LeetCode Records (695 solved)

My LeetCode Profile: Zanger

About this Repo

This repo is a collection of my LeetCode solutions, primarily written in Python, Java, and C. On any page, click the main title to be redirected to the official LeetCode page for the question, topic, list, etc. See the Additional Categories section for pages that group questions by different criteria -- e.g. by their related topics.

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Category Notes

1. Daily - Daily challenge questions that were done on the day of
2. Weekly Premium - Weekly premium questions that were done on week of
3. Contest - Questions that I completed during a live contest

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Additional Categories Stats

• Daily Questions

• Weekly Questions

• Questions By Code Length

• Questions By Recent

• Grouped by Topic

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Array, String, Hash Table, Depth-First Search, Math, Tree, Sorting, Binary Tree, Breadth-First Search, Two Pointers, Dynamic Programming, Matrix, Stack, Greedy, Simulation, Linked List, Binary Search, Design, Counting, Bit Manipulation, Heap (Priority Queue), Backtracking, Prefix Sum, Sliding Window, Trie, Graph Theory, Recursion, Database, Binary Search Tree, Union-Find, Queue, Monotonic Stack, Divide and Conquer, String Matching, Geometry, Data Stream, Combinatorics, Number Theory, Hash Function, Shortest Path, Counting Sort, Doubly-Linked List, Enumeration, Game Theory, Rolling Hash, Randomized, Brainteaser, Topological Sort, Ordered Set, Bucket Sort, Memoization, Monotonic Queue, Suffix Array, Iterator, Interactive, Bitmask, Merge Sort, Segment Tree, Quickselect, Strongly Connected Component, Probability and Statistics, Binary Indexed Tree, Reservoir Sampling, Radix Sort

