python	Easy
1074	Number of Submatrices That Sum to Target	Python	Hard
1095	Find in Mountain Array	Python	Hard
1099	Two Sum Less Than K	Python	Easy
1101	The Earliest Moment When Everyone Become Friends	Python	Medium
1105	Filling Bookcase Shelves	Python	Medium
1110	Delete Nodes And Return Forest	Python	Medium
1119	Remove Vowels from a String	Python	Easy
1120	Maximum Average Subtree	Python	Medium
1122	Relative Sort Array	Python	Easy
1136	Parallel Courses	Python	Hard
1137	N-th Tribonacci Number	Python, C++	Easy
1143	Longest Common Subsequence	Python	Medium
1148	Article Views I	SQL	Easy
1155	Number of Dice Rolls With Target Sum	Python	Medium
1160	Find Words That Can Be Formed by Characters	Python	Easy
1165	Single Row Keyboard	Python	Easy
1167	Minimum Cost to Connect Sticks	Python	Medium
1171	Remove Zero Sum Consecutive Nodes from Linked List	Python	Medium
1183	Maximum Number of Ones	Python	Hard
1190	Reverse Substrings Between Each Pair of Parentheses	Python	Medium
1197	Minimum Knight Moves	Python	Medium
1199	Minimum Time to Build Blocks	Python	Hard
1203	Sort Items by Groups Respecting Dependencies	Python	Hard
1207	Unique Number of Occurrences	Python	Easy
1208	Get Equal Substrings Within Budget	Python	Medium
1216	Valid Palindrome III	Python	Hard
1219	Path with Maximum Gold	Python	Medium
1220	Count Vowels Permutation	Python	Hard
1230	Toss Strange Coins	Python	Medium
1235	Maximum Profit in Job Scheduling	Python	Hard
1239	Maximum Length of a Concatenated String with Unique Characters	Python	Medium
1245	Tree Diameter	Python	Medium
1248	Count Number of Nice Subarrays	Python	Medium
1249	Minimum Remove to Make Valid Parentheses	Python	Medium
1255	Maximum Score Words Formed by Letters	Python	Hard
1265	Print Immutable Linked List in Reverse	C++	Medium
1266	Minimum Time Visiting All Points	Python	Easy
1269	Number of Ways to Stay in the Same Place After Some Steps	Python	Hard
1272	Remove Interval	Python	Medium
1282	Group the People Given the Group Size They Belong To	Python	Medium
1287	Element Appearing More Than 25% In Sorted Array	Python	Easy
1289	Minimum Falling Path Sum II	Python	Hard
1291	Sequential Digits	Python	Medium
1325	Delete Leaves With a Given Value	Python	Medium
1326	Minimum Number of Taps to Open to Water a Garden	Python	Hard
1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Python	Medium
1335	Minimum Difficulty of a Job Schedule	Python	Hard
1337	The K Weakest Rows in a Matrix	Python	Easy
1347	Minimum Number of Steps to Make Two Strings Anagram	Python	Medium
1356	Sort Integers by The Number of 1 Bits	Python	Easy
1359	Count All Valid Pickup and Delivery Options	Python	Hard
1361	Validate Binary Tree Nodes	Python	Medium
1380	Lucky Numbers in a Matrix	Python	Easy
1382	Balance a Binary Search Tree	Python	Medium
1395	Count Number of Teams	Python	Medium
1404	Number of Steps to Reduce a Number in Binary Representation to One	Python	Medium
1420	Build Array Where You Can Find The Maximum Exactly K Comparisons	Python	Hard
1422	Maximum Score After Splitting a String	Python	Easy
1424	Diagonal Traverse II	Python	Medium
1425	Constrained Subsequence Sum	Python	Hard
1428	Leftmost Column with at Least a One	Python	Medium
1436	Destination City	Python	Easy
1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Python	Medium
1441	Build an Array With Stack Operations	Python	Easy
1442	Count Triplets That Can Form Two Arrays of Equal XOR	Python	Medium
1457	Pseudo-Palindromic Paths in a Binary Tree	Python	Medium
1458	Max Dot Product of Two Subsequences	Python	Hard
1460	Make Two Arrays Equal by Reversing Subarrays	Python	Easy
1463	Cherry Pickup II	Python	Hard
1464	Maximum Product of Two Elements in an Array	Python	Easy
1469	Find All The Lonely Nodes	Python	Easy
1470	Shuffle the Array	Python	Easy
1481	Least Number of Unique Integers after K Removals	Python	Medium
1482	Minimum Number of Days to Make m Bouquets	Python	Medium
1489	Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree	Python	Hard
