Documenting my LeetCode journey one problem at a time.

Each solution link opens a readable page with every submitted implementation and variant.

#	Problem Statement	Difficulty	Solutions
1	Two Sum	Easy	C++
2	Add Two Numbers	Medium	C++
7	Reverse Integer	Medium	C++ Java
8	String to Integer atoi	Medium	C++
9	Palindrome Number	Easy	C++ — string C++ Java
11	Container with Most Water	Medium	C++ — alternative 1 C++ — alternative 2 Java JavaScript
12	Integer to Roman	Medium	C++
13	Roman to Integer	Easy	C++
15	3sum	Medium	Java — hashmap Java — hashset Java
16	3sum Closest	Medium	C++
17	Letter Combinations of a Phone Number	Medium	C++
18	4sum	Medium	Java
19	Remove Nth Node from End of List	Medium	C++ Java
20	Valid Parentheses	Easy	Java
21	Merge Two Sorted Lists	Easy	C++ — alternative 1 C++ — alternative 2
22	Generate Parentheses	Medium	Java — backtrack Java
23	Merge K Sorted Lists	Hard	C++
24	Swap Nodes in Pairs	Medium	C++
25	Reverse Nodes in K Group	Hard	Java
26	Remove Duplicates from Sorted Array	Easy	C++ — alternative 1 C++ — alternative 2 Java
28	Find the Index of the First Occurrence in a String	Medium	C++
30	Substring with Concatenation of All Words	Hard	C++
31	Next Permutation	Medium	Java
32	Longest Valid Parentheses	Hard	C++
33	Search in Rotated Sorted Array	Medium	C++ Java
34	Find First and Last Position of Element in Sorted Array	Medium	Java
35	Search Insert Position	Easy	C++ Java
36	Valid Sudoku	Medium	C++ Java
37	Sudoku Solver	Hard	Java
38	Count and Say	Medium	C++ Java
39	Combination Sum	Medium	Java — backtrack preemptive Java — backtrack Java
40	Combination Sum II	Medium	Java
42	Trapping Rain Water	Hard	C++
47	Permutations II	Medium	Java
48	Rotate Image	Medium	C++ Java
49	Group Anagrams	Medium	C++
50	Powx N	Medium	Java
53	Maximum Subarray	Medium	Java
54	Spiral Matrix	Medium	Java
56	Merge Intervals	Medium	C++ Java
61	Rotate List	Medium	Java
62	Unique Paths	Medium	C++
64	Minimum Path Sum	Medium	Java — bottomUp Java — topDown Java
67	Add Binary	Easy	C++
68	Text Justification	Hard	C++
69	Sqrtx	Easy	C++
70	Climbing Stairs	Easy	C++ Java — dp memo Java — dp optimized Java — dp tab Java — iterative memo Java — recursive memo Java
72	Edit Distance	Hard	C++
73	Set Matrix Zeroes	Medium	Java — hashsets of indices Java
74	Search a 2d Matrix	Medium	C++ Java
75	Sort Colors	Medium	C++ Java
76	Minimum Window Substring	Hard	C++ — alternative 1 C++ — alternative 2
77	Combinations	Medium	C++
78	Subsets	Medium	C++
79	Word Search	Medium	C++ Java — dfs+backtracking Java
80	Remove Duplicates from Sorted Array II	Medium	C++
81	Search in Rotated Sorted Array II	Medium	Java
84	Largest Rectangle in Histogram	Hard	C++
88	Merge Sorted Array	Easy	Java
90	Subsets II	Medium	Java
91	Decode Ways	Medium	C++
94	Binary Tree Inorder Traversal	Easy	C++ Java
95	Unique Binary Search Trees II	Medium	C++
97	Interleaving String	Medium	C++
98	Validate Binary Search Tree	Medium	C++
99	Recover Binary Search Tree	Medium	C++
100	Same Tree	Easy	C++
102	Binary Tree Level Order Traversal	Medium	Java
103	Binary Tree Zigzag Level Order Traversal	Medium	C++
104	Maximum Depth of Binary Tree	Easy	C++ Java
108	Convert Sorted Array to Binary Search Tree	Easy	C++
109	Convert Sorted List to Binary Search Tree	Medium	C++
110	Balanced Binary Tree	Easy	Java
111	Minimum Depth of Binary Tree	Easy	C++
112	Path Sum	Easy	C++
113	Path Sum II	Medium	C++
116	Populating Next Right Pointers in Each Node	Medium	C++
118	Pascals Triangle	Easy	Java
119	Pascals Triangle II	Easy	Java
120	Triangle	Medium	Java — bottomUp Java
121	Best Time to Buy and Sell Stock	Easy	C++ — alternative 1 C++ — alternative 2 Java — kadane's algorithm Java — monotonic stack Java
125	Valid Palindrome	Easy	C++ — alternative 1 C++ — alternative 2 Java — recursion
126	Word Ladder II	Hard	C++
128	Longest Consecutive Sequence	Medium	Java — sorting Java — union find Java
131	Palindrome Partitioning	Medium	C++
134	Gas Station	Medium	C++ — alternative 1 C++ — alternative 2
135	Candy	Hard	Java — 2 pass Java
136	Single Number	Easy	C++ — alternative 1 C++ — alternative 2 Java
137	Single Number II	Medium	C++
138	Copy List with Random Pointer	Medium	Java
139	Word Break	Medium	C++
141	Linked List Cycle	Easy	C++ Java JavaScript
142	Linked List Cycle II	Medium	C++ — alternative 1 C++ — alternative 2 Java
143	Reorder List	Medium	C++
144	Binary Tree Preorder Traversal	Easy	C++ Java
145	Binary Tree Postorder Traversal	Easy	Java
147	Insertion Sort List	Medium	C++
148	Sort List	Medium	Java
149	Max Points on a Line	Hard	C++
150	Evaluate Reverse Polish Notation	Medium	C++
151	Reverse Words in a String	Medium	C++
152	Maximum Product Subarray	Medium	Java
153	Find Minimum in Rotated Sorted Array	Medium	Java
154	Find Minimum in Rotated Sorted Array II	Hard	Java
155	Min Stack	Medium	Java — AbstractMap.SimpleEntry Java — pair Java
160	Intersection of Two Linked Lists	Easy	C++ Java
162	Find Peak Element	Medium	Java
165	Compare Version Numbers	Medium	Java
166	Fraction to Recurring Decimal	Medium	Java
169	Majority Element	Easy	Java
173	Binary Search Tree Iterator	Medium	—
175	Combine Two Tables	Easy	—
179	Largest Number	Medium	Java
188	Best Time to Buy and Sell Stock IV	Hard	C++
189	Rotate Array	Medium	C++ Java — extra storage Java — inplace reversal Java
198	House Robber	Medium	Java — iterative memo Java — recursive memo Java
200	Number of Islands	Medium	C++ — alternative 1 C++ — alternative 2 Java
203	Remove Linked List Elements	Easy	C++
206	Reverse Linked List	Easy	Java
209	Minimum Size Subarray Sum	Medium	C++
210	Course Schedule II	Medium	C++
212	Word Search II	Hard	C++
214	Shortest Palindrome	Hard	Java
216	Combination Sum III	Medium	Java
218	The Skyline Problem	Hard	C++