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Questions

#	Title	Level	Cats	Solution	Languages
1	Two Sum	Easy	B75, N150	solution	java, py
2	Add Two Numbers	Medium	N150	solution	java
3	Longest Substring Without Repeating Characters	Medium	B75, N150	solution	java
5	Longest Palindromic Substring	Medium	B75, N150	solution	py
7	Reverse Integer	Medium	N150	solution	py
8	String to Integer (atoi)	Medium		solution	py
9	Palindrome Number	Easy		solution	java
13	Roman to Integer	Easy		solution	py
14	Longest Common Prefix	Easy		solution	java
17	Letter Combinations of a Phone Number	Medium	N150	solution	java
19	Remove Nth Node From End of List	Medium	B75, N150	solution	c, java, py
20	Valid Parentheses	Easy	B75, N150	solution	java
21	Merge Two Sorted Lists	Easy	B75, N150	solution	java
22	Generate Parentheses	Medium	N150	solution	py
23	Merge k Sorted Lists	Hard	B75, N150	solution	py
24	Swap Nodes in Pairs	Medium		solution	c
25	Reverse Nodes in k-Group	Hard	N150	solution	c
26	Remove Duplicates from Sorted Array	Easy		solution	java
27	Remove Element	Easy		solution	java, py
28	Find the Index of the First Occurrence in a String	Easy		solution	py
33	Search in Rotated Sorted Array	Medium	B75, N150	solution	py
36	Valid Sudoku	Medium	N150	solution	py
37	Sudoku Solver	Hard		solution	py
38	Count and Say	Medium		solution	py
39	Combination Sum	Medium	B75, N150	solution	py
40	Combination Sum II	Medium	Daily, N150	solution	py
42	Trapping Rain Water	Hard	N150	solution	py
46	Permutations	Medium	N150	solution	py
48	Rotate Image	Medium	B75, N150	solution	c, py
49	Group Anagrams	Medium	B75, N150	solution	py
50	Pow(x, n)	Medium	N150	solution	c, java, py
53	Maximum Subarray	Medium	B75, N150	solution	py
54	Spiral Matrix	Medium	B75, N150	solution	py
56	Merge Intervals	Medium	B75, N150	solution	py
57	Insert Interval	Medium	B75, N150	solution	py
61	Rotate List	Medium		solution	py
66	Plus One	Easy	N150	solution	c
69	Sqrt(x)	Easy		solution	py
70	Climbing Stairs	Easy	B75, N150	solution	py
71	Simplify Path	Medium		solution	py
74	Search a 2D Matrix	Medium	N150	solution	py
75	Sort Colors	Medium	Daily	solution	c, py
77	Combinations	Medium		solution	py
78	Subsets	Medium	N150	solution	py
79	Word Search	Medium	B75, N150	solution	py
81	Search in Rotated Sorted Array II	Medium		solution	py
82	Remove Duplicates from Sorted List II	Medium		solution	py
83	Remove Duplicates from Sorted List	Easy		solution	py
84	Largest Rectangle in Histogram	Hard	N150	solution	py
90	Subsets II	Medium	N150	solution	py
94	Binary Tree Inorder Traversal	Easy		solution	java, py
98	Validate Binary Search Tree	Medium	B75, N150	solution	c
100	Same Tree	Easy	B75, N150	solution	py
102	Binary Tree Level Order Traversal	Medium	B75, N150	solution	java
103	Binary Tree Zigzag Level Order Traversal	Medium		solution	py
104	Maximum Depth of Binary Tree	Easy	B75, N150	solution	py
107	Binary Tree Level Order Traversal II	Medium		solution	java
110	Balanced Binary Tree	Easy	N150	solution	py
111	Minimum Depth of Binary Tree	Easy		solution	c, java
112	Path Sum	Easy		solution	py
113	Path Sum II	Medium		solution	py
114	Flatten Binary Tree to Linked List	Medium		solution	c, py
118	Pascal's Triangle	Easy		solution	py
120	Triangle	Medium		solution	py
121	Best Time to Buy and Sell Stock	Easy	B75, N150	solution	py
122	Best Time to Buy and Sell Stock II	Medium		solution	py
124	Binary Tree Maximum Path Sum	Hard	B75, N150	solution	py
125	Valid Palindrome	Easy	B75, N150	solution	c, py
128	Longest Consecutive Sequence	Medium	B75, N150	solution	java, py
129	Sum Root to Leaf Numbers	Medium		solution	py
131	Palindrome Partitioning	Medium	N150	solution	py
136	Single Number	Easy	N150	solution	py
138	Copy List with Random Pointer	Medium	N150	solution	py
141	Linked List Cycle	Easy	B75, N150	solution	c, py
142	Linked List Cycle II	Medium		solution	py
143	Reorder List	Medium	B75, N150	solution	java, py
145	Binary Tree Postorder Traversal	Easy		solution	py
146	LRU Cache	Medium	N150	solution	py
149	Max Points on a Line	Hard		solution	py
150	Evaluate Reverse Polish Notation	Medium	N150	solution	py
155	Min Stack	Medium	N150	solution	py
165	Compare Version Numbers	Medium		solution	c, py
166	Fraction to Recurring Decimal	Medium		solution	py
167	Two Sum II - Input Array Is Sorted	Medium	N150	solution	py
170	Two Sum III - Data structure design	Easy		solution	py
173	Binary Search Tree Iterator	Medium		solution	py
175	Combine Two Tables	Easy		solution	py, sql
176	Second Highest Salary	Medium		solution	sql
177	Nth Highest Salary	Medium		solution	sql
181	Employees Earning More Than Their Managers	Easy		solution	sql
182	Duplicate Emails	Easy		solution	sql
183	Customers Who Never Order	Easy		solution	sql
184	Department Highest Salary	Medium		solution	sql
189	Rotate Array	Medium		solution	py
191	Number of 1 Bits	Easy	B75, N150	solution	py
196	Delete Duplicate Emails	Easy		solution	py, sql
197	Rising Temperature	Easy		solution	sql
198	House Robber	Medium	B75, N150	solution	py
199	Binary Tree Right Side View	Medium	N150	solution	cpp, java
200	Number of Islands	Medium	B75, N150	solution	py
206	Reverse Linked List	Easy	B75, N150	solution	java
208	Implement Trie (Prefix Tree)	Medium	B75, N150	solution	py
211	Design Add and Search Words Data Structure	Medium	B75, N150	solution	py
212	Word Search II	Hard	B75, N150	solution	py
213	House Robber II	Medium	B75, N150	solution	py
217	Contains Duplicate	Easy	B75, N150	solution	py
224	Basic Calculator	Hard		solution	py
226	Invert Binary Tree	Easy	B75, N150	solution	py
227	Basic Calculator II	Medium		solution	py
230	Kth Smallest Element in a BST	Medium	B75, N150	solution	py
231	Power of Two	Easy		solution	py
235	Lowest Common Ancestor of a Binary Search Tree	Medium	B75, N150	solution	py
236	Lowest Common Ancestor of a Binary Tree	Medium	B75	solution	py
238	Product of Array Except Self	Medium	B75, N150	solution	py