1496	Path Crossing	Python	Easy
1508	Range Sum of Sorted Subarray Sums	Python	Medium
1509	Minimum Difference Between Largest and Smallest Value in Three Moves	Python	Medium
1512	Number of Good Pairs	Python	Easy
1518	Water Bottles	Python	Easy
1530	Number of Good Leaf Nodes Pairs	Python	Medium
1531	String Compression II	Python	Hard
1535	Find the Winner of an Array Game	Python	Medium
1544	Make The String Great	Python	Easy
1550	Three Consecutive Odds	Python	Medium
1552	Magnetic Force Between Two Balls	Python	Medium
1561	Maximum Number of Coins You Can Get	Python	Medium
1568	Minimum Number of Days to Disconnect Island	Python	Hard
1578	Minimum Deletion Cost to Avoid Repeating Letters	Python	Medium
1579	Remove Max Number of Edges to Keep Graph Fully Traversable	Python	Hard
1580	Put Boxes Into the Warehouse II	Python	Medium
1582	Special Positions in a Binary Matrix	Python	Easy
1584	Min Cost to Connect All Points	Python	Medium
1598	Crawler Log Folder	Python	Easy
1605	Find Valid Matrix Given Row and Column Sums	Python	Medium
1608	Special Array With X Elements Greater Than or Equal X	Python	Easy
1609	Even Odd Tree	Python	Medium
1611	Minimum One Bit Operations to Make Integers Zero	Python	Hard
1614	Maximum Nesting Depth of the Parentheses	Python	Easy
1615	Maximal Network Rank	Python	Medium
1630	Arithmetic Subarrays	Python	Medium
1631	Path With Minimum Effort	Python	Medium
1636	Sort Array by Increasing Frequency	Python	Easy
1637	Widest Vertical Area Between Two Points Containing No Points	Python	Medium
1642	Furthest Building You Can Reach	Python	Medium
1647	Minimum Deletions to Make Character Frequencies Unique	Python	Medium
1653	Minimum Deletions to Make String Balanced	Python	Medium
1657	Determine if Two Strings Are Close	Python	Medium
1658	Minimum Operations to Reduce X to Zero	Python	Medium
1660	Correct a Binary Tree	Python	Medium
1662	Check If Two String Arrays are Equivalent	Python	Easy
1669	Merge In Between Linked Lists	Python	Medium
1683	Invalid Tweets	SQL	Easy
1685	Sum of Absolute Differences in a Sorted Array	Python	Medium
1688	Count of Matches in Tournament	Python	Easy
1700	Number of Students Unable to Eat Lunch	Python	Easy
1701	Average Waiting Time	Python	Medium
1704	Determine if String Halves Are Alike	Python	Easy
1716	Calculate Money in Leetcode Bank	Python	Easy
1717	Maximum Score From Removing Substrings	Python	Medium
1727	Largest Submatrix With Rearrangements	Python	Medium
1740	Find Distance in a Binary Tree	Python	Medium
1743	Restore the Array From Adjacent Pairs	Python	Medium
1750	Minimum Length of String After Deleting Similar Ends	Python	Medium
1757	Recyclable and Low Fat Products	SQL	Medium
1758	Minimum Changes To Make Alternating Binary String	Python	Easy
1759	Count Number of Homogenous Substrings	Python	Medium
1768	Merge Strings Alternately	Python	Easy
1791	Find Center of Star Graph	Python	Easy
1793	Maximum Score of a Good Subarray	Python	Hard
1802	Maximum Value at a Given Index in a Bounded Array	Python	Medium
1804	Implement Trie II (Prefix Tree)	Python	Medium
1814	Count Nice Pairs in an Array	Python	Medium
1836	Remove Duplicates from an Unsorted Linked List	Python	Medium
1838	Frequency of the Most Frequent Element	Python	Medium
1845	Seat Reservation Manager	Python	Medium
1846	Maximum Element After Decreasing and Rearranging	Python	Medium
1863	Sum of All Subset XOR Totals	Python	Easy
1870	Minimum Speed to Arrive on Time	Python	Medium
1877	Minimize Maximum Pair Sum in Array	Python	Medium
1885	Count Pairs in Two Arrays	Python	Medium
1887	Reduction Operations to Make the Array Elements Equal	Python	Medium
1897	Redistribute Characters to Make All Strings Equal	Python	Easy
1903	Largest Odd Number in String	Python	Easy
1913	Maximum Product Difference Between Two Pairs	Python	Easy
1915	Number of Wonderful Substrings	Python	Medium
1920	Build Array from Permutation	C++	Easy
1921	Eliminate Maximum Number of Monsters	Python	Medium