219	Contains Duplicate II	Easy	C++ — alternative 1 C++ — alternative 2 JavaScript
221	Maximal Square	Medium	C++
222	Count Complete Tree Nodes	Medium	C++
223	Rectangle Area	Medium	C++
224	Basic Calculator	Hard	C++
225	Implement Stack Using Queues	Easy	Java
226	Invert Binary Tree	Easy	C++
227	Basic Calculator II	Medium	C++
229	Majority Element II	Medium	Java — hashmap Java
230	Kth Smallest Element in a BST	Medium	C++
231	Power of Two	Easy	Java — bit manipulation Java — parity Java
232	Implement Queue Using Stacks	Easy	Java
234	Palindrome Linked List	Easy	C++ Java
235	Lowest Common Ancestor of a Binary Search Tree	Easy	C++
236	Lowest Common Ancestor of a Binary Tree	Medium	C++
237	Delete Node in a Linked List	Medium	C++ — alternative 1 C++ — alternative 2 Java — linear Java Java — constant
238	Product of Array Except Self	Medium	Java
239	Sliding Window Maximum	Hard	C++
240	Search a 2d Matrix II	Medium	Java
241	Different Ways to Add Parentheses	Medium	Java
242	Valid Anagram	Easy	C++ JavaScript
258	Add Digits	Easy	C++ — alternative 1 C++ — alternative 2
260	Single Number III	Medium	Java
263	Ugly Number	Easy	C++
264	Ugly Number II	Medium	Java — minheap Java
273	Integer to English Words	Hard	Java
278	First Bad Version	Easy	C++ — alternative 1 C++ — alternative 2
279	Perfect Squares	Medium	C++ Java Java — bottomUp
283	Move Zeroes	Easy	Java
287	Find the Duplicate Number	Medium	—
290	Word Pattern	Easy	C++ JavaScript
295	Find Median from Data Stream	Hard	C++
300	Longest Increasing Subsequence	Medium	C++
307	Range Sum Query Mutable	Medium	C++
309	Best Time to Buy and Sell Stock with Cooldown	Medium	C++
310	Minimum Height Trees	Medium	C++
312	Burst Balloons	Hard	C++
319	Bulb Switcher	Medium	C++
322	Coin Change	Medium	Java — bottomUp Java
326	Power of Three	Easy	C++ Java — log Java
328	Odd Even Linked List	Medium	Java
329	Longest Increasing Path in a Matrix	Hard	Java
330	Patching Array	Hard	Java
334	Increasing Triplet Subsequence	Medium	C++
336	Palindrome Pairs	Hard	C++
338	Counting Bits	Easy	Java
342	Power of Four	Easy	C++ Java — math Java
344	Reverse String	Easy	C++ — alternative 1 C++ — alternative 2 Java
345	Reverse Vowels of a String	Easy	C++
349	Intersection of Two Arrays	Easy	C++
350	Intersection of Two Arrays II	Easy	Java — 2ptr Java
363	Max Sum of Rectangle No Larger Than K	Hard	C++
368	Largest Divisible Subset	Medium	C++
373	Find K Pairs with Smallest Sums	Medium	C++
374	Guess Number Higher or Lower	Easy	C++
377	Combination Sum IV	Medium	C++
378	Kth Smallest Element in a Sorted Matrix	Medium	C++
380	Insert Delete Getrandom O1	Medium	C++
382	Linked List Random Node	Medium	C++
383	Ransom Note	Easy	C++
386	Lexicographical Numbers	Medium	Java — dfs Java — string Java
387	First Unique Character in a String	Easy	C++
389	Find the Difference	Easy	C++
392	Is Subsequence	Easy	C++
393	UTF 8 Validation	Medium	C++
394	Decode String	Medium	C++
399	Evaluate Division	Medium	Java
402	Remove K Digits	Medium	C++
409	Longest Palindrome	Easy	Java
416	Partition Equal Subset Sum	Medium	Java
427	Construct Quad Tree	Medium	C++
429	N Ary Tree Level Order Traversal	Medium	C++
432	All Oone Data Structure	Hard	Java
433	Minimum Genetic Mutation	Medium	C++
438	Find All Anagrams in a String	Medium	C++
440	K Th Smallest in Lexicographical Order	Hard	Java
441	Arranging Coins	Easy	C++
443	String Compression	Medium	C++
446	Arithmetic Slices II Subsequence	—	C++
451	Sort Characters by Frequency	Medium	C++
452	Minimum Number of Arrows to Burst Balloons	Medium	C++ — alternative 1 C++ — alternative 2
458	Poor Pigs	Hard	C++
472	Concatenated Words	Hard	C++
476	Number Complement	Easy	C++ Java
485	Max Consecutive Ones	Easy	Java
486	Predict the Winner	Medium	C++
494	Target Sum	Medium	Java — brute force Java — DP memo2D Java
502	Ipo	Hard	C++ Java
509	Fibonacci Number	Easy	Java — iterative Java — recursion memoization Java — recursion Java
515	Find Largest Value in Each Tree Row	Medium	Java — bfs Java — dfs Java
518	Coin Change II	Medium	Java
520	Detect Capital	Easy	C++ — alternative 1 C++ — alternative 2
523	Continuous Subarray Sum	Medium	C++
525	Contiguous Array	Medium	C++
532	K Diff Pairs in an Array	Medium	C++
535	Encode and Decode Tinyurl	Medium	JavaScript
539	Minimum Time Difference	Medium	Java
540	Single Element in a Sorted Array	Medium	C++ Java
543	Diameter of Binary Tree	Easy	Java
547	Number of Provinces	Medium	Java
557	Reverse Words in a String III	Easy	C++
560	Subarray Sum Equals K	Medium	C++ — alternative 1 C++ — alternative 2 Java
564	Find the Closest Palindrome	Hard	Java
567	Permutation in String	Medium	Java — brute force Java
587	Erect the Fence	Hard	C++
590	N Ary Tree Postorder Traversal	Easy	Java
592	Fraction Addition and Subtraction	Medium	Java
594	Longest Harmonious Subsequence	Easy	Java — hashmap Java — sorting Java
605	Can Place Flowers	Easy	C++
606	Construct String from Binary Tree	Easy	C++
609	Find Duplicate File in System	Medium	C++ JavaScript
611	Valid Triangle Number	Medium	Java — binary search Java — brute force Java
622	Design Circular Queue	Medium	C++ Java
623	Add One Row to Tree	Medium	C++
624	Maximum Distance in Arrays	Medium	Java
628	Maximum Product of Three Numbers	Easy	Java
632	Smallest Range Covering Elements from K Lists	Hard	Java
633	Sum of Square Numbers	Medium	Java
637	Average of Levels in Binary Tree	Easy	C++
641	Design Circular Deque	Medium	Java
643	Maximum Average Subarray I	Easy	C++ JavaScript
645	Set Mismatch	Easy	C++
648	Replace Words	Medium	Java
650	2 Keys Keyboard	Medium	Java — bottomUp Java
652	Find Duplicate Subtrees	Medium	C++
653	Two Sum IV Input Is a BST	Easy	C++
657	Robot Return to Origin	Easy	Java
658	Find K Closest Elements	Medium	C++
659	Split Array into Consecutive Subsequences	Medium	C++