239	Sliding Window Maximum	Hard	N150	solution	py
242	Valid Anagram	Easy	B75, N150	solution	c, py
251	Flatten 2D Vector	Medium		solution	py
253	Meeting Rooms II	Medium	B75, N150	solution	py
260	Single Number III	Medium		solution	py
261	Graph Valid Tree	Medium	B75, N150	solution	py
266	Palindrome Permutation	Easy		solution	py
271	Encode and Decode Strings	Medium	B75, N150	solution	py
272	Closest Binary Search Tree Value II	Hard		solution	py
273	Integer to English Words	Hard	Daily	solution	py
286	Walls and Gates	Medium	N150	solution	py
287	Find the Duplicate Number	Medium	N150	solution	c
292	Nim Game	Easy		solution	py
302	Smallest Rectangle Enclosing Black Pixels	Hard		solution	py
314	Binary Tree Vertical Order Traversal	Medium		solution	py
317	Shortest Distance from All Buildings	Hard		solution	py
320	Generalized Abbreviation	Medium		solution	py
322	Coin Change	Medium	B75, N150	solution	py
323	Number of Connected Components in an Undirected Graph	Medium	B75, N150	solution	py
325	Maximum Size Subarray Sum Equals k	Medium		solution	py
326	Power of Three	Easy		solution	py
328	Odd Even Linked List	Medium		solution	py
330	Patching Array	Hard	Daily	solution	py
339	Nested List Weight Sum	Medium		solution	c, py
341	Flatten Nested List Iterator	Medium		solution	java
342	Power of Four	Easy		solution	py
344	Reverse String	Easy	Daily	solution	java, py
345	Reverse Vowels of a String	Easy		solution	py
347	Top K Frequent Elements	Medium	B75, N150	solution	py
348	Design Tic-Tac-Toe	Medium		solution	py
350	Intersection of Two Arrays II	Easy	Daily	solution	java, py
351	Android Unlock Patterns	Medium	Weekly Premium	solution	py
353	Design Snake Game	Medium		solution	py
359	Logger Rate Limiter	Easy		solution	py
362	Design Hit Counter	Medium		solution	py
364	Nested List Weight Sum II	Medium		solution	java, py
366	Find Leaves of Binary Tree	Medium		solution	py
369	Plus One Linked List	Medium		solution	c
374	Guess Number Higher or Lower	Easy		solution	java, py
380	Insert Delete GetRandom O(1)	Medium		solution	java
381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard		solution	java
382	Linked List Random Node	Medium		solution	c, java, py
384	Shuffle an Array	Medium		solution	py
392	Is Subsequence	Easy		solution	java
394	Decode String	Medium		solution	py
408	Valid Word Abbreviation	Easy		solution	py
409	Longest Palindrome	Easy	Daily	solution	c, py
412	Fizz Buzz	Easy		solution	java, py
414	Third Maximum Number	Easy		solution	py
415	Add Strings	Easy		solution	py
416	Partition Equal Subset Sum	Medium	N150	solution	py
419	Battleships in a Board	Medium		solution	c, py
424	Longest Repeating Character Replacement	Medium	B75, N150	solution	py
426	Convert Binary Search Tree to Sorted Doubly Linked List	Medium		solution	py
429	N-ary Tree Level Order Traversal	Medium		solution	py
430	Flatten a Multilevel Doubly Linked List	Medium		solution	cpp, java
431	Encode N-ary Tree to Binary Tree	Hard		solution	java, py
437	Path Sum III	Medium		solution	py
443	String Compression	Medium		solution	py
450	Delete Node in a BST	Medium		solution	py
451	Sort Characters By Frequency	Medium		solution	py
460	LFU Cache	Hard		solution	py
475	Heaters	Medium		solution	py
476	Number Complement	Easy		solution	py
480	Sliding Window Median	Hard		solution	py
487	Max Consecutive Ones II	Medium		solution	py
495	Teemo Attacking	Easy		solution	py
498	Diagonal Traverse	Medium		solution	go, py
502	IPO	Hard	Daily	solution	py
503	Next Greater Element II	Medium		solution	py
509	Fibonacci Number	Easy		solution	c
513	Find Bottom Left Tree Value	Medium		solution	java
523	Continuous Subarray Sum	Medium	Daily	solution	py
528	Random Pick with Weight	Medium		solution	py
535	Encode and Decode TinyURL	Medium		solution	py
540	Single Element in a Sorted Array	Medium		solution	py
542	01 Matrix	Medium		solution	py
543	Diameter of Binary Tree	Easy	N150	solution	c, java, py
559	Maximum Depth of N-ary Tree	Easy		solution	py
565	Array Nesting	Medium		solution	py
567	Permutation in String	Medium	N150	solution	py
572	Subtree of Another Tree	Easy	B75, N150	solution	py
577	Employee Bonus	Easy		solution	sql
584	Find Customer Referee	Easy		solution	sql
586	Customer Placing the Largest Number of Orders	Easy		solution	sql
590	N-ary Tree Postorder Traversal	Easy		solution	py
595	Big Countries	Easy		solution	sql
596	Classes With at Least 5 Students	Easy		solution	sql
605	Can Place Flowers	Easy		solution	c, cpp, java, js, py, rs, ts
606	Construct String from Binary Tree	Medium		solution	java, py
607	Sales Person	Easy		solution	sql
611	Valid Triangle Number	Medium		solution	py
616	Add Bold Tag in String	Medium		solution	py
619	Biggest Single Number	Easy		solution	sql
622	Design Circular Queue	Medium		solution	py
624	Maximum Distance in Arrays	Medium		solution	py
636	Exclusive Time of Functions	Medium		solution	py
637	Average of Levels in Binary Tree	Easy		solution	py
641	Design Circular Deque	Medium		solution	py
645	Set Mismatch	Easy		solution	java, py
647	Palindromic Substrings	Medium	B75, N150	solution	py
648	Replace Words	Medium	Daily	solution	java, py
650	2 Keys Keyboard	Medium		solution	py
651	4 Keys Keyboard	Medium		solution	py
653	Two Sum IV - Input is a BST	Easy		solution	py
654	Maximum Binary Tree	Medium		solution	py
662	Maximum Width of Binary Tree	Medium		solution	py
663	Equal Tree Partition	Medium		solution	py
664	Strange Printer	Hard		solution	py
665	Non-decreasing Array	Medium		solution	java, py
666	Path Sum IV	Medium		solution	py
676	Implement Magic Dictionary	Medium		solution	py
684	Redundant Connection	Medium	N150	solution	py
687	Longest Univalue Path	Medium		solution	py
690	Employee Importance	Medium		solution	java
692	Top K Frequent Words	Medium		solution	py
695	Max Area of Island	Medium	N150	solution	c
700	Search in a Binary Search Tree	Easy		solution	c, java, py
