LeetCode

	#	Title	Solution	Explanation	Difficulty
☐	1	Two Sum	Java	Explanation	Easy
☐	2	Add Two Numbers	Java	Explanation	Medium
☐	3	Longest Substring Without Repeating Characters	Java	Explanation	Medium
☐	4	Median of Two Sorted Arrays	Java	Explanation	Hard
☐	5	Longest Palindromic Substring	Java	Explanation	Medium
☐	6	ZigZag Conversion	Java	Explanation	Medium
☐	7	Reverse Integer	Java	Explanation	Easy
☐	8	String to Integer (atoi)	Java	Explanation	Medium
☐	9	Palindrome Number	Java	Explanation	Easy
☐	10	Regular Expression Matching	Java	Explanation	Hard
☐	11	Container With Most Water	Java	Explanation	Medium
☐	12	Integer to Roman	Java	Explanation	Medium
☐	13	Roman to Integer	Java	Explanation	Easy
☐	14	Longest Common Prefix	Java	Explanation	Easy
☐	15	3Sum	Java	Explanation	Medium
☐	16	3Sum Closest	Java	Explanation	Medium
☐	17	Letter Combinations of a Phone Number	Java	Explanation	Medium
☐	18	4Sum	Java	Explanation	Medium
☐	19	Remove Nth Node From End of List	Java	Explanation	Medium
☐	20	Valid Parentheses	Java	Explanation	Easy
☐	21	Merge Two Sorted Lists	Java	Explanation	Easy
☐	22	Generate Parentheses	Java	Explanation	Medium
☐	23	Merge k Sorted Lists	Java	Explanation	Hard
☐	24	Swap Nodes in Pairs	Java	Explanation	Medium
☐	25	Reverse Nodes in k-Group	Java	Explanation	Hard
☐	26	Remove Duplicates from Sorted Array	Java	Explanation	Easy
☐	27	Remove Element	Java	Explanation	Easy
☐	28	Implement strStr()	Java	Explanation	Easy
☐	29	Divide Two Integers	Java	Explanation	Medium
☐	30	Substring with Concatenation of All Words	Java	Explanation	Hard
☐	31	Next Permutation	Java	Explanation	Medium
☐	32	Longest Valid Parentheses	Java	Explanation	Hard
☐	33	Search in Rotated Sorted Array	Java	Explanation	Medium
☐	34	Find First and Last Position of Element in Sorted Array	Java	Explanation	Medium
☐	35	Search Insert Position	Java	Explanation	Easy
☐	36	Valid Sudoku	Java	Explanation	Medium
☐	37	Sudoku Solver	Java	Explanation	Hard
☐	38	Count and Say	Java	Explanation	Easy
☐	39	Combination Sum	Java	Explanation	Medium
☐	40	Combination Sum II	Java	Explanation	Medium
☐	41	First Missing Positive	Java	Explanation	Hard
☐	42	Trapping Rain Water	Java	Explanation	Hard
☐	43	Multiply Strings	Java	Explanation	Medium
☐	44	Wildcard Matching	Java	Explanation	Hard
☐	45	Jump Game II	Java	Explanation	Hard
☐	46	Permutations	Java	Explanation	Medium
☐	47	Permutations II	Java	Explanation	Medium
☐	48	Rotate Image	Java	Explanation	Medium
☐	49	Group Anagrams	Java	Explanation	Medium
☐	50	Pow(x, n)	Java	Explanation	Medium
☐	51	N-Queens	Java	Explanation	Hard
☐	52	N-Queens II	Java	Explanation	Hard
☐	53	Maximum Subarray	Java	Explanation	Easy
☐	54	Spiral Matrix	Java	Explanation	Medium
☐	55	Jump Game	Java	Explanation	Medium
☐	56	Merge Intervals	Java	Explanation	Medium
☐	57	Insert Interval	Java	Explanation	Hard
☐	58	Length of Last Word	Java	Explanation	Easy
☐	59	Spiral Matrix II	Java	Explanation	Medium
☐	60	Permutation Sequence	Java	Explanation	Medium
☐	61	Rotate List	Java	Explanation	Medium
☐	62	Unique Paths	Java	Explanation	Medium
☐	63	Unique Paths II	Java	Explanation	Medium
☐	64	Minimum Path Sum	Java	Explanation	Medium
☐	65	Valid Number	Java	Explanation	Hard
☐	66	Plus One	Java	Explanation	Easy