1930	Unique Length-3 Palindromic Subsequences	Python	Medium
1940	Longest Common Subsequence Between Sorted Arrays	Python	Medium
1971	Find if Path Exists in Graph	Python	Easy
1973	Count Nodes Equal to Sum of Descendants	Python	Medium
1980	Find Unique Binary String	Python	Medium
1992	Find All Groups of Farmland	Python	Medium
2000	Reverse Prefix of Word	Python	Easy
2009	Minimum Number of Operations to Make Array Continuous	Python	Hard
2037	Minimum Number of Moves to Seat Everyone	Python	Easy
2038	Remove Colored Pieces if Both Neighbors are the Same Color	Python	Medium
2045	Second Minimum Time to Reach Destination	Python	Hard
2050	Number of Different Integers in a String	Python	Easy
2053	Kth Distinct String in an Array	Python	Easy
2058	Find the Minimum and Maximum Number of Nodes Between Critical Points	Python	Medium
2061	Number of Spaces Cleaning Robot Cleaned	Python	Medium
2073	Time Needed to Buy Tickets	Python	Easy
2083	Substrings That Begin and End With the Same Letter	Python	Medium
2092	Find All People With Secret	Python	Hard
2093	Minimum Cost to Reach City With Discounts	Python	Medium
2096	Step-By-Step Directions From a Binary Tree Node to Another	Python	Medium
2108	Find First Palindromic String in the Array	Python	Medium
2125	Number of Laser Beams in a Bank	Python	Medium
2134	Minimum Swaps to Group All 1's Together II	Python	Medium
2141	Maximum Running Time of N Computers	Python	Hard
2147	Number of Ways to Divide a Long Corridor	Python	Hard
2149	Rearrange Array Elements by Sign	Python	Medium
2181	Merge Nodes in Between Zeros	Python	Medium
2192	All Ancestors of a Node in a Directed Acyclic Graph	Python	Medium
2196	Create Binary Tree From Descriptions	Python	Medium
2225	Find Players With Zero or One Losses	Python	Medium
2251	Number of Flowers in Full Bloom	Python	Hard
2264	Largest 3-Same-Digit Number in String	Python	Easy
2265	Count Nodes Equal to Average of Subtree	Python	Medium
2285	Maximum Total Importance of Roads	Python	Medium
2331	Evaluate Boolean Binary Tree	Python	Easy
2353	Design a Food Rating System	Python	Medium
2355	Maximum Number of Books You Can Take	Python	Hard
2361	Minimum Costs Using the Train Line	Python	Hard
2366	Minimum Replacements to Sort the Array	Python	Hard
2369	Check If There Is a Valid Partition for the Array	Python	Medium
2370	Longest Ideal Subsequence	Python	Medium
2373	Largest Local Values in a Matrix	Python	Easy
2385	Amount of Time for Binary Tree to be Infected	Python	Medium
2391	Minimum Amount of Time to Collect Garbage	Python	Medium
2392	Build a Matrix With Conditions	Python	Hard
2393	Count Strictly Increasing Subarrays	Python	Medium
2402	Meeting Rooms III	Python	Hard
2418	Sort the People	Python	Easy
2433	Find the Original Array of Prefix XOR	Python	Medium
2441	Largest Positive Integer That Exists With Its Negative	Python	Easy
2444	Count Subarrays with Fixed Bounds	Python	Hard
2473	Minimum Cost to Buy Apples	Python	Medium
2482	Difference Between Ones and Zeros in Row and Column	Python	Medium
2483	Minimum Penalty for a Shop	Python	Medium
2485	Find the Pivot Integer	Python	Easy
2486	Append Characters to String to Make Subsequence	Python	Medium
2487	Remove Nodes from Linked List	Python	Medium
2505	Bitwise OR of All Subarrays	Python	Medium
2540	Minimum Common Value	Python	Easy
2582	Pass the Pillow	Python	Easy
2597	The Number of Beautiful Subsets	Python	Medium
2610	Convert an Array into a 2D Array with Conditions	Python	Medium
2616	Minimize the Maximum Difference of Pairs	Python	Medium
2618	Check if Object Instance of Class	TypeScript	Medium
2619	Array.prototype.last	JavaScript, TypeScript	Easy
2620	Counter	JavaScript, TypeScript	Easy
2621	Sleep	JavaScript, TypeScript	Easy
2622	Cache with Time Limit	JavaScript, TypeScript	Medium
2623	Memoize	JavaScript, TypeScript	Medium
2624	Snail Traversal	TypeScript	Medium
2625	Flatten Deeply Nested Array	JavaScript, TypeScript	Medium
2626	Array Reduce Transformation	JavaScript, TypeScript	Easy