664	Strange Printer	Hard	C++ Java
670	Maximum Swap	Medium	Java
684	Redundant Connection	Medium	Java
689	Maximum Sum of 3 Non Overlapping Subarrays	Hard	Java
692	Top K Frequent Words	Medium	C++
701	Insert into a Binary Search Tree	Medium	C++
703	Kth Largest Element in a Stream	Easy	Java — bst Java — sort Java
704	Binary Search	Easy	C++ Java
705	Design Hashset	Easy	C++
712	Minimum ASCII Delete Sum for Two Strings	Medium	C++
718	Maximum Length of Repeated Subarray	Medium	C++
719	Find K Th Smallest Pair Distance	Hard	Java
725	Split Linked List in Parts	Medium	Java
726	Number of Atoms	Hard	Java
729	My Calendar I	Medium	Java
731	My Calendar II	Medium	Java
732	My Calendar III	Hard	—
739	Daily Temperatures	Medium	C++
743	Network Delay Time	Medium	Java
746	Min Cost Climbing Stairs	Easy	Java — bottomUp Java — dfs Java
762	Prime Number of Set Bits in Binary Representation	Easy	Java — naive Java
763	Partition Labels	Medium	C++ Java
766	Toeplitz Matrix	Easy	C++
769	Max Chunks to Make Sorted	Medium	Java — visited nums Java
771	Jewels and Stones	Easy	C++ — alternative 1 C++ — alternative 2
773	Sliding Puzzle	Hard	Java
781	Rabbits in Forest	Medium	Java
783	Minimum Distance Between BST Nodes	Easy	C++
787	Cheapest Flights Within K Stops	Medium	—
790	Domino and Tromino Tiling	Medium	C++ Java
796	Rotate String	Easy	Java
797	All Paths from Source to Target	Medium	C++
802	K Th Smallest Prime Fraction	Medium	Java — alternative 1 Java — alternative 2
804	Unique Morse Code Words	Easy	C++
808	Soup Servings	Medium	Java — dp topDown Java
814	Binary Tree Pruning	Medium	C++
826	Most Profit Assigning Work	Medium	Java
827	Making a Large Island	Hard	Java
834	Sum of Distances in Tree	Hard	C++
835	Image Overlap	Medium	Java
836	Rectangle Overlap	Easy	Java
837	New 21 Game	Medium	Java
838	Push Dominoes	Medium	C++ Java
840	Magic Squares in Grid	Medium	Java
841	Keys and Rooms	Medium	C++ — alternative 1 C++ — alternative 2
846	Hand of Straights	Medium	Java — map Java
851	Loud and Rich	Medium	Java — topological_sort Java
858	Mirror Reflection	Medium	C++
860	Lemonade Change	Easy	Java
862	Shortest Subarray with Sum at Least K	Hard	Java
869	Reordered Power of 2	Medium	C++ Java
871	Minimum Number of Refueling Stops	Hard	C++
873	Length of Longest Fibonacci Subsequence	Medium	Java — brute force Java
874	Walking Robot Simulation	Medium	Java
875	Koko Eating Bananas	Medium	C++ — alternative 1 C++ — alternative 2 Java
876	Middle of the Linked List	Easy	C++ — alternative 1 C++ — (2) C++ — alternative 2 Java
879	Profitable Schemes	Hard	C++
884	Uncommon Words from Two Sentences	Easy	Java
885	Spiral Matrix III	Medium	Java
886	Possible Bipartition	Medium	C++
890	Find and Replace Pattern	Medium	C++
893	All Nodes Distance K in Binary Tree	Medium	C++
895	Maximum Frequency Stack	Hard	Java
897	Increasing Order Search Tree	Easy	C++
899	Orderly Queue	Hard	C++
901	Online Stock Span	Medium	C++
902	Numbers at Most N Given Digit Set	Hard	C++
904	Fruit into Baskets	Medium	C++ — alternative 1 C++ — alternative 2 Java
907	Sum of Subarray Minimums	Medium	C++
908	Middle of the Linked List	Easy	C++
909	Snakes and Ladders	Medium	C++ Java
912	Sort an Array	Medium	C++
916	Word Subsets	Medium	C++ Java
918	Maximum Sum Circular Subarray	Medium	—
921	Minimum Add to Make Parentheses Valid	Medium	Java
922	Sort Array by Parity II	Easy	C++
931	Minimum Falling Path Sum	Medium	Java
936	Stamping the Sequence	Hard	Java
941	Valid Mountain Array	Easy	C++
944	Delete Columns to Make Sorted	Easy	C++ Java
945	Minimum Increment to Make Array Unique	Medium	Java
947	Most Stones Removed with Same Row or Column	Medium	C++ Java
948	Bag of Tokens	Medium	C++
951	Flip Equivalent Binary Trees	Medium	Java
956	Number of Music Playlists	Hard	C++
958	Sort Array by Parity II	Easy	C++
959	Regions Cut by Slashes	Medium	Java
961	N Repeated Element in Size 2n Array	Easy	Java
962	Maximum Width Ramp	Medium	Java
966	Vowel Spellchecker	Medium	Java — regex Java — streams Java
967	Numbers with Same Consecutive Differences	Medium	C++
973	K Closest Points to Origin	Medium	C++
974	Subarray Sums Divisible by K	Medium	C++ Java
976	Largest Perimeter Triangle	Easy	C++ Java
980	Unique Paths III	Hard	C++
981	Time Based Key Value Store	Medium	C++
983	Minimum Cost for Tickets	Medium	Java — topDown Java
985	Sum of Even Numbers After Queries	Medium	C++
987	Vertical Order Traversal of a Binary Tree	Hard	C++
989	Add to Array Form of Integer	Easy	C++
990	Satisfiability of Equality Equations	Medium	C++
994	Rotting Oranges	Medium	Java
995	Minimum Number of K Consecutive Bit Flips	Hard	Java
997	Find the Town Judge	Easy	C++ — alternative 1 C++ — alternative 2
1002	Find Common Characters	Easy	Java
1004	Max Consecutive Ones III	Medium	C++
1007	Minimum Domino Rotations for Equal Row	Medium	Java — simulation Java
1009	Complement of Base 10 Integer	Easy	C++
1010	Pairs of Songs with Total Durations Divisible by 60	Medium	C++
1011	Capacity to Ship Packages Within D Days	Medium	—
1014	Best Sightseeing Pair	Medium	Java
1015	Smallest Integer Divisible by K	Medium	C++ Java
1022	Sum of Root to Leaf Binary Numbers	Easy	C++
1026	Maximum Difference Between Node and Ancestor	Medium	C++
1028	Recover a Tree from Preorder Traversal	Hard	Java
1038	Binary Search Tree to Greater Sum Tree	Medium	Java
1041	Robot Bounded in Circle	Medium	C++
1047	Remove All Adjacent Duplicates in String	Easy	C++
1051	Height Checker	Easy	Java
1052	Grumpy Bookstore Owner	Medium	Java — prefixSum Java
1061	Lexicographically Smallest Equivalent String	Medium	Java
1071	Greatest Common Divisor of Strings	—	C++
1072	Flip Columns for Maximum Number of Equal Rows	Medium	Java
1079	Letter Tile Possibilities	Medium	Java