☐	67	Add Binary	Java	Explanation	Easy
☐	68	Text Justification	Java	Explanation	Hard
☐	69	Sqrt(x)	Java	Explanation	Easy
☐	70	Climbing Stairs	Java	Explanation	Easy
☐	71	Simplify Path	Java	Explanation	Medium
☐	72	Edit Distance	Java	Explanation	Hard
☐	73	Set Matrix Zeroes	Java	Explanation	Medium
☐	74	Search a 2D Matrix	Java	Explanation	Medium
☐	75	Sort Colors	Java	Explanation	Medium
☐	76	Minimum Window Substring	Java	Explanation	Hard
☐	77	Combinations	Java	Explanation	Medium
☐	78	Subsets	Java	Explanation	Medium
☐	79	Word Search	Java	Explanation	Medium
☐	80	Remove Duplicates from Sorted Array II	Java	Explanation	Medium
☐	81	Search in Rotated Sorted Array II	Java	Explanation	Medium
☐	82	Remove Duplicates from Sorted List II	Java	Explanation	Medium
☐	83	Remove Duplicates from Sorted List	Java	Explanation	Easy
☐	84	Largest Rectangle in Histogram	Java	Explanation	Hard
☐	85	Maximal Rectangle	Java	Explanation	Hard
☐	86	Partition List	Java	Explanation	Medium
☐	87	Scramble String	Java	Explanation	Hard
☐	88	Merge Sorted Array	Java	Explanation	Easy
☐	89	Gray Code	Java	Explanation	Medium
☐	90	Subsets II	Java	Explanation	Medium
☐	91	Decode Ways	Java	Explanation	Medium
☐	92	Reverse Linked List II	Java	Explanation	Medium
☐	93	Restore IP Addresses	Java	Explanation	Medium
☐	94	Binary Tree Inorder Traversal	Java	Explanation	Medium
☐	95	Unique Binary Search Trees II	Java	Explanation	Medium
☐	96	Unique Binary Search Trees	Java	Explanation	Medium
☐	97	Interleaving String	Java	Explanation	Hard
☐	98	Validate Binary Search Tree	Java	Explanation	Medium
☐	99	Recover Binary Search Tree	Java	Explanation	Hard
☑	100	Same Tree	Java	Explanation	Easy
☐	101	Symmetric Tree	Java	Explanation	Easy
☐	102	Binary Tree Level Order Traversal	Java	Explanation	Medium
☐	103	Binary Tree Zigzag Level Order Traversal	Java	Explanation	Medium
☐	104	Maximum Depth of Binary Tree	Java	Explanation	Easy
☐	105	Construct Binary Tree from Preorder and Inorder Traversal	Java	Explanation	Medium
☐	106	Construct Binary Tree from Inorder and Postorder Traversal	Java	Explanation	Medium
☐	107	Binary Tree Level Order Traversal II	Java	Explanation	Easy
☐	108	Convert Sorted Array to Binary Search Tree	Java	Explanation	Easy
☐	109	Convert Sorted List to Binary Search Tree	Java	Explanation	Medium
☐	110	Balanced Binary Tree	Java	Explanation	Easy
☐	111	Minimum Depth of Binary Tree	Java	Explanation	Easy
☐	112	Path Sum	Java	Explanation	Easy
☐	113	Path Sum II	Java	Explanation	Medium
☐	114	Flatten Binary Tree to Linked List	Java	Explanation	Medium
☐	115	Distinct Subsequences	Java	Explanation	Hard
☐	116	Populating Next Right Pointers in Each Node	Java	Explanation	Medium
☐	117	Populating Next Right Pointers in Each Node II	Java	Explanation	Medium
☐	118	Pascal’s Triangle	Java	Explanation	Easy
☐	119	Pascal’s Triangle II	Java	Explanation	Easy
☐	120	Triangle	Java	Explanation	Medium
☐	121	Best Time to Buy and Sell Stock	Java	Explanation	Easy
☐	122	Best Time to Buy and Sell Stock II	Java	Explanation	Easy
☐	123	Best Time to Buy and Sell Stock III	Java	Explanation	Hard
☐	124	Binary Tree Maximum Path Sum	Java	Explanation	Hard
☐	125	Valid Palindrome	Java	Explanation	Easy