703	Kth Largest Element in a Stream	Easy	Daily, N150	solution	py
707	Design Linked List	Medium		solution	java
708	Insert into a Sorted Circular Linked List	Medium		solution	py
713	Subarray Product Less Than K	Medium		solution	py
717	1-bit and 2-bit Characters	Easy		solution	py
719	Find K-th Smallest Pair Distance	Hard	Daily	solution	py
720	Longest Word in Dictionary	Medium		solution	py
725	Split Linked List in Parts	Medium		solution	py
726	Number of Atoms	Hard	Daily	solution	py
729	My Calendar I	Medium		solution	py
735	Asteroid Collision	Medium		solution	py
739	Daily Temperatures	Medium	N150	solution	c, java, py
743	Network Delay Time	Medium	N150	solution	java, py
744	Find Smallest Letter Greater Than Target	Easy		solution	java, py
746	Min Cost Climbing Stairs	Easy	N150	solution	py
758	Bold Words in String	Medium		solution	py
771	Jewels and Stones	Easy		solution	java, py
776	Split BST	Medium	Weekly Premium	solution	py
781	Rabbits in Forest	Medium		solution	py
784	Letter Case Permutation	Medium		solution	py
791	Custom Sort String	Medium		solution	java
792	Number of Matching Subsequences	Medium		solution	py
794	Valid Tic-Tac-Toe State	Medium		solution	py
796	Rotate String	Easy		solution	py
797	All Paths From Source to Target	Medium		solution	py
807	Max Increase to Keep City Skyline	Medium		solution	java
812	Largest Triangle Area	Easy		solution	py
817	Linked List Components	Medium		solution	java
819	Most Common Word	Easy		solution	py
826	Most Profit Assigning Work	Medium	Daily	solution	py
827	Making A Large Island	Hard		solution	py
840	Magic Squares In Grid	Medium	Daily	solution	py
846	Hand of Straights	Medium	Daily, N150	solution	py
848	Shifting Letters	Medium		solution	py
849	Maximize Distance to Closest Person	Medium		solution	py
853	Car Fleet	Medium	N150	solution	py
856	Score of Parentheses	Medium		solution	py
860	Lemonade Change	Easy	Daily	solution	py
861	Score After Flipping Matrix	Medium		solution	c, py
863	All Nodes Distance K in Binary Tree	Medium		solution	py
867	Transpose Matrix	Easy		solution	py
871	Minimum Number of Refueling Stops	Hard		solution	py
874	Walking Robot Simulation	Medium		solution	py
877	Stone Game	Medium		solution	c, cpp, go, java, js, py
885	Spiral Matrix III	Medium	Daily	solution	py
890	Find and Replace Pattern	Medium		solution	py
894	All Possible Full Binary Trees	Medium		solution	py
895	Maximum Frequency Stack	Hard		solution	java, py
909	Snakes and Ladders	Medium		solution	py
912	Sort an Array	Medium	Daily	solution	java, py
919	Complete Binary Tree Inserter	Medium		solution	py
921	Minimum Add to Make Parentheses Valid	Medium		solution	java, py
930	Binary Subarrays With Sum	Medium		solution	py
938	Range Sum of BST	Easy		solution	js, py
939	Minimum Area Rectangle	Medium		solution	py
942	DI String Match	Easy		solution	py
945	Minimum Increment to Make Array Unique	Medium	Daily	solution	py
946	Validate Stack Sequences	Medium		solution	c, py
950	Reveal Cards In Increasing Order	Medium		solution	py
951	Flip Equivalent Binary Trees	Medium		solution	py
959	Regions Cut By Slashes	Medium	Daily	solution	py
973	K Closest Points to Origin	Medium	N150	solution	py
974	Subarray Sums Divisible by K	Medium	Daily	solution	java, py
976	Largest Perimeter Triangle	Easy		solution	py
977	Squares of a Sorted Array	Easy		solution	py
979	Distribute Coins in Binary Tree	Medium		solution	py
981	Time Based Key-Value Store	Medium	N150	solution	py
987	Vertical Order Traversal of a Binary Tree	Hard		solution	py
993	Cousins in Binary Tree	Easy		solution	py
994	Rotting Oranges	Medium	N150	solution	py
995	Minimum Number of K Consecutive Bit Flips	Hard	Daily	solution	c, py
1002	Find Common Characters	Easy		solution	py
1004	Max Consecutive Ones III	Medium		solution	py
1006	Clumsy Factorial	Medium		solution	c, py
1008	Construct Binary Search Tree from Preorder Traversal	Medium		solution	c, cpp, java
1018	Binary Prefix Divisible By 5	Easy		solution	py
1019	Next Greater Node In Linked List	Medium		solution	py
1020	Number of Enclaves	Medium		solution	py
1026	Maximum Difference Between Node and Ancestor	Medium		solution	py
1028	Recover a Tree From Preorder Traversal	Hard		solution	py
1030	Matrix Cells in Distance Order	Easy		solution	py
1038	Binary Search Tree to Greater Sum Tree	Medium	Daily	solution	c
1046	Last Stone Weight	Easy	N150	solution	py
1051	Height Checker	Easy	Daily	solution	c, py
1052	Grumpy Bookstore Owner	Medium		solution	py
1055	Shortest Way to Form String	Medium		solution	py
1062	Longest Repeating Substring	Medium	Weekly Premium	solution	py
1068	Product Sales Analysis I	Easy		solution	sql
1071	Greatest Common Divisor of Strings	Easy		solution	py
1079	Letter Tile Possibilities	Medium		solution	py
1087	Brace Expansion	Medium		solution	py
1092	Shortest Common Supersequence	Hard		solution	py
1100	Find K-Length Substrings With No Repeated Characters	Medium		solution	py
1101	The Earliest Moment When Everyone Become Friends	Medium	Weekly Premium	solution	py
1105	Filling Bookcase Shelves	Medium	Daily	solution	py
1110	Delete Nodes And Return Forest	Medium	Daily	solution	py
1122	Relative Sort Array	Easy	Daily	solution	java, py
1133	Largest Unique Number	Easy		solution	py
1140	Stone Game II	Medium		solution	py
1150	Check If a Number Is Majority Element in a Sorted Array	Easy		solution	py
1151	Minimum Swaps to Group All 1's Together	Medium		solution	py
1160	Find Words That Can Be Formed by Characters	Easy		solution	py
1161	Maximum Level Sum of a Binary Tree	Medium		solution	py
1166	Design File System	Medium		solution	py
1171	Remove Zero Sum Consecutive Nodes from Linked List	Medium		solution	py
1181	Before and After Puzzle	Medium		solution	py
1182	Shortest Distance to Target Color	Medium		solution	py
1184	Distance Between Bus Stops	Easy		solution	py
1190	Reverse Substrings Between Each Pair of Parentheses	Medium	Daily	solution	py