1092	Shortest Common Supersequence	Hard	Java
1094	Car Pooling	Medium	C++
1105	Filling Bookcase Shelves	Medium	Java
1106	Parsing a Boolean Expression	Hard	Java
1110	Delete Nodes and Return Forest	Medium	Java
1123	Lowest Common Ancestor of Deepest Leaves	Medium	Java
1128	Number of Equivalent Domino Pairs	Easy	Java
1129	Shortest Path with Alternating Colors	Medium	C++
1137	N Th Tribonacci Number	Easy	C++
1140	Stone Game II	Medium	Java
1155	Number of Dice Rolls with Target Sum	Medium	C++
1162	As Far from Land as Possible	—	C++
1189	Maximum Number of Balloons	Easy	Java
1190	Reverse Substrings Between Each Pair of Parentheses	Medium	Java
1200	Minimum Absolute Difference	Easy	C++
1202	Smallest String with Swaps	Medium	Java
1207	Unique Number of Occurrences	Easy	C++
1208	Get Equal Substrings Within Budget	Medium	Java
1233	Remove Sub Folders from the Filesystem	Medium	Java — 2pass trie Java — sort lexico regex Java — sort+trie Java
1235	Maximum Profit in Job Scheduling	Hard	C++
1239	Maximum Length of a Concatenated String with Unique Characters	Medium	C++
1248	Count Number of Nice Subarrays	Medium	Java
1261	Find Elements in a Contaminated Binary Tree	Medium	Java
1267	Count Servers That Communicate	Medium	Java
1277	Count Square Submatrices with All Ones	Medium	Java
1290	Convert Binary Number in a Linked List to Integer	Easy	Java
1291	Sequential Digits	Medium	C++
1293	Shortest Path in a Grid with Obstacles Elimination	Hard	C++
1295	Find Numbers with Even Number of Digits	Easy	Java
1298	Maximum Candies You Can Get from Boxes	Hard	Java
1304	Longest Happy String	Medium	Java — alternative 1 Java — alternative 2
1305	All Elements in Two Binary Search Trees	Medium	C++
1306	Jump Game III	Medium	Java
1310	Xor Queries of a Subarray	Medium	Java
1312	Minimum Insertion Steps to Make a String Palindrome	Hard	C++
1317	Convert Integer to the Sum of Two No Zero Integers	Easy	Java
1323	Maximum 69 Number	Easy	C++ Java — string Java
1328	Break a Palindrome	Medium	JavaScript
1329	Sort the Matrix Diagonally	Medium	C++ C++ — Approach1_1329 sort the matrix diagonally
1331	Rank Transform of an Array	Easy	Java
1334	Find the City with the Smallest Number of Neighbors at a Threshold Distance	Medium	Java
1335	Minimum Difficulty of a Job Schedule	Hard	C++
1338	Reduce Array Size to the Half	Medium	C++
1344	Angle Between Hands of a Clock	Medium	Java
1345	Jump Game IV	Hard	C++ Java — bfs Java — bidirectional bfs Java
1346	Check If N and Its Double Exist	Easy	Java
1352	Product of the Last K Numbers	Medium	Java
1353	Maximum Number of Events That Can Be Attended	Medium	Java
1358	Number of Substrings Containing All Three Characters	Medium	Java — sliding window Java
1365	How Many Numbers Are Smaller Than the Current Number	Easy	C++
1367	Linked List in Binary Tree	Medium	Java
1371	Find the Longest Substring Containing Vowels in Even Counts	Medium	Java — brute force Java — sliding window TLE Java
1380	Lucky Numbers in a Matrix	Easy	Java
1381	Design a Stack with Increment Operation	Medium	Java
1382	Balance a Binary Search Tree	Medium	Java
1390	Four Divisors	Medium	Java — set Java
1394	Find Lucky Integer in an Array	Easy	Java
1395	Count Number of Teams	Medium	Java
1396	Design Underground System	Medium	—
1399	Count Largest Group	Easy	Java
1400	Construct K Palindrome Strings	Medium	Java — parity counter Java
1401	Circle and Rectangle Overlapping	Medium	Java
1404	Number of Steps to Reduce a Number in Binary Representation to One	Medium	Java
1405	Longest Happy String	Medium	Java
1408	String Matching in an Array	Easy	Java
1415	The K Th Lexicographical String of All Happy Strings of Length N	Medium	Java
1416	Restore the Array	Hard	C++
1418	Fair Distribution of Cookies	Medium	C++
1422	Maximum Score After Splitting a String	Easy	Java — 1 pass Java — 1 ptr Java — 2 pass Java
1432	Max Difference You Can Get from Changing an Integer	Medium	Java
1438	Longest Continuous Subarray with Absolute Diff Less Than or Equal to Limit	Medium	Java
1443	Minimum Time to Collect All Apples in a Tree	Medium	C++
1448	Count Good Nodes in Binary Tree	Medium	C++
1455	Check If a Word Occurs as a Prefix of Any Word in a Sentence	Easy	Java
1457	Pseudo Palindromic Paths in a Binary Tree	Medium	C++
1460	Make Two Arrays Equal by Reversing Subarrays	Easy	Java — map Java — sort Java
1462	Course Schedule IV	Medium	Java
1463	Cherry Pickup II	Hard	C++
1464	Maximum Product of Two Elements in an Array	Easy	Java
1475	Final Prices with a Special Discount in a Shop	Easy	Java
1477	Find Two Non Overlapping Sub Arrays Each with Target Sum	Medium	Java
1482	Minimum Number of Days to Make M Bouquets	Medium	C++ Java
1488	Avoid Flood in the City	Medium	Java — brute force Java
1493	Longest Subarray of 1s After Deleting One Element	Medium	Java
1497	Check If Array Pairs Are Divisible by K	Medium	Java
1498	Number of Subsequences That Satisfy the Given Sum Condition	Medium	Java — binarySearch multiple Java
1504	Count Submatrices with All Ones	Medium	Java
1508	Range Sum of Sorted Subarray Sums	Medium	Java
1509	Minimum Difference Between Largest and Smallest Value in Three Moves	Medium	Java
1510	Stone Game IV	Hard	C++
1514	Path with Maximum Probability	Medium	C++ Java
1518	Water Bottles	Easy	Java
1519	Number of Nodes in the Sub Tree with the Same Label	Medium	C++
1523	Count Odd Numbers in an Interval Range	Easy	—
1524	Number of Sub Arrays with Odd Sum	Medium	Java
1530	Number of Good Leaf Nodes Pairs	Medium	Java
1531	String Compression II	Hard	C++
1534	Count Good Triplets	Easy	Java
1544	Make the String Great	Easy	C++
1545	Find Kth Bit in Nth Binary String	Medium	Java
1550	Three Consecutive Odds	Easy	Java
1552	Magnetic Force Between Two Balls	Medium	Java