☐	126	Word Ladder II	Java	Explanation	Hard
☐	127	Word Ladder	Java	Explanation	Medium
☐	128	Longest Consecutive Sequence	Java	Explanation	Hard
☐	129	Sum Root to Leaf Numbers	Java	Explanation	Medium
☐	130	Surrounded Regions	Java	Explanation	Medium
☐	131	Palindrome Partitioning	Java	Explanation	Medium
☐	132	Palindrome Partitioning II	Java	Explanation	Hard
☐	133	Clone Graph	Java	Explanation	Medium
☐	134	Gas Station	Java	Explanation	Medium
☐	135	Candy	Java	Explanation	Hard
☐	136	Single Number	Java	Explanation	Easy
☐	137	Single Number II	Java	Explanation	Medium
☐	138	Copy List with Random Pointer	Java	Explanation	Medium
☐	139	Word Break	Java	Explanation	Medium
☐	140	Word Break II	Java	Explanation	Hard
☐	141	Linked List Cycle	Java	Explanation	Easy
☐	142	Linked List Cycle II	Java	Explanation	Medium
☐	143	Reorder List	Java	Explanation	Medium
☐	144	Binary Tree Preorder Traversal	Java	Explanation	Medium
☐	145	Binary Tree Postorder Traversal	Java	Explanation	Hard
☐	146	LRU Cache	Java	Explanation	Medium
☐	147	Insertion Sort List	Java	Explanation	Medium
☐	148	Sort List	Java	Explanation	Medium
☐	149	Max Points on a Line	Java	Explanation	Hard
☐	150	Evaluate Reverse Polish Notation	Java	Explanation	Medium
☐	151	Reverse Words in a String	Java	Explanation	Medium
☐	152	Maximum Product Subarray	Java	Explanation	Medium
☐	153	Find Minimum in Rotated Sorted Array	Java	Explanation	Medium
☐	154	Find Minimum in Rotated Sorted Array II	Java	Explanation	Hard
☐	155	Min Stack	Java	Explanation	Easy
☐	156	Binary Tree Upside Down	Java	Explanation	Medium
☐	157	Read N Characters Given Read4	Java	Explanation	Easy
☐	158	Read N Characters Given Read4 II - Call multiple times	Java	Explanation	Hard
☐	159	Longest Substring with At Most Two Distinct Characters	Java	Explanation	Hard
☐	160	Intersection of Two Linked Lists	Java	Explanation	Easy
☐	161	One Edit Distance	Java	Explanation	Medium
☐	162	Find Peak Element	Java	Explanation	Medium
☐	163	Missing Ranges	Java	Explanation	Medium
☐	164	Maximum Gap	Java	Explanation	Hard
☐	165	Compare Version Numbers	Java	Explanation	Medium
☐	166	Fraction to Recurring Decimal	Java	Explanation	Medium
☐	167	Two Sum II - Input array is sorted	Java	Explanation	Easy
☐	168	Excel Sheet Column Title	Java	Explanation	Easy
☐	169	Majority Element	Java	Explanation	Easy
☐	170	Two Sum III - Data structure design	Java	Explanation	Easy
☐	171	Excel Sheet Column Number	Java	Explanation	Easy
☐	172	Factorial Trailing Zeroes	Java	Explanation	Easy
☐	173	Binary Search Tree Iterator	Java	Explanation	Medium
☐	174	Dungeon Game	Java	Explanation	Hard
☐	179	Largest Number	Java	Explanation	Medium
☐	186	Reverse Words in a String II	Java	Explanation	Medium
☐	187	Repeated DNA Sequences	Java	Explanation	Medium
☐	188	Best Time to Buy and Sell Stock IV	Java	Explanation	Hard
☐	189	Rotate Array	Java	Explanation	Easy
☐	190	Reverse Bits	Java	Explanation	Easy
☐	191	Number of 1 Bits	Java	Explanation	Easy
☐	198	House Robber	Java	Explanation	Easy
☐	199	Binary Tree Right Side View	Java	Explanation	Medium
☐	200	Number of Islands	Java	Explanation	Medium
☐	201	Bitwise AND of Numbers Range	Java	Explanation	Medium
☐	202	Happy Number	Java	Explanation	Easy
☐	203	Remove Linked List Elements	Java	Explanation	Easy