1197	Minimum Knight Moves	Medium		solution	py
1198	Find Smallest Common Element in All Rows	Medium		solution	py
1203	Sort Items by Groups Respecting Dependencies	Hard		solution	py
1207	Unique Number of Occurrences	Easy		solution	py
1209	Remove All Adjacent Duplicates in String II	Medium		solution	py
1214	Two Sum BSTs	Medium		solution	py
1218	Longest Arithmetic Subsequence of Given Difference	Medium		solution	py
1229	Meeting Scheduler	Medium		solution	py
1230	Toss Strange Coins	Medium	Weekly Premium	solution	c, java, py
1232	Check If It Is a Straight Line	Easy		solution	py
1233	Remove Sub-Folders from the Filesystem	Medium		solution	py
1239	Maximum Length of a Concatenated String with Unique Characters	Medium		solution	py
1248	Count Number of Nice Subarrays	Medium	Daily	solution	py
1249	Minimum Remove to Make Valid Parentheses	Medium		solution	py
1252	Cells with Odd Values in a Matrix	Easy		solution	c
1254	Number of Closed Islands	Medium		solution	py
1255	Maximum Score Words Formed by Letters	Hard		solution	py
1261	Find Elements in a Contaminated Binary Tree	Medium		solution	py
1265	Print Immutable Linked List in Reverse	Medium		solution	c, py
1267	Count Servers that Communicate	Medium		solution	py
1268	Search Suggestions System	Medium		solution	py
1282	Group the People Given the Group Size They Belong To	Medium		solution	py
1284	Minimum Number of Flips to Convert Binary Matrix to Zero Matrix	Hard		solution	py
1295	Find Numbers with Even Number of Digits	Easy		solution	go, py
1296	Divide Array in Sets of K Consecutive Numbers	Medium		solution	py
1302	Deepest Leaves Sum	Medium		solution	c, js, py
1304	Find N Unique Integers Sum up to Zero	Easy		solution	py
1305	All Elements in Two Binary Search Trees	Medium		solution	java
1315	Sum of Nodes with Even-Valued Grandparent	Medium		solution	py
1317	Convert Integer to the Sum of Two No-Zero Integers	Easy		solution	c
1325	Delete Leaves With a Given Value	Medium		solution	py
1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium	Daily	solution	py
1342	Number of Steps to Reduce a Number to Zero	Easy		solution	py
1351	Count Negative Numbers in a Sorted Matrix	Easy		solution	java, py
1358	Number of Substrings Containing All Three Characters	Medium		solution	py
1367	Linked List in Binary Tree	Medium		solution	py
1368	Minimum Cost to Make at Least One Valid Path in a Grid	Hard		solution	py
1372	Longest ZigZag Path in a Binary Tree	Medium		solution	py
1376	Time Needed to Inform All Employees	Medium		solution	py
1380	Lucky Numbers in a Matrix	Easy	Daily	solution	js, py
1381	Design a Stack With Increment Operation	Medium		solution	py
1382	Balance a Binary Search Tree	Medium		solution	py
1395	Count Number of Teams	Medium	Daily	solution	py
1399	Count Largest Group	Easy		solution	py
1400	Construct K Palindrome Strings	Medium		solution	py
1404	Number of Steps to Reduce a Number in Binary Representation to One	Medium		solution	py
1408	String Matching in an Array	Easy		solution	py
1415	The k-th Lexicographical String of All Happy Strings of Length n	Medium		solution	py
1422	Maximum Score After Splitting a String	Easy		solution	c, py
1426	Counting Elements	Easy		solution	c
1427	Perform String Shifts	Easy		solution	py
1429	First Unique Number	Medium		solution	py
1436	Destination City	Easy		solution	java
1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Medium	Daily	solution	java
1442	Count Triplets That Can Form Two Arrays of Equal XOR	Medium		solution	py
1448	Count Good Nodes in Binary Tree	Medium	N150	solution	java
1452	People Whose List of Favorite Companies Is Not a Subset of Another List	Medium		solution	py
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	Easy		solution	py
1457	Pseudo-Palindromic Paths in a Binary Tree	Medium		solution	py
1460	Make Two Arrays Equal by Reversing Subarrays	Easy	Daily	solution	c, py
1461	Check If a String Contains All Binary Codes of Size K	Medium		solution	py
1462	Course Schedule IV	Medium		solution	py
1470	Shuffle the Array	Easy		solution	c
1472	Design Browser History	Medium		solution	py
1474	Delete N Nodes After M Nodes of a Linked List	Easy		solution	c, java
1475	Final Prices With a Special Discount in a Shop	Easy		solution	py
1481	Least Number of Unique Integers after K Removals	Medium		solution	py
1482	Minimum Number of Days to Make m Bouquets	Medium	Daily	solution	py
1490	Clone N-ary Tree	Medium		solution	java, py
1493	Longest Subarray of 1's After Deleting One Element	Medium		solution	py
1497	Check If Array Pairs Are Divisible by k	Medium		solution	py
1502	Can Make Arithmetic Progression From Sequence	Easy		solution	c, py
1508	Range Sum of Sorted Subarray Sums	Medium	Daily	solution	py
1509	Minimum Difference Between Largest and Smallest Value in Three Moves	Medium	Daily	solution	c, cpp, java, py
1518	Water Bottles	Easy	Daily	solution	c, cpp, cs, java, js, py, ts
1522	Diameter of N-Ary Tree	Medium		solution	py
1524	Number of Sub-arrays With Odd Sum	Medium		solution	py
1525	Number of Good Ways to Split a String	Medium		solution	py
1530	Number of Good Leaf Nodes Pairs	Medium	Daily	solution	py
1534	Count Good Triplets	Easy		solution	c, py
1535	Find the Winner of an Array Game	Medium		solution	py
1550	Three Consecutive Odds	Easy	Daily	solution	c, py
1551	Minimum Operations to Make Array Equal	Medium		solution	c, java, js, kt, py, rb, rs
1552	Magnetic Force Between Two Balls	Medium	Daily	solution	py
1561	Maximum Number of Coins You Can Get	Medium		solution	py
1564	Put Boxes Into the Warehouse I	Medium		solution	py
1568	Minimum Number of Days to Disconnect Island	Hard	Daily	solution	py
1570	Dot Product of Two Sparse Vectors	Medium		solution	c, java, py
1578	Minimum Time to Make Rope Colorful	Medium		solution	py
1579	Remove Max Number of Edges to Keep Graph Fully Traversable	Hard	Daily	solution	py