1568	Minimum Number of Days to Disconnect Island	Hard	Java
1574	Shortest Subarray to Be Removed to Make Array Sorted	Medium	Java
1578	Minimum Time to Make Rope Colorful	Medium	C++ JavaScript
1579	Remove Max Number of Edges to Keep Graph Fully Traversable	Hard	Java
1584	Min Cost to Connect All Points	Medium	C++
1586	Longest Subarray of 1s After Deleting One Element	Medium	C++
1590	Make Sum Divisible by P	Medium	Java
1593	Split a String into the Max Number of Unique Substrings	Medium	Java — backtrack prune Java — backtrack Java
1598	Crawler Log Folder	Easy	Java
1605	Minimum Number of Days to Make M Bouquets	Medium	Java — alternative 1 Java — alternative 2
1608	Special Array with X Elements Greater Than or Equal X	Easy	Java — nlogn Java
1627	Last Moment Before All Ants Fall Out of a Plank	Medium	C++
1636	Sort Array by Increasing Frequency	Easy	Java
1639	Number of Ways to Form a Target String Given a Dictionary	Hard	C++ Java
1652	Defuse the Bomb	Easy	Java
1653	Minimum Deletions to Make String Balanced	Medium	Java — dp Java — prefix_suffix Java
1657	Determine If Two Strings Are Close	Medium	C++
1658	Minimum Operations to Reduce X to Zero	Medium	Java
1662	Check If Two String Arrays Are Equivalent	Easy	C++
1671	Minimum Number of Removals to Make Mountain Array	Hard	Java
1672	Richest Customer Wealth	Easy	C++
1680	Concatenation of Consecutive Binary Numbers	Medium	C++
1684	Count the Number of Consistent Strings	Easy	Java
1701	Average Waiting Time	Medium	Java
1704	Determine If String Halves Are Alike	Easy	C++
1706	Where Will the Ball Fall	Medium	C++ — alternative 1 C++ — alternative 2
1711	Find Valid Matrix Given Row and Column Sums	Medium	Java
1716	Calculate Money in Leetcode Bank	Easy	Java
1717	Maximum Score from Removing Substrings	Medium	Java
1718	Construct the Lexicographically Largest Valid Sequence	Medium	Java
1723	Maximum Number of Achievable Transfer Requests	Hard	C++
1726	Tuple with Same Product	Medium	Java
1732	Find the Highest Altitude	Easy	Java
1733	Minimum Number of People to Teach	Medium	Java
1749	Maximum Absolute Sum of Any Subarray	Medium	Java
1752	Check If Array Is Sorted and Rotated	Easy	Java
1760	Minimum Limit of Balls in a Bag	Medium	Java
1765	Map of Highest Peak	Medium	Java — bfs floodFill Java
1769	Minimum Number of Operations to Move All Balls to Each Box	Medium	Java
1770	Minimum Deletions to Make Character Frequencies Unique	Medium	C++ — alternative 1 C++ — alternative 2
1776	Minimum Operations to Reduce X to Zero	Medium	C++ Java
1780	Check If Number Is a Sum of Powers of Three	Medium	Java — greedy Java
1790	Check If One String Swap Can Make Strings Equal	Easy	Java
1791	Find Center of Star Graph	Easy	Java — O(n) Java
1792	Maximum Average Pass Ratio	Medium	Java
1800	Maximum Ascending Subarray Sum	Easy	Java
1807	Evaluate the Bracket Pairs of a String	Medium	Java
1813	Sentence Similarity III	Medium	Java
1823	Find the Winner of the Circular Game	Medium	Java — simulate Java
1829	Maximum Xor for Each Query	Medium	Java
1832	Check If the Sentence Is Pangram	Easy	C++
1833	Maximum Ice Cream Bars	Medium	C++ Java
1834	Single Threaded CPU	Medium	C++
1838	Frequency of the Most Frequent Element	Medium	Java
1840	Maximum Building Height	Hard	Java
1846	Maximum Element After Decreasing and Rearranging	Medium	Java
1861	Rotating the Box	Medium	Java
1863	Sum of All Subset Xor Totals	Easy	Java
1865	Finding Pairs with a Certain Sum	Medium	Java
1894	Find the Student That Will Replace the Chalk	Medium	Java — prefix_sum+bin_search Java — prefix_sum+iterative Java
1905	Count Sub Islands	Medium	Java
1920	Build Array from Permutation	Easy	Java
1922	Count Good Numbers	Medium	Java
1926	Nearest Exit from Entrance in Maze	Medium	C++
1930	Unique Length 3 Palindromic Subsequences	Medium	Java
1935	Maximum Number of Words You Can Type	Easy	Java
1937	Maximum Number of Points with Cost	Medium	Java
1942	The Number of the Smallest Unoccupied Chair	Medium	Java
1945	Sum of Digits of String After Convert	Easy	Java
1957	Delete Characters to Make Fancy String	Easy	Java
1962	Remove Stones to Minimize the Total	Medium	C++
1963	Minimum Number of Swaps to Make the String Balanced	Medium	Java
1967	Number of Strings That Appear as Substrings in Word	Easy	Java
1971	Find If Path Exists in Graph	Easy	C++
1975	Maximum Matrix Sum	Medium	Java
1976	Number of Ways to Arrive at Destination	Medium	Java
1980	Find Unique Binary String	Medium	Java
1996	The Number of Weak Characters in the Game	Medium	C++
2000	Minimum Speed to Arrive on Time	Medium	C++
2007	Find Original Array from Doubled Array	Medium	C++
2011	Final Value of Variable After Performing Operations	Easy	Java
2016	Maximum Difference Between Increasing Elements	Easy	Java
2017	Grid Game	Medium	Java
2022	Convert 1d Array into 2d Array	Easy	Java
2028	Find Missing Observations	Medium	Java
2029	Stone Game Ix	Medium	Java
2033	Minimum Operations to Make a Uni Value Grid	Medium	Java
2037	Minimum Number of Moves to Seat Everyone	Easy	Java
2043	Simple Bank System	Medium	Java
2044	Count Number of Maximum Bitwise or Subsets	Medium	Java — bit manipulation Java — recursion memo Java — recursion Java
2045	Second Minimum Time to Reach Destination	Hard	Java
2048	Next Greater Numerically Balanced Number	Medium	Java
2053	Kth Distinct String in an Array	Easy	Java
2054	Two Best Non Overlapping Events	Medium	Java
2058	Find the Minimum and Maximum Number of Nodes Between Critical Points	Medium	Java
2064	Minimized Maximum of Products Distributed to Any Store	Medium	Java
2070	Most Beautiful Item for Each Query	Medium	Java
2091	Removing Minimum and Maximum from Array	Medium	Java
2094	Finding 3 Digit Even Numbers	Easy	Java
2095	Delete the Middle Node of a Linked List	Medium	C++ Java