☐	204	Count Primes	Java	Explanation	Easy
☐	205	Isomorphic Strings	Java	Explanation	Easy
☐	206	Reverse Linked List	Java	Explanation	Easy
☑	207	Course Schedule	Java	Explanation	Medium
☐	208	Implement Trie (Prefix Tree)	Java	Explanation	Medium
☐	209	Minimum Size Subarray Sum	Java	Explanation	Medium
☑	210	Course Schedule II	Java	Explanation	Medium
☐	211	Add and Search Word - Data structure design	Java	Explanation	Medium
☐	212	Word Search II	Java	Explanation	Hard
☐	213	House Robber II	Java	Explanation	Medium
☐	214	Shortest Palindrome	Java	Explanation	Hard
☐	215	Kth Largest Element in an Array	Java	Explanation	Medium
☐	216	Combination Sum III	Java	Explanation	Medium
☐	217	Contains Duplicate	Java	Explanation	Easy
☐	218	The Skyline Problem	Java	Explanation	Hard
☐	219	Contains Duplicate II	Java	Explanation	Easy
☐	220	Contains Duplicate III	Java	Explanation	Medium
☐	221	Maximal Square	Java	Explanation	Medium
☐	222	Count Complete Tree Nodes	Java	Explanation	Medium
☐	223	Rectangle Area	Java	Explanation	Medium
☐	224	Basic Calculator	Java	Explanation	Hard
☐	225	Implement Stack using Queues	Java	Explanation	Easy
☐	226	Invert Binary Tree	Java	Explanation	Easy
☐	227	Basic Calculator II	Java	Explanation	Medium
☐	228	Summary Ranges	Java	Explanation	Medium
☐	229	Majority Element II	Java	Explanation	Medium
☐	230	Kth Smallest Element in a BST	Java	Explanation	Medium
☐	231	Power of Two	Java	Explanation	Easy
☐	232	Implement Queue using Stacks	Java	Explanation	Easy
☐	233	Number of Digit One	Java	Explanation	Hard
☐	234	Palindrome Linked List	Java	Explanation	Easy
☐	235	Lowest Common Ancestor of a Binary Search Tree	Java	Explanation	Easy
☐	236	Lowest Common Ancestor of a Binary Tree	Java	Explanation	Medium
☐	237	Delete Node in a Linked List	Java	Explanation	Easy
☐	238	Product of Array Except Self	Java	Explanation	Medium
☐	239	Sliding Window Maximum	Java	Explanation	Hard
☐	240	Search a 2D Matrix II	Java	Explanation	Medium
☐	241	Different Ways to Add Parentheses	Java	Explanation	Medium
☐	242	Valid Anagram	Java	Explanation	Easy
☐	243	Shortest Word Distance	Java	Explanation	Easy
☐	244	Shortest Word Distance II	Java	Explanation	Medium
☐	245	Shortest Word Distance III	Java	Explanation	Medium
☐	246	Strobogrammatic Number	Java	Explanation	Easy
☐	247	Strobogrammatic Number II	Java	Explanation	Medium
☐	248	Strobogrammatic Number III	Java	Explanation	Hard
☐	249	Group Shifted Strings	Java	Explanation	Medium
☐	250	Count Univalue Subtrees	Java	Explanation	Medium
☐	251	Flatten 2D Vector	Java	Explanation	Medium
☐	252	Meeting Rooms	Java	Explanation	Easy
☐	253	Meeting Rooms II	Java	Explanation	Medium
☐	254	Factor Combinations	Java	Explanation	Medium
☐	255	Verify Preorder Sequence in Binary Search Tree	Java	Explanation	Medium
☐	256	Paint House	Java	Explanation	Easy
☐	257	Binary Tree Paths	Java	Explanation	Easy
☐	258	Add Digits	Java	Explanation	Easy
☐	259	3Sum Smaller	Java	Explanation	Medium
☐	260	Single Number III	Java	Explanation	Medium
☐	261	Graph Valid Tree	Java	Explanation	Medium
☐	263	Ugly Number	Java	Explanation	Easy
☐	264	Ugly Number II	Java	Explanation	Medium
☐	265	Paint House II	Java	Explanation	Hard
☐	266	Palindrome Permutation	Java	Explanation	Easy