1580	Put Boxes Into the Warehouse II	Medium	Weekly Premium	solution	py
1598	Crawler Log Folder	Easy	Daily	solution	c, js
1602	Find Nearest Right Node in Binary Tree	Medium		solution	java, py
1605	Find Valid Matrix Given Row and Column Sums	Medium	Daily	solution	py
1609	Even Odd Tree	Medium		solution	py
1634	Add Two Polynomials Represented as Linked Lists	Medium		solution	py
1636	Sort Array by Increasing Frequency	Easy	Daily	solution	py
1641	Count Sorted Vowel Strings	Medium		solution	c, cpp, java
1642	Furthest Building You Can Reach	Medium		solution	py
1650	Lowest Common Ancestor of a Binary Tree III	Medium		solution	py
1653	Minimum Deletions to Make String Balanced	Medium	Daily	solution	py
1657	Determine if Two Strings Are Close	Medium		solution	py
1660	Correct a Binary Tree	Medium		solution	py
1669	Merge In Between Linked Lists	Medium		solution	c
1676	Lowest Common Ancestor of a Binary Tree IV	Medium		solution	py
1684	Count the Number of Consistent Strings	Easy		solution	c, py
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	Medium		solution	c, java
1696	Jump Game VI	Medium		solution	java, py
1698	Number of Distinct Substrings in a String	Medium		solution	java, py
1700	Number of Students Unable to Eat Lunch	Easy		solution	py
1701	Average Waiting Time	Medium	Daily	solution	js, py
1716	Calculate Money in Leetcode Bank	Easy		solution	py
1717	Maximum Score From Removing Substrings	Medium	Daily	solution	py
1718	Construct the Lexicographically Largest Valid Sequence	Medium		solution	py
1721	Swapping Nodes in a Linked List	Medium		solution	c
1730	Shortest Path to Get Food	Medium		solution	py
1736	Latest Time by Replacing Hidden Digits	Easy		solution	c
1740	Find Distance in a Binary Tree	Medium	Weekly Premium	solution	py
1743	Restore the Array From Adjacent Pairs	Medium		solution	py
1748	Sum of Unique Elements	Easy		solution	c
1749	Maximum Absolute Sum of Any Subarray	Medium		solution	py
1752	Check if Array Is Sorted and Rotated	Easy		solution	py
1756	Design Most Recently Used Queue	Medium		solution	py
1759	Count Number of Homogenous Substrings	Medium		solution	c, java
1762	Buildings With an Ocean View	Medium		solution	py
1768	Merge Strings Alternately	Easy		solution	java
1780	Check if Number is a Sum of Powers of Three	Medium		solution	py
1783	Grand Slam Titles	Medium		solution	sql
1791	Find Center of Star Graph	Easy	Daily	solution	c, cpp, java, py
1792	Maximum Average Pass Ratio	Medium		solution	py
1800	Maximum Ascending Subarray Sum	Easy		solution	py
1801	Number of Orders in the Backlog	Medium		solution	py
1804	Implement Trie II (Prefix Tree)	Medium		solution	py
1822	Sign of the Product of an Array	Easy		solution	c
1823	Find the Winner of the Circular Game	Medium	Daily	solution	c, cpp, java, js, py
1833	Maximum Ice Cream Bars	Medium		solution	c, java, py
1836	Remove Duplicates From an Unsorted Linked List	Medium	Weekly Premium	solution	java, py
1844	Replace All Digits with Characters	Easy		solution	py
1852	Distinct Numbers in Each Subarray	Medium		solution	java, py
1858	Longest Word With All Prefixes	Medium		solution	py
1874	Minimize Product Sum of Two Arrays	Medium		solution	c, java
1877	Minimize Maximum Pair Sum in Array	Medium		solution	py
1884	Egg Drop With 2 Eggs and N Floors	Medium		solution	c, java, js
1885	Count Pairs in Two Arrays	Medium		solution	py
1905	Count Sub Islands	Medium		solution	py
1909	Remove One Element to Make the Array Strictly Increasing	Easy		solution	c
1910	Remove All Occurrences of a Substring	Medium		solution	py
1922	Count Good Numbers	Medium		solution	py
1929	Concatenation of Array	Easy		solution	c, java, py
1935	Maximum Number of Words You Can Type	Easy		solution	py
1940	Longest Common Subsequence Between Sorted Arrays	Medium	Weekly Premium	solution	java, py
1944	Number of Visible People in a Queue	Hard		solution	py
1945	Sum of Digits of String After Convert	Easy		solution	py
1957	Delete Characters to Make Fancy String	Easy		solution	py
1973	Count Nodes Equal to Sum of Descendants	Medium		solution	c
1980	Find Unique Binary String	Medium		solution	c, py
1992	Find All Groups of Farmland	Medium		solution	java, py
2011	Final Value of Variable After Performing Operations	Easy		solution	c
2013	Detect Squares	Medium	N150	solution	py
2037	Minimum Number of Moves to Seat Everyone	Easy	Daily	solution	c, py
2043	Simple Bank System	Medium		solution	py
2045	Second Minimum Time to Reach Destination	Hard	Daily	solution	py
2046	Sort Linked List Already Sorted Using Absolute Values	Medium		solution	py
2048	Next Greater Numerically Balanced Number	Medium		solution	py
2053	Kth Distinct String in an Array	Easy	Daily	solution	py
2058	Find the Minimum and Maximum Number of Nodes Between Critical Points	Medium	Daily	solution	cpp, java, py
2063	Vowels of All Substrings	Medium		solution	py
2083	Substrings That Begin and End With the Same Letter	Medium	Weekly Premium	solution	c, py
2085	Count Common Words With One Occurrence	Easy		solution	py
2086	Minimum Number of Food Buckets to Feed the Hamsters	Medium		solution	java
2093	Minimum Cost to Reach City With Discounts	Medium	Weekly Premium	solution	py
2095	Delete the Middle Node of a Linked List	Medium		solution	c, java
2096	Step-By-Step Directions From a Binary Tree Node to Another	Medium	Daily	solution	py
2125	Number of Laser Beams in a Bank	Medium		solution	py
2130	Maximum Twin Sum of a Linked List	Medium		solution	py
2134	Minimum Swaps to Group All 1's Together II	Medium	Daily	solution	py
2145	Count the Hidden Sequences	Medium		solution	py
2149	Rearrange Array Elements by Sign	Medium		solution	c, py
2154	Keep Multiplying Found Values by Two	Easy		solution	py
2161	Partition Array According to Given Pivot	Medium		solution	py
2165	Smallest Value of the Rearranged Number	Medium		solution	py
2169	Count Operations to Obtain Zero	Easy		solution	py