2096	Step by Step Directions from a Binary Tree Node to Another	Medium	Java
2097	Valid Arrangement of Pairs	Hard	Java
2099	Find Subsequence of Length K with the Largest Sum	Easy	Java — 2 heaps Java — sort twice Java
2101	Last Day Where You Can Still Cross	Hard	C++ Java
2106	Maximum Fruits Harvested After at Most K Steps	Hard	Java
2109	Adding Spaces to a String	Medium	Java — stringBuilder Java
2115	Find All Possible Recipes from Given Supplies	Medium	Java
2116	Check If a Parentheses String Can Be Valid	Medium	Java
2125	Number of Laser Beams in a Bank	Medium	Java
2126	Destroying Asteroids	Medium	Java
2130	Maximum Twin Sum of a Linked List	Medium	Java
2131	Longest Palindrome by Concatenating Two Letter Words	Medium	C++ Java — hashmap Java
2134	Minimum Swaps to Group All 1s Together II	Medium	C++ Java
2136	Earliest Possible Day of Full Bloom	—	C++
2138	Divide a String into Groups of Size K	Easy	Java
2140	Solving Questions with Brainpower	Medium	Java — DP top down Java
2144	Minimum Cost of Buying Candies with Discount	Easy	Java
2145	Count the Hidden Sequences	Medium	Java
2149	Rearrange Array Elements by Sign	Medium	Java
2161	Partition Array According to Given Pivot	Medium	Java — store in array Java
2176	Count Equal and Divisible Pairs in an Array	Easy	Java — naive Java Java — hashmap
2179	Count Good Triplets in an Array	Hard	Java
2181	Merge Nodes in Between Zeros	Medium	Java
2182	Construct String with Repeat Limit	Medium	Java
2185	Counting Words with a Given Prefix	Easy	Java — 1 liner stream lambda Java
2191	Sort the Jumbled Numbers	Medium	Java
2192	All Ancestors of a Node in a Directed Acyclic Graph	Medium	Java
2196	Create Binary Tree from Descriptions	Medium	Java
2200	Find All K Distant Indices in an Array	Easy	Java
2206	Divide Array into Equal Pairs	Easy	Java — hashset Java
2210	Count Hills and Valleys in an Array	Easy	Java
2211	Count Collisions on a Road	Medium	Java
2220	Minimum Bit Flips to Convert Number	Easy	Java — bit masking Java — bit shifting Java
2221	Find Triangular Sum of an Array	Medium	Java — simulation inPlace Java
2225	Find Players with Zero or One Losses	Medium	C++
2226	Maximum Candies Allocated to K Children	Medium	Java
2244	Minimum Rounds to Complete All Tasks	Medium	C++
2246	Longest Path with Different Adjacent Characters	Hard	C++
2256	Minimum Average Difference	Medium	C++
2257	Count Unguarded Cells in the Grid	Medium	Java
2259	Remove Digit from Number to Maximize Result	Easy	C++ Java
2260	Minimum Consecutive Cards to Pick Up	Medium	C++ Java
2264	Largest 3 Same Digit Number in String	Easy	Java Java — naive
2265	Count Nodes Equal to Average of Subtree	Medium	Java
2270	Number of Ways to Split Array	Medium	Java — prefixSum_O_1_space Java — prefixSum O_n_space Java
2273	Find Resultant Array After Removing Anagrams	Easy	Java
2275	Largest Combination with Bitwise and Greater Than Zero	Medium	Java
2279	Maximum Bags with Full Capacity of Rocks	Medium	C++
2285	Maximum Total Importance of Roads	Medium	Java
2290	Minimum Obstacle Removal to Reach Corner	Hard	Java
2294	Partition Array Such That Maximum Difference Is K	Medium	Java
2302	Count Subarrays with Score Less Than K	Hard	Java
2306	Naming a Company	Hard	—
2311	Longest Binary Subsequence Less Than or Equal to K	Medium	Java
2326	Spiral Matrix IV	Medium	Java
2327	Number of People Aware of a Secret	Medium	Java
2336	Smallest Number in Infinite Set	Medium	C++
2337	Remove Digit from Number to Maximize Result	Easy	Java — alternative 1 Java — alternative 2
2338	Count the Number of Ideal Arrays	Hard	Java
2342	Max Sum of a Pair with Equal Sum of Digits	Medium	Java
2347	Count Nodes Equal to Average of Subtree	Medium	C++
2348	Number of Zero Filled Subarrays	Medium	C++ Java
2349	Design a Number Container System	Medium	Java — 2 maps 1 of meanHeaps with lazy update Java — 2 maps 1 of treesets Java
2353	Design a Food Rating System	Medium	Java
2359	Find Closest Node to Given Two Nodes	Medium	C++ Java
2360	Substring with Largest Variance	Hard	—
2364	Count Number of Bad Pairs	Medium	Java
2373	Largest Local Values in a Matrix	Easy	Java
2379	Minimum Recolors to Get K Consecutive Black Blocks	Easy	Java
2381	Shifting Letters II	Medium	Java
2389	Longest Subsequence with Limited Sum	Easy	—
2392	Build a Matrix with Conditions	Hard	Java — topological sort Java
2401	Longest Nice Subarray	Medium	Java — optimized sliding window Java
2402	Meeting Rooms III	Hard	Java
2406	Divide Intervals into Minimum Number of Groups	Medium	Java — line sweep ordered Java
2410	Maximum Matching of Players with Trainers	Medium	Java
2415	Reverse Odd Levels of Binary Tree	Medium	Java
2416	Sum of Prefix Scores of Strings	Hard	Java
2418	Sort the People	Easy	Java
2419	Longest Subarray with Maximum Bitwise And	Medium	Java
2421	Number of Good Paths	Hard	—
2425	Bitwise Xor of All Pairings	Medium	Java
2429	Minimize Xor	Medium	Java
2434	Using a Robot to Print the Lexicographically Smallest String	Medium	Java
2438	Range Product Queries of Powers	Medium	Java — brute force Java — prefix 2D Java
2444	Count Subarrays with Fixed Bounds	Hard	Java
2456	Most Popular Video Creator	Medium	C++ Java
2458	Height of Binary Tree After Subtree Removal Queries	Hard	Java — 2pass traversal Java
2460	Apply Operations to an Array	Easy	C++ Java
2461	Maximum Sum of Distinct Subarrays with Length K	Medium	C++ Java
2462	Total Cost to Hire K Workers	Medium	C++
2463	Minimum Total Distance Traveled	Hard	Java
2466	Count Ways to Build Good Strings	Medium	Java
2467	Most Profitable Path in a Tree	Medium	Java
2469	Convert the Temperature	Easy	C++
2470	Number of Subarrays with Lcm Equal to K	Medium	C++
2471	Minimum Number of Operations to Sort a Binary Tree by Level	Medium	C++ Java
2475	Number of Unequal Triplets in Array	Easy	C++