☐	267	Palindrome Permutation II	Java	Explanation	Medium
☐	268	Missing Number	Java	Explanation	Easy
☐	269	Alien Dictionary	Java	Explanation	Hard
☐	270	Closest Binary Search Tree Value	Java	Explanation	Easy
☐	271	Encode and Decode Strings	Java	Explanation	Medium
☐	272	Closest Binary Search Tree Value II	Java	Explanation	Hard
☐	273	Integer to English Words	Java	Explanation	Hard
☐	274	H-Index	Java	Explanation	Medium
☐	275	H-Index II	Java	Explanation	Medium
☐	276	Paint Fence	Java	Explanation	Easy
☐	277	Find the Celebrity	Java	Explanation	Medium
☐	278	First Bad Version	Java	Explanation	Easy
☐	279	Perfect Squares	Java	Explanation	Medium
☐	280	Wiggle Sort	Java	Explanation	Medium
☐	281	Zigzag Iterator	Java	Explanation	Medium
☐	282	Expression Add Operators	Java	Explanation	Hard
☐	283	Move Zeroes	Java	Explanation	Easy
☐	284	Peeking Iterator	Java	Explanation	Medium
☐	285	Inorder Successor in BST	Java	Explanation	Medium
☐	286	Walls and Gates	Java	Explanation	Medium
☐	287	Find the Duplicate Number	Java	Explanation	Medium
☐	288	Unique Word Abbreviation	Java	Explanation	Medium
☐	289	Game of Life	Java	Explanation	Medium
☐	290	Word Pattern	Java	Explanation	Easy
☐	291	Word Pattern II	Java	Explanation	Hard
☐	292	Nim Game	Java	Explanation	Easy
☐	293	Flip Game	Java	Explanation	Easy
☐	294	Flip Game II	Java	Explanation	Medium
☐	295	Find Median from Data Stream	Java	Explanation	Hard
☐	296	Best Meeting Point	Java	Explanation	Hard
☐	297	Serialize and Deserialize Binary Tree	Java	Explanation	Hard
☐	298	Binary Tree Longest Consecutive Sequence	Java	Explanation	Medium
☐	299	Bulls and Cows	Java	Explanation	Easy
☐	300	Longest Increasing Subsequence	Java	Explanation	Medium
☐	301	Remove Invalid Parentheses	Java	Explanation	Hard
☐	302	Smallest Rectangle Enclosing Black Pixels	Java	Explanation	Hard
☐	303	Range Sum Query - Immutable	Java	Explanation	Easy
☐	304	Range Sum Query 2D - Immutable	Java	Explanation	Medium
☐	305	Number of Islands II	Java	Explanation	Hard
☐	306	Additive Number	Java	Explanation	Medium
☐	307	Range Sum Query - Mutable	Java	Explanation	Medium
☐	308	Range Sum Query 2D - Mutable	Java	Explanation	Hard
☐	309	Best Time to Buy and Sell Stock with Cooldown	Java	Explanation	Medium
☐	310	Minimum Height Trees	Java	Explanation	Medium
☐	311	Sparse Matrix Multiplication	Java	Explanation	Medium
☐	312	Burst Balloons	Java	Explanation	Hard
☐	313	Super Ugly Number	Java	Explanation	Medium
☐	314	Binary Tree Vertical Order Traversal	Java	Explanation	Medium
☐	315	Count of Smaller Numbers After Self	Java	Explanation	Hard
☐	316	Remove Duplicate Letters	Java	Explanation	Hard
☐	317	Shortest Distance from All Buildings	Java	Explanation	Hard
☐	318	Maximum Product of Word Lengths	Java	Explanation	Medium
☐	319	Bulb Switcher	Java	Explanation	Medium
☐	320	Generalized Abbreviation	Java	Explanation	Medium
☐	321	Create Maximum Number	Java	Explanation	Hard
☐	322	Coin Change	Java	Explanation	Medium
☐	323	Number of Connected Components in an Undirected Graph	Java	Explanation	Medium
☐	324	Wiggle Sort II	Java	Explanation	Medium
☐	325	Maximum Size Subarray Sum Equals k	Java	Explanation	Medium
☐	326	Power of Three	Java	Explanation	Easy