2181	Merge Nodes in Between Zeros	Medium	Daily	solution	c, cpp, java, py
2191	Sort the Jumbled Numbers	Medium	Daily	solution	py
2192	All Ancestors of a Node in a Directed Acyclic Graph	Medium	Daily	solution	java, py
2196	Create Binary Tree From Descriptions	Medium	Daily	solution	py
2206	Divide Array Into Equal Pairs	Easy		solution	c, py
2211	Count Collisions on a Road	Medium		solution	py
2221	Find Triangular Sum of an Array	Medium		solution	c, java, py
2225	Find Players With Zero or One Losses	Medium		solution	java
2235	Add Two Integers	Easy		solution	py
2248	Intersection of Multiple Arrays	Easy		solution	py
2258	Escape the Spreading Fire	Hard		solution	py
2265	Count Nodes Equal to Average of Subtree	Medium		solution	js, py
2268	Minimum Number of Keypresses	Medium		solution	py
2285	Maximum Total Importance of Roads	Medium	Daily	solution	c, cpp, java, py
2302	Count Subarrays With Score Less Than K	Hard		solution	py
2304	Minimum Path Cost in a Grid	Medium		solution	py
2317	Maximum XOR After Operations	Medium		solution	c, cpp, java, py
2342	Max Sum of a Pair With Equal Sum of Digits	Medium		solution	py
2348	Number of Zero-Filled Subarrays	Medium		solution	py
2349	Design a Number Container System	Medium		solution	py
2352	Equal Row and Column Pairs	Medium		solution	py
2365	Task Scheduler II	Medium		solution	py
2374	Node With Highest Edge Score	Medium		solution	py
2375	Construct Smallest Number From DI String	Medium		solution	py
2379	Minimum Recolors to Get K Consecutive Black Blocks	Easy		solution	py
2385	Amount of Time for Binary Tree to Be Infected	Medium		solution	py
2389	Longest Subsequence With Limited Sum	Easy		solution	py
2390	Removing Stars From a String	Medium		solution	java, py
2392	Build a Matrix With Conditions	Hard	Daily	solution	py
2393	Count Strictly Increasing Subarrays	Medium		solution	py
2395	Find Subarrays With Equal Sum	Easy		solution	py
2396	Strictly Palindromic Number	Medium		solution	c, cpp, java, js, kt, py, rb, rs
2405	Optimal Partition of String	Medium		solution	py
2415	Reverse Odd Levels of Binary Tree	Medium		solution	py
2416	Sum of Prefix Scores of Strings	Hard		solution	py
2418	Sort the People	Easy	Daily	solution	py
2423	Remove Letter To Equalize Frequency	Easy		solution	py
2425	Bitwise XOR of All Pairings	Medium		solution	py
2433	Find The Original Array of Prefix Xor	Medium		solution	py
2451	Odd String Difference	Easy		solution	py
2455	Average Value of Even Numbers That Are Divisible by Three	Easy		solution	java
2458	Height of Binary Tree After Subtree Removal Queries	Hard		solution	py
2460	Apply Operations to an Array	Easy		solution	py
2473	Minimum Cost to Buy Apples	Medium		solution	py
2482	Difference Between Ones and Zeros in Row and Column	Medium		solution	py
2483	Minimum Penalty for a Shop	Medium		solution	py
2486	Append Characters to String to Make Subsequence	Medium	Daily	solution	c, java, py
2487	Remove Nodes From Linked List	Medium		solution	py
2493	Divide Nodes Into the Maximum Number of Groups	Hard		solution	py
2501	Longest Square Streak in an Array	Medium		solution	py
2523	Closest Prime Numbers in Range	Medium		solution	py
2529	Maximum Count of Positive Integer and Negative Integer	Easy		solution	py
2545	Sort the Students by Their Kth Score	Medium		solution	java, py
2570	Merge Two 2D Arrays by Summing Values	Easy		solution	c, py
2579	Count Total Number of Colored Cells	Medium		solution	py
2582	Pass the Pillow	Easy	Daily	solution	c, cpp, cs, java, js, py
2583	Kth Largest Sum in a Binary Tree	Medium		solution	py
2594	Minimum Time to Repair Cars	Medium		solution	py
2598	Smallest Missing Non-negative Integer After Operations	Medium		solution	py
2599	Make the Prefix Sum Non-negative	Medium		solution	py
2610	Convert an Array Into a 2D Array With Conditions	Medium		solution	py
2619	Array Prototype Last	Easy		solution	js
2620	Counter	Easy		solution	js
2621	Sleep	Easy		solution	js
2623	Memoize	Medium		solution	js
2624	Snail Traversal	Medium		solution	js
2626	Array Reduce Transformation	Easy		solution	js
2629	Function Composition	Easy		solution	js
2634	Filter Elements from Array	Easy		solution	js
2635	Apply Transform Over Each Element in Array	Easy		solution	js
2658	Maximum Number of Fish in a Grid	Medium		solution	py
2661	First Completely Painted Row or Column	Medium		solution	py
2664	The Knight’s Tour	Medium		solution	py
2665	Counter II	Easy		solution	js
2666	Allow One Function Call	Easy		solution	js
2667	Create Hello World Function	Easy		solution	js
2671	Frequency Tracker	Medium		solution	py
2678	Number of Senior Citizens	Easy	Daily	solution	c, java, py
2679	Sum in a Matrix	Medium		solution	java
2683	Neighboring Bitwise XOR	Medium		solution	c, java, py
2684	Maximum Number of Moves in a Grid	Medium		solution	py
2698	Find the Punishment Number of an Integer	Medium		solution	py
2703	Return Length of Arguments Passed	Easy		solution	js, ts
2704	To Be Or Not To Be	Easy		solution	js
2723	Add Two Promises	Easy		solution	js
2734	Lexicographically Smallest String After Substring Operation	Medium		solution	py
2743	Count Substrings Without Repeating Character	Medium	Weekly Premium	solution	java, py
2751	Robot Collisions	Hard	Daily	solution	py
2785	Sort Vowels in a String	Medium		solution	py
2796	Repeat String	Easy		solution	js
2807	Insert Greatest Common Divisors in Linked List	Medium		solution	py
2816	Double a Number Represented as a Linked List	Medium		solution	c
2843	Count Symmetric Integers	Easy		solution	py
2852	Sum of Remoteness of All Cells	Medium		solution	py
2873	Maximum Value of an Ordered Triplet I	Easy		solution	py
2886	Change Data Type	Easy		solution	py
2894	Divisible and Non-divisible Sums Difference	Easy		solution	py
2942	Find Words Containing Character	Easy		solution	c
2954	Count the Number of Infection Sequences	Hard		solution	py
2955	Number of Same-End Substrings	Medium		solution	py