2476	Closest Nodes Queries in a Binary Search Tree	Medium	C++
2485	Find the Pivot Integer	Easy	C++
2486	Append Characters to String to Make Subsequence	Medium	Java
2490	Circular Sentence	Easy	Java
2491	Divide Players into Teams of Equal Skill	Medium	Java
2501	Longest Square Streak in an Array	Medium	Java
2503	Maximum Number of Points from Grid Queries	Hard	Java
2516	Take K of Each Character from Left and Right	Medium	Java
2519	Find the Original Array of Prefix Xor	Medium	C++
2520	Count the Digits That Divide a Number	Easy	—
2521	Distinct Prime Factors of Product of Array	Medium	C++
2522	Partition String into Substrings with Values at Most K	Medium	C++
2523	Closest Prime Numbers in Range	Medium	Java
2529	Maximum Count of Positive Integer and Negative Integer	Easy	Java — binary search Java — brute force Java
2530	Maximal Score After Applying K Operations	Medium	Java — max heap Java
2536	Increment Submatrices by One	Medium	—
2537	Count the Number of Good Subarrays	Medium	Java
2544	Alternating Digit Sum	Easy	C++
2545	Sort the Students by Their Kth Score	Medium	C++
2546	Apply Bitwise Operations to Make Strings Equal	Medium	C++
2551	Put Marbles in Bags	Hard	Java
2554	Maximum Number of Integers to Choose from a Range I	Medium	Java — sort Java
2558	Take Gifts from the Richest Pile	Easy	C++ Java
2559	Count Vowel Strings in Ranges	Medium	C++ Java
2560	House Robber IV	Medium	Java
2563	Count the Number of Fair Pairs	Medium	Java — binary search basic Java
2566	Maximum Difference by Remapping a Digit	Easy	Java
2570	Merge Two 2d Arrays by Summing Values	Easy	Java
2574	Left and Right Sum Differences	Easy	Java
2577	Minimum Time to Visit a Cell in a Grid	Hard	Java
2579	Count Total Number of Colored Cells	Medium	Java — agp series Java
2582	Pass the Pillow	Easy	Java
2583	Kth Largest Sum in a Binary Tree	Medium	Java — bfs+maxheap Java — bfs+minheap Java
2593	Find Score of an Array After Marking All Elements	Medium	Java
2594	Minimum Time to Repair Cars	Medium	Java — binary search Java
2598	Smallest Missing Non Negative Integer After Operations	Medium	Java
2601	Prime Subtraction Operation	Medium	Java
2616	Minimize the Maximum Difference of Pairs	Medium	Java
2641	Cousins in Binary Tree II	Medium	Java — 1pass BFS Java — 2pass BFS+DFS Java
2657	Find the Prefix Common Array of Two Arrays	Medium	Java
2658	Maximum Number of Fish in a Grid	Medium	Java
2661	First Completely Painted Row or Column	Medium	Java
2678	Number of Senior Citizens	Easy	Java — string Java
2681	Put Marbles in Bags	Hard	C++
2684	Maximum Number of Moves in a Grid	Medium	Java
2685	Count the Number of Complete Components	Medium	Java
2696	Minimum String Length After Removing Substrings	Easy	Java — stack Java
2698	Find the Punishment Number of an Integer	Medium	Java — cheating Java
2699	Modify Graph Edge Weights	Hard	Java
2707	Extra Characters in a String	Medium	Java
2749	Minimum Operations to Make the Integer Zero	Medium	Java
2751	Robot Collisions	Hard	Java
2762	Continuous Subarrays	Medium	Java
2770	Maximum Number of Jumps to Reach the Last Index	Medium	Java
2779	Maximum Beauty of an Array After Applying Operation	Medium	Java
2780	Minimum Index of a Valid Split	Medium	Java
2785	Sort Vowels in a String	Medium	Java
2787	Ways to Express an Integer as Sum of Powers	Medium	Java — dp bottomUp Java — dp topDown Java
2799	Count Complete Subarrays in an Array	Medium	Java
2807	Insert Greatest Common Divisors in Linked List	Medium	Java
2818	Apply Operations to Maximize Score	Hard	Java
2825	Make String a Subsequence Using Cyclic Increments	Medium	Java
2843	Count Symmetric Integers	Easy	Java — digit extraction — alternative 1 Java — string Java Java — digit extraction — alternative 2
2845	Count of Interesting Subarrays	Medium	Java
2873	Maximum Value of an Ordered Triplet I	Easy	Java
2874	Maximum Value of an Ordered Triplet II	Medium	Java — prefixSum Java
2894	Divisible and Non Divisible Sums Difference	Easy	Java — math Java — simulation Java
2900	Longest Unequal Adjacent Groups Subsequence I	Easy	Java
2904	Shortest and Lexicographically Smallest Beautiful String	Medium	Java — sliding window substring Java
2914	Minimum Number of Changes to Make Binary String Beautiful	Medium	Java
2918	Minimum Equal Sum of Two Arrays After Replacing Zeros	Medium	Java
2924	Find Champion II	Medium	Java
2929	Distribute Candies Among Children II	Medium	Java — enumeration Java — math Java
2938	Separate Black and White Balls	Medium	Java — 2 ptrs Java
2940	Find Building Where Alice and Bob Can Meet	Hard	Java
2942	Find Words Containing Character	Easy	Java
2948	Make Lexicographically Smallest Array by Swapping Elements	Medium	Java
2962	Count Subarrays Where Max Element Appears at Least K Times	Medium	Java
2965	Find Missing and Repeated Values	Easy	Java — frequency Java
2966	Divide Array into Arrays with Max Difference	Medium	Java
2976	Minimum Cost to Convert String I	Medium	Java — djikstra Java
2981	Find Longest Special Substring That Occurs Thrice I	Medium	Java
3000	Maximum Area of Longest Diagonal Rectangle	Easy	Java
3005	Count Elements with Maximum Frequency	Easy	Java
3011	Find If Array Can Be Sorted	Medium	Java
3014	Minimum Number of Pushes to Type Word I	Easy	Java — simulation Java
3016	Minimum Number of Pushes to Type Word II	Medium	Java
3020	Find the Maximum Number of Elements in Subset	Medium	Java
3024	Type of Triangle	Easy	Java
3025	Find the Number of Ways to Place People I	Medium	Java — simulation Java
3042	Count Prefix and Suffix Pairs I	Easy	Java
3043	Find the Length of the Longest Common Prefix	Medium	Java
3066	Minimum Operations to Exceed Threshold Value II	Medium	Java
3085	Minimum Deletions to Make String K Special	Medium	Java