☐	327	Count of Range Sum	Java	Explanation	Hard
☐	328	Odd Even Linked List	Java	Explanation	Medium
☐	329	Longest Increasing Path in a Matrix	Java	Explanation	Hard
☐	330	Patching Array	Java	Explanation	Hard
☐	331	Verify Preorder Serialization of a Binary Tree	Java	Explanation	Medium
☐	332	Reconstruct Itinerary	Java	Explanation	Medium
☐	333	Largest BST Subtree	Java	Explanation	Medium
☐	334	Increasing Triplet Subsequence	Java	Explanation	Medium
☐	335	Self Crossing	Java	Explanation	Hard
☐	336	Palindrome Pairs	Java	Explanation	Hard
☐	337	House Robber III	Java	Explanation	Medium
☐	338	Counting Bits	Java	Explanation	Medium
☐	339	Nested List Weight Sum	Java	Explanation	Easy
☐	340	Longest Substring with At Most K Distinct Characters	Java	Explanation	Hard
☐	341	Flatten Nested List Iterator	Java	Explanation	Medium
☐	342	Power of Four	Java	Explanation	Easy
☐	343	Integer Break	Java	Explanation	Medium
☐	344	Reverse String	Java	Explanation	Easy
☐	345	Reverse Vowels of a String	Java	Explanation	Easy
☐	346	Moving Average from Data Stream	Java	Explanation	Easy
☐	347	Top K Frequent Elements	Java	Explanation	Medium
☐	348	Design Tic-Tac-Toe	Java	Explanation	Medium
☐	349	Intersection of Two Arrays	Java	Explanation	Easy
☐	350	Intersection of Two Arrays II	Java	Explanation	Easy
☐	351	Android Unlock Patterns	Java	Explanation	Medium
☐	352	Data Stream as Disjoint Intervals	Java	Explanation	Hard
☐	353	Design Snake Game	Java	Explanation	Medium
☐	354	Russian Doll Envelopes	Java	Explanation	Hard
☐	355	Design Twitter	Java	Explanation	Medium
☐	356	Line Reflection	Java	Explanation	Medium
☐	357	Count Numbers with Unique Digits	Java	Explanation	Medium
☐	358	Rearrange String k Distance Apart	Java	Explanation	Hard
☐	359	Logger Rate Limiter	Java	Explanation	Easy
☐	360	Sort Transformed Array	Java	Explanation	Medium
☐	361	Bomb Enemy	Java	Explanation	Medium
☐	362	Design Hit Counter	Java	Explanation	Medium
☐	363	Max Sum of Rectangle No Larger Than K	Java	Explanation	Hard
☐	364	Nested List Weight Sum II	Java	Explanation	Medium
☐	365	Water and Jug Problem	Java	Explanation	Medium
☐	366	Find Leaves of Binary Tree	Java	Explanation	Medium
☐	367	Valid Perfect Square	Java	Explanation	Easy
☐	368	Largest Divisible Subset	Java	Explanation	Medium
☐	369	Plus One Linked List	Java	Explanation	Medium
☐	370	Range Addition	Java	Explanation	Medium
☐	371	Sum of Two Integers	Java	Explanation	Easy
☐	372	Super Pow	Java	Explanation	Medium
☐	373	Find K Pairs with Smallest Sums	Java	Explanation	Medium
☐	374	Guess Number Higher or Lower	Java	Explanation	Easy
☐	375	Guess Number Higher or Lower II	Java	Explanation	Medium
☐	376	Wiggle Subsequence	Java	Explanation	Medium
☐	377	Combination Sum IV	Java	Explanation	Medium
☐	378	Kth Smallest Element in a Sorted Matrix	Java	Explanation	Medium
☐	379	Design Phone Directory	Java	Explanation	Medium
☐	380	Insert Delete GetRandom O(1)	Java	Explanation	Medium
☐	381	Insert Delete GetRandom O(1) - Duplicates allowed	Java	Explanation	Hard
☐	382	Linked List Random Node	Java	Explanation	Medium
☐	383	Ransom Note	Java	Explanation	Easy
☐	384	Shuffle an Array	Java	Explanation	Medium
☐	385	Mini Parser	Java	Explanation	Medium
☐	386	Lexicographical Numbers	Java	Explanation	Medium