2627	Debounce	JavaScript, TypeScript	Medium
2628	JSON Deep Equal	JavaScript, TypeScript	Medium
2629	Function Composition	JavaScript, TypeScript	Easy
2630	Memoize II	TypeScript	Hard
2631	Group By	JavaScript, TypeScript	Medium
2632	Curry	JavaScript, TypeScript	Medium
2633	Convert Object to JSON String	JavaScript, TypeScript	Medium
2634	Filter Elements from Array	JavaScript, TypeScript	Easy
2635	Apply Transform over Each Element in Array	JavaScript, TypeScript	Easy
2636	Promise Pool	JavaScript, TypeScript	Medium
2637	Promise Time Limit	JavaScript, TypeScript	Medium
2642	Design Graph with Shortest Path Calculator	Python	Hard
2648	Generate Fibonacci Sequence	TypeScript	Easy
2649	Nested Array Generator	TypeScript	Medium
2650	Design Cancellable Function	TypeScript	Hard
2665	Counter II	JavaScript, TypeScript	Easy
2666	Allow One Function Call	JavaScript, TypeScript	Easy
2667	Create Hello World Function	JavaScript, TypeScript	Easy
2675	Array of Objects to Matrix	TypeScript	Hard
2676	Throttle	JavaScript, TypeScript	Medium
2677	Chunk Array	JavaScript, TypeScript	Easy
2678	Number of Senior Citizens	Python	Easy
2690	Infinite Method Object	TypeScript	Easy
2692	Make Object Immutable	TypeScript	Medium
2694	Event Emitter	JavaScript	Medium
2695	Array Wrapper	JavaScript	Easy
2703	Return Length of Arguments Passed	JavaScript	Easy
2704	To Be or Not To Be	JavaScript	Easy
2705	Compact Object	JavaScript	Medium
2706	Buy Two Chocolates	Python	Easy
2707	Extra Characters in a String	Python	Medium
2709	Greatest Common Divisor Traversal	Python	Hard
2715	Execute Cancellable Function with Delay	JavaScript	Easy
2721	Execute Asynchronous Functions in Parallel	JavaScript	Medium
2722	Join Two Arrays by ID	JavaScript	Medium
2723	Add Two Promises	JavaScript	Easy
2724	Sort By	JavaScript	Easy
2725	Interval Cancellation	JavaScript	Easy
2726	Calculator with Method Chaining	JavaScript	Easy
2727	Is Object Empty	JavaScript	Easy
2742	Painting the Walls	Python	Hard
2743	Count Substrings Without Repeating Character	Python	Medium
2751	Robot Collisions	Python	Hard
2762	Continuous Subarrays	Python	Medium
2778	Sum of Squares of Special Elements	Python	Easy
2784	Check if Array is Good	Python	Easy
2785	Sort Vowels in a String	Python	Medium
2788	Split Strings by Separator	Python	Easy
2789	Largest Element in an Array after Merge Operations	Python	Medium
2798	Number of Employees Who Met the Target	Python	Easy
2802	Find the K-th Lucky Number	Python	Medium
2806	Account Balance after Rounded Purchase	Python	Easy
2807	Insert Greatest Common Divisors in Linked List	Python	Medium
2810	Faulty Keyboard	Python	Easy
2811	Check If It Is Possible to Split Array	Python	Medium
2812	Find the Safest Path in a Grid	Python	Medium
2816	Double a Number Represented as a Linked List	Python	Medium
2824	Count Pairs Whose Sum Is Less Than Target	Python	Easy
2825	Make String A Subsequence Using Cyclic Increments	Python	Medium
2833	Furthest Point from Origin	Python	Easy
2834	Find the Minimum Possible Sum of a Beautiful Array	Python	Medium
2849	Determine if a Cell is Reachable at a Given Time	Python	Medium
2864	Maximum Odd Binary Number	Python	Easy
2870	Minimum Number of Operations to Make Array Empty	Python	Medium
2958	Length of Longest Subarray with at Most K Frequency	Python	Medium
2962	Count Subarrays Where Max Element Appears at Least K Times	Python	Medium
2966	Divide Array into Arrays with Max Difference	Python	Medium
2971	Find Polygon with the Largest Perimeter	Python	Medium
2976	Minimum Cost to Convert String I	Python	Medium
2997	Minimum Number of Operations to Make Array XOR Equal to Zero	Python	Medium
3005	Count Elements with Maximum Frequency	Python	Easy
3016	Minimum Number of Pushes to Type Word II	Python	Medium
3062	Winner of the Linked List Game	Python	Easy
3063	Linked List Frequency	Python	Medium
3068	Find the Maximum Sum of Node Values	Python	Hard
3075	Maximize Happiness of Selected Children	Python	Medium
3110	Score of a String	Python	Easy