3093	Longest Common Suffix Queries	Hard	Java
3097	Shortest Subarray with or at Least K II	Medium	Java
3100	Water Bottles II	Medium	Java
3105	Longest Strictly Increasing or Strictly Decreasing Subarray	Easy	Java
3108	Minimum Cost Walk in Weighted Graph	Hard	Java
3110	Score of a String	Easy	Java
3121	Count the Number of Special Characters II	Medium	Java
3133	Minimum Array End	Medium	—
3151	Special Array I	Easy	Java
3152	Special Array II	Medium	Java — alternative 1 Java — alternative 2
3160	Find the Number of Distinct Colors Among the Balls	Medium	Java
3163	String Compression III	Medium	Java
3169	Count Days Without Meetings	Medium	Java — line sweep Java
3170	Lexicographically Minimum String After Removing Stars	Medium	Java — heap Java
3174	Clear Digits	Easy	Java
3190	Find Minimum Operations to Make All Elements Divisible by Three	Easy	Java
3191	Minimum Operations to Make Binary Array Elements Equal to One I	Medium	Java
3195	Find the Minimum Area to Cover All Ones I	Medium	Java — simulation Java
3203	Find Minimum Diameter After Merging Two Trees	Hard	Java
3208	Alternating Groups II	Medium	Java
3217	Delete Nodes from Linked List Present in Array	Medium	Java
3223	Minimum Length of String After Operations	Medium	Java
3227	Vowels Game in a String	Medium	Java — stream api Java
3243	Shortest Distance After Road Addition Queries I	Medium	Java
3254	Find the Power of K Size Subarrays I	Medium	Java
3264	Final Array State After K Multiplication Operations I	Easy	Java
3286	Find a Safe Walk Through a Grid	Medium	Java
3289	The Two Sneaky Numbers of Digitville	Easy	Java — memo Java — sorting Java
3300	Minimum Element After Replacement with Digit Sum	Easy	Java
3304	Find the K Th Character in String Game I	Easy	Java — simulation Java
3306	Count of Substrings Containing Every Vowel and K Consonants II	Medium	Java
3330	Find the Original Typed String I	Easy	Java
3335	Total Characters in String After Transformations I	Medium	Java — circular array Java — simulation Java
3337	Total Characters in String After Transformations II	Hard	Java
3341	Find Minimum Time to Reach Last Room I	Medium	Java
3342	Find Minimum Time to Reach Last Room II	Medium	Java
3343	Count Number of Balanced Permutations	Hard	Java
3350	Adjacent Increasing Subarrays Detection II	Medium	Java
3354	Make Array Elements Equal to Zero	Easy	Java
3355	Zero Array Transformation I	Medium	Java
3356	Zero Array Transformation II	Medium	Java
3362	Zero Array Transformation III	Medium	Java
3372	Maximize the Number of Target Nodes After Connecting Trees I	Medium	Java — bfs Java — dfs Java
3373	Maximize the Number of Target Nodes After Connecting Trees II	Hard	Java
3375	Minimum Operations to Make Array Values Equal to K	Easy	Java — sorting Java
3392	Count Subarrays of Length Three with a Condition	Easy	Java
3394	Check If Grid Can Be Cut into Sections	Medium	Java
3396	Minimum Number of Operations to Make Elements in Array Distinct	Easy	Java — hashmap Java
3397	Maximum Number of Distinct Elements After Operations	Medium	Java — treeset Java
3403	Find the Lexicographically Largest String from the Box I	Medium	Java
3408	Design Task Manager	Medium	Java
3423	Maximum Difference Between Adjacent Elements in a Circular Array	Easy	Java
3433	Count Mentions Per User	Medium	Java — simulation Java
3439	Reschedule Meetings for Maximum Free Time I	Medium	Java
3440	Reschedule Meetings for Maximum Free Time II	Medium	Java
3442	Maximum Difference Between Even and Odd Frequency I	Easy	Java
3443	Maximum Manhattan Distance After K Changes	Medium	Java
3445	Maximum Difference Between Even and Odd Frequency II	Hard	Java
3461	Check If Digits Are Equal in String After Operations I	Easy	Java
3477	Fruits into Baskets II	Easy	Java
3483	Unique 3 Digit Even Numbers	Easy	Java
3484	Design Spreadsheet	Medium	Java
3487	Maximum Unique Subarray Sum After Deletion	Easy	Java
3494	Find the Minimum Amount of Time to Brew Potions	Medium	Java
3498	Reverse Degree of a String	Easy	Java
3508	Implement Router	Medium	Java — myDesign TLE Java
3512	Minimum Operations to Make Array Sum Divisible by K	Easy	Java
3516	Find Closest Person	Easy	Java
3536	Maximum Product of Two Digits	Easy	Java
3541	Find Most Frequent Vowel and Consonant	Easy	Java
3542	Minimum Operations to Convert All Elements to Zero	Medium	Java
3558	Number of Ways to Assign Edge Weights I	Medium	Java
3583	Count Special Triplets	Medium	Java
3606	Coupon Code Validator	Easy	Java
3612	Process String with Special Operations I	Medium	Java
3614	Process String with Special Operations II	Hard	Java
3620	Network Recovery Pathways	Hard	Java
3622	Check Divisibility by Digit Sum and Product	Easy	Java
3633	Earliest Finish Time for Land and Water Rides I	Easy	Java
3635	Earliest Finish Time for Land and Water Rides II	Medium	Java
3689	Maximum Total Subarray Value I	Medium	Java
3691	Maximum Total Subarray Value II	Hard	Java
3699	Number of Zigzag Arrays I	Hard	Java
3737	Count Subarrays with Majority Element I	Medium	Java — prefix sum Java — segment tree naive Java — segment tree — alternative 1 Java Java — segment tree — alternative 2
3751	Total Waviness of Numbers in Range I	Medium	Java — naive Java
3838	Weighted Word Mapping	Easy	Java
3871	Count Commas in Range II	Medium	Java — direct Java
3875	Construct Uniform Parity Array I	Easy	Java
3876	Construct Uniform Parity Array II	Medium	Java
3904	Smallest Stable Index II	Medium	Java
4034	Minimum Bishop Moves to Reach Target	Medium	Java
4036	Lexicographically Largest String After Pair Transformations	Medium	Java
4048	Count Values with Equally Spaced Occurrences I	Easy	Java
4049	Count Values with Equally Spaced Occurrences II	Medium	Java
4050	Minimum Days to Score Exactly N Points	Medium	Java