☐	387	First Unique Character in a String	Java	Explanation	Easy
☐	388	Longest Absolute File Path	Java	Explanation	Medium
☐	389	Find the Difference	Java	Explanation	Easy
☐	390	Elimination Game	Java	Explanation	Medium
☐	391	Perfect Rectangle	Java	Explanation	Hard
☐	392	Is Subsequence	Java	Explanation	Easy
☐	393	UTF-8 Validation	Java	Explanation	Medium
☐	394	Decode String	Java	Explanation	Medium
☐	395	Longest Substring with At Least K Repeating Characters	Java	Explanation	Medium
☐	396	Rotate Function	Java	Explanation	Medium
☐	397	Integer Replacement	Java	Explanation	Medium
☐	398	Random Pick Index	Java	Explanation	Medium
☐	399	Evaluate Division	Java	Explanation	Medium
☐	400	Nth Digit	Java	Explanation	Medium
☐	401	Binary Watch	Java	Explanation	Easy
☐	402	Remove K Digits	Java	Explanation	Medium
☐	403	Frog Jump	Java	Explanation	Hard
☐	404	Sum of Left Leaves	Java	Explanation	Easy
☐	405	Convert a Number to Hexadecimal	Java	Explanation	Easy
☐	406	Queue Reconstruction by Height	Java	Explanation	Medium
☐	407	Trapping Rain Water II	Java	Explanation	Hard
☐	408	Valid Word Abbreviation	Java	Explanation	Easy
☐	409	Longest Palindrome	Java	Explanation	Easy
☐	410	Split Array Largest Sum	Java	Explanation	Hard
☐	411	Minimum Unique Word Abbreviation	Java	Explanation	Hard
☐	412	Fizz Buzz	Java	Explanation	Easy
☐	413	Arithmetic Slices	Java	Explanation	Medium
☐	414	Third Maximum Number	Java	Explanation	Easy
☐	415	Add Strings	Java	Explanation	Easy
☐	416	Partition Equal Subset Sum	Java	Explanation	Medium
☐	417	Pacific Atlantic Water Flow	Java	Explanation	Medium
☐	418	Sentence Screen Fitting	Java	Explanation	Medium
☐	419	Battleships in a Board	Java	Explanation	Medium
☐	420	Strong Password Checker	Java	Explanation	Hard
☐	421	Maximum XOR of Two Numbers in an Array	Java	Explanation	Medium
☐	422	Valid Word Square	Java	Explanation	Easy
☐	423	Reconstruct Original Digits from English	Java	Explanation	Medium
☐	424	Longest Repeating Character Replacement	Java	Explanation	Medium
☐	425	Word Squares	Java	Explanation	Hard
☐	426	Convert Binary Search Tree to Sorted Doubly Linked List	Java	Explanation	Medium
☐	427	Construct Quad Tree	Java	Explanation	Medium
☐	428	Serialize and Deserialize N-ary Tree	Java	Explanation	Hard
☐	429	N-ary Tree Level Order Traversal	Java	Explanation	Easy
☐	430	Flatten a Multilevel Doubly Linked List	Java	Explanation	Medium
☐	431	Encode N-ary Tree to Binary Tree	Java	Explanation	Hard
☐	432	All O`one Data Structure	Java	Explanation	Hard
☐	433	Minimum Genetic Mutation	Java	Explanation	Medium
☐	434	Number of Segments in a String	Java	Explanation	Easy
☐	435	Non-overlapping Intervals	Java	Explanation	Medium
☐	436	Find Right Interval	Java	Explanation	Medium
☐	437	Path Sum III	Java	Explanation	Easy
☐	438	Find All Anagrams in a String	Java	Explanation	Medium
☐	439	Ternary Expression Parser	Java	Explanation	Medium
☐	440	K-th Smallest in Lexicographical Order	Java	Explanation	Hard
☐	441	Arranging Coins	Java	Explanation	Easy
☐	442	Find All Duplicates in an Array	Java	Explanation	Medium
☐	443	String Compression	Java	Explanation	Easy
☐	444	Sequence Reconstruction	Java	Explanation	Medium
☐	445	Add Two Numbers II	Java	Explanation	Medium