How to Use

Clone the repository:

git clone https://github.com/hogan.tech/leetcode-solutions.git

Choose a Problem:

Browse the folders to find the LeetCode problem you want to solve.

Select a Language:

Inside each problem folder, you'll find solutions in various programming languages. Choose the language you prefer.

Read the ReadMe:

Each problem folder contains a README file with a problem description, approach, and code explanation. Read this to understand the solution.

Explore the Code:

Open the code file to view the implementation. Study the code and adapt it as needed for your use case.

Run the Code:

You can run the code on your local machine to test and modify it as needed.

Contribute:

If you have a better solution or want to contribute in any way, feel free to submit a pull request.

Share Your Feedback:

Welcome feedback and suggestions. If you have any ideas to improve the solutions or find any errors, please let me know.

Happy coding! 🚀

By following these steps, users can easily navigate and utilize your LeetCode solutions repository for their coding needs.

Name		Name	Last commit message	Last commit date
Latest commit History 2,673 Commits
.github		.github
.vscode		.vscode
0001-two-sum		0001-two-sum
0002-add-two-numbers		0002-add-two-numbers
0003-longest-substring-without-repeating-characters		0003-longest-substring-without-repeating-characters
0004-median-of-two-sorted-arrays		0004-median-of-two-sorted-arrays
0005-longest-palindromic-substring		0005-longest-palindromic-substring
0006-zigzag-conversion		0006-zigzag-conversion
0007-reverse-integer		0007-reverse-integer
0008-string-to-integer-atoi		0008-string-to-integer-atoi
0009-palindrome-number		0009-palindrome-number
0010-regular-expression-matching		0010-regular-expression-matching
0011-container-with-most-water		0011-container-with-most-water
0012-integer-to-roman		0012-integer-to-roman
0013-roman-to-integer		0013-roman-to-integer
0014-longest-common-prefix		0014-longest-common-prefix
0015-3sum		0015-3sum
0016-3sum-closest		0016-3sum-closest
0017-letter-combinations-of-a-phone-number		0017-letter-combinations-of-a-phone-number
0018-4sum		0018-4sum
0019-remove-nth-node-from-end-of-list		0019-remove-nth-node-from-end-of-list
0020-valid-parentheses		0020-valid-parentheses
0021-merge-two-sorted-lists		0021-merge-two-sorted-lists
0022-generate-parentheses		0022-generate-parentheses
0023-merge-k-sorted-lists		0023-merge-k-sorted-lists
0024-swap-nodes-in-pairs		0024-swap-nodes-in-pairs
0025-reverse-nodes-in-k-group		0025-reverse-nodes-in-k-group
0026-remove-duplicates-from-sorted-array		0026-remove-duplicates-from-sorted-array
0027-remove-element		0027-remove-element
0028-find-the-index-of-the-first-occurrence-in-a-string		0028-find-the-index-of-the-first-occurrence-in-a-string
0029-divide-two-integers		0029-divide-two-integers
0031-next-permutation		0031-next-permutation
0033-search-in-rotated-sorted-array		0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array		0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position		0035-search-insert-position
0036-valid-sudoku		0036-valid-sudoku