2965	Find Missing and Repeated Values	Easy		solution	py
2976	Minimum Cost to Convert String I	Medium	Daily	solution	py
2979	Most Expensive Item That Can Not Be Bought	Medium		solution	c, cpp, go, java, js, kt, py, rs, swift, ts
2997	Minimum Number of Operations to Make Array XOR Equal to K	Medium		solution	java, py
3000	Maximum Area of Longest Diagonal Rectangle	Easy		solution	py
3006	Find Beautiful Indices in the Given Array I	Medium		solution	py
3016	Minimum Number of Pushes to Type Word II	Medium	Daily	solution	py
3021	Alice and Bob Playing Flower Game	Medium		solution	go, py
3025	Find the Number of Ways to Place People I	Medium		solution	py
3027	Find the Number of Ways to Place People II	Hard		solution	py
3043	Find the Length of the Longest Common Prefix	Medium		solution	py
3045	Count Prefix and Suffix Pairs II	Hard		solution	py
3064	Guess the Number Using Bitwise Questions I	Medium		solution	c, py
3066	Minimum Operations to Exceed Threshold Value II	Medium		solution	py
3074	Apple Redistribution into Boxes	Easy		solution	py
3105	Longest Strictly Increasing or Strictly Decreasing Subarray	Easy		solution	py
3106	Lexicographically Smallest String After Operations With Constraint	Medium		solution	py
3110	Score of a String	Easy	Daily	solution	java, py
3111	Minimum Rectangles to Cover Points	Medium		solution	java, py
3136	Valid Word	Easy		solution	c, py
3147	Taking Maximum Energy From the Mystic Dungeon	Medium		solution	py
3151	Special Array I	Easy		solution	py
3157	Find the Level of Tree with Minimum Sum	Medium		solution	py
3160	Find the Number of Distinct Colors Among the Balls	Medium		solution	py
3163	String Compression III	Medium		solution	py
3168	Weekly Contest 400 - q1 - Minimum Number of Chairs in a Waiting Room	Easy	Contest	solution	py
3169	Weekly Contest 400 - q2 - Count Days Without Meetings	Medium	Contest	solution	py
3174	Biweekly Contest 132 - q1 - Clear Digits	Easy	Contest	solution	py
3175	Biweekly Contest 132 - q2 - Find The First Player to win K Games in a Row	Medium	Contest	solution	py
3178	Weekly Contest 401 - q1 - Find the Child Who Has the Ball After K Seconds	Easy	Contest	solution	py
3179	Weekly Contest 401 - q2 - Find the N-th Value After K Seconds	Medium	Contest	solution	py
3180	Weekly Contest 401 - q3 - Maximum Total Reward Using Operations I	Medium	Contest	solution	c, py
3184	Weekly Contest 402 - q1 - Count Pairs That Form a Complete Day I	Easy	Contest	solution	py
3185	Weekly Contest 402 - q2 - Count Pairs That Form a Complete Day II	Medium	Contest	solution	py
3186	Weekly Contest 402 - q3 - Maximum Total Damage With Spell Casting	Medium	Contest	solution	py
3189	Minimum Moves to Get a Peaceful Board	Medium	Weekly Premium	solution	py
3190	Find Minimum Operations to Make All Elements Divisible by Three	Easy		solution	java
3191	Minimum Operations to Make Binary Array Elements Equal to One I	Medium		solution	java
3192	Minimum Operations to Make Binary Array Elements Equal to One II	Medium		solution	java
3194	Weekly Contest 403 - q1 - Minimum Average of Smallest and Largest Elements	Easy	Contest	solution	py
3195	Weekly Contest 403 - q2 - Find the Minimum Area to Cover All Ones I	Medium	Contest	solution	py
3196	Weekly Contest 403 - q3 - Maximize Total Cost of Alternating Subarrays	Medium	Contest	solution	py
3210	Weekly Contest 405 - q1 - Find the Encrypted String	Easy	Contest	solution	py
3211	Weekly Contest 405 - q2 - Generate Binary Strings Without Adjacent Zeros	Medium	Contest	solution	js, py
3212	Weekly Contest 405 - q3 - Count Submatrices With Equal Frequency of X and Y	Medium	Contest	solution	py
3213	Weekly Contest 405 - q4 - Construct String with Minimum Cost	Hard	Contest	solution	py
3217	Delete Nodes From Linked List Present in Array	Medium		solution	py
3226	Weekly Contest 407 - q1 - Number of Bit Changes to Make Two Integers Equal	Easy	Contest	solution	py
3227	Weekly Contest 407 - q2 - Vowels Game in a String	Medium	Contest	solution	py
3228	Weekly Contest 407 - q3 - Maximum Number of Operations to Move Ones to the End	Medium	Contest	solution	py
3229	Weekly Contest 407 - q4 - Minimum Operations to Make Array Equal to Target	Hard	Contest	solution	py
3232	Weekly Contest 408 - q1 - Find if Digit Game Can Be Won	Easy	Contest	solution	py
3233	Weekly Contest 408 - q2 - Find the Count of Numbers Which Are Not Special	Medium	Contest	solution	java, py
3238	Biweekly Contest 136 - q1 - Find the Number of Winning Players	Easy	Contest	solution	py
3239	Biweekly Contest 136 - q2 - Minimum Number of Flips to Make Binary Grid Palindromic I	Medium	Contest	solution	py
3240	Biweekly Contest 136 - q3 - Minimum Number of Flips to Make Binary Grid Palindromic II	Medium	Contest	solution	py
3242	Design Neighbor Sum Service	Easy		solution	py
3248	Snake in Matrix	Easy		solution	py
3249	Count the Number of Good Nodes	Medium		solution	py
3306	Count of Substrings Containing Every Vowel and K Consonants II	Medium		solution	py
3349	Adjacent Increasing Subarrays Detection I	Easy		solution	py
3350	Adjacent Increasing Subarrays Detection II	Medium		solution	py
3392	Count Subarrays of Length Three With a Condition	Easy		solution	py
3396	Minimum Number of Operations to Make Elements in Array Distinct	Easy		solution	py
3432	Count Partitions with Even Sum Difference	Easy		solution	py
3443	Maximum Manhattan Distance After K Changes	Medium		solution	py
3460	Longest Common Prefix After at Most One Removal	Medium		solution	py
3461	Check If Digits Are Equal in String After Operations I	Easy		solution	py
3463	Check If Digits Are Equal in String After Operations II	Hard		solution	py
3512	Minimum Operations to Make Array Sum Divisible by K	Easy		solution	py
3516	Find Closest Person	Easy		solution	go, py
3541	Find Most Frequent Vowel and Consonant	Easy		solution	py

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