☐	446	Arithmetic Slices II - Subsequence	Java	Explanation	Hard
☐	447	Number of Boomerangs	Java	Explanation	Easy
☐	448	Find All Numbers Disappeared in an Array	Java	Explanation	Easy
☐	449	Serialize and Deserialize BST	Java	Explanation	Medium
☐	450	Delete Node in a BST	Java	Explanation	Medium
☐	451	Sort Characters By Frequency	Java	Explanation	Medium
☐	452	Minimum Number of Arrows to Burst Balloons	Java	Explanation	Medium
☐	453	Minimum Moves to Equal Array Elements	Java	Explanation	Easy
☐	454	4Sum II	Java	Explanation	Medium
☐	455	Assign Cookies	Java	Explanation	Easy
☐	456	132 Pattern	Java	Explanation	Medium
☐	457	Circular Array Loop	Java	Explanation	Medium
☐	458	Poor Pigs	Java	Explanation	Hard
☐	459	Repeated Substring Pattern	Java	Explanation	Easy
☐	460	LFU Cache	Java	Explanation	Hard
☐	461	Hamming Distance	Java	Explanation	Easy
☐	462	Minimum Moves to Equal Array Elements II	Java	Explanation	Medium
☐	463	Island Perimeter	Java	Explanation	Easy
☐	464	Can I Win	Java	Explanation	Medium
☐	465	Optimal Account Balancing	Java	Explanation	Hard
☐	466	Count The Repetitions	Java	Explanation	Hard
☐	467	Unique Substrings in Wraparound String	Java	Explanation	Medium
☐	468	Validate IP Address	Java	Explanation	Medium
☐	469	Convex Polygon	Java	Explanation	Medium
☐	470	Implement Rand10() Using Rand7()	Java	Explanation	Medium
☐	471	Encode String with Shortest Length	Java	Explanation	Hard
☐	472	Concatenated Words	Java	Explanation	Hard
☐	473	Matchsticks to Square	Java	Explanation	Medium
☐	474	Ones and Zeroes	Java	Explanation	Medium
☐	475	Heaters	Java	Explanation	Easy
☐	476	Number Complement	Java	Explanation	Easy
☐	477	Total Hamming Distance	Java	Explanation	Medium
☐	478	Generate Random Point in a Circle	Java	Explanation	Medium
☐	479	Largest Palindrome Product	Java	Explanation	Hard
☐	480	Sliding Window Median	Java	Explanation	Hard
☐	481	Magical String	Java	Explanation	Medium
☐	482	License Key Formatting	Java	Explanation	Easy
☐	483	Smallest Good Base	Java	Explanation	Hard
☐	484	Find Permutation	Java	Explanation	Medium
☐	485	Max Consecutive Ones	Java	Explanation	Easy
☐	486	Predict the Winner	Java	Explanation	Medium
☐	487	Max Consecutive Ones II	Java	Explanation	Medium
☐	488	Zuma Game	Java	Explanation	Hard
☐	489	Robot Room Cleaner	Java	Explanation	Hard
☐	490	The Maze	Java	Explanation	Medium
☐	491	Increasing Subsequences	Java	Explanation	Medium
☐	492	Construct the Rectangle	Java	Explanation	Easy
☐	493	Reverse Pairs	Java	Explanation	Hard
☐	494	Target Sum	Java	Explanation	Medium
☐	495	Teemo Attacking	Java	Explanation	Medium
☐	496	Next Greater Element I	Java	Explanation	Easy
☐	497	Random Point in Non-overlapping Rectangles	Java	Explanation	Medium
☐	498	Diagonal Traverse	Java	Explanation	Medium
☐	499	The Maze III	Java	Explanation	Hard
☐	500	Keyboard Row	Java	Explanation	Easy
☐	501	Find Mode in Binary Search Tree	Java	Explanation	Easy
☐	502	IPO	Java	Explanation	Hard
☐	503	Next Greater Element II	Java	Explanation	Medium
☐	504	Base 7	Java	Explanation	Easy
☐	505	The Maze II	Java	Explanation	Medium
☐	506	Relative Ranks	Java	Explanation	Easy
☐	507	Perfect Number	Java	Explanation	Easy
☐	508	Most Frequent Subtree Sum	Java	Explanation	Medium
☐	509	Fibonacci Number