0039-combination-sum		0039-combination-sum
0041-first-missing-positive		0041-first-missing-positive
0042-trapping-rain-water		0042-trapping-rain-water
0045-jump-game-ii		0045-jump-game-ii
0046-permutations		0046-permutations
0048-rotate-image		0048-rotate-image
0049-group-anagrams		0049-group-anagrams
0050-powx-n		0050-powx-n
0053-maximum-subarray		0053-maximum-subarray
0054-spiral-matrix		0054-spiral-matrix
0055-jump-game		0055-jump-game
0056-merge-intervals		0056-merge-intervals
0057-insert-interval		0057-insert-interval
0058-length-of-last-word		0058-length-of-last-word
0059-spiral-matrix-ii		0059-spiral-matrix-ii
0061-rotate-list		0061-rotate-list
0062-unique-paths		0062-unique-paths
0063-unique-paths-ii		0063-unique-paths-ii
0064-minimum-path-sum		0064-minimum-path-sum
0066-plus-one		0066-plus-one
0067-add-binary		0067-add-binary
0068-text-justification		0068-text-justification
0069-sqrtx		0069-sqrtx
0070-climbing-stairs		0070-climbing-stairs
0073-set-matrix-zeroes		0073-set-matrix-zeroes
0074-search-a-2d-matrix		0074-search-a-2d-matrix
0075-sort-colors		0075-sort-colors
0076-minimum-window-substring		0076-minimum-window-substring
0077-combinations		0077-combinations
0078-subsets		0078-subsets
0079-word-search		0079-word-search
0081-search-in-rotated-sorted-array-ii		0081-search-in-rotated-sorted-array-ii
0083-remove-duplicates-from-sorted-list		0083-remove-duplicates-from-sorted-list
0084-largest-rectangle-in-histogram		0084-largest-rectangle-in-histogram
0085-maximal-rectangle		0085-maximal-rectangle
0086-partition-list		0086-partition-list
0088-merge-sorted-array		0088-merge-sorted-array
0090-subsets-ii		0090-subsets-ii
0091-decode-ways		0091-decode-ways
0092-reverse-linked-list-ii		0092-reverse-linked-list-ii
0094-binary-tree-inorder-traversal		0094-binary-tree-inorder-traversal
0095-unique-binary-search-trees-ii		0095-unique-binary-search-trees-ii
0097-interleaving-string		0097-interleaving-string
0098-validate-binary-search-tree		0098-validate-binary-search-tree
0100-same-tree		0100-same-tree
0101-symmetric-tree		0101-symmetric-tree
0102-binary-tree-level-order-traversal		0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree		0104-maximum-depth-of-binary-tree
0105-construct-binary-tree-from-preorder-and-inorder-traversal		0105-construct-binary-tree-from-preorder-and-inorder-traversal
0110-balanced-binary-tree		0110-balanced-binary-tree
0112-path-sum		0112-path-sum
0116-populating-next-right-pointers-in-each-node		0116-populating-next-right-pointers-in-each-node
0118-pascals-triangle		0118-pascals-triangle
0119-pascals-triangle-ii		0119-pascals-triangle-ii
0120-triangle		0120-triangle
0121-best-time-to-buy-and-sell-stock		0121-best-time-to-buy-and-sell-stock
0125-valid-palindrome		0125-valid-palindrome
0127-word-ladder		0127-word-ladder
0128-longest-consecutive-sequence		0128-longest-consecutive-sequence
0129-sum-root-to-leaf-numbers		0129-sum-root-to-leaf-numbers
0131-palindrome-partitioning		0131-palindrome-partitioning
0133-clone-graph		0133-clone-graph
0135-candy		0135-candy
0136-single-number		0136-single-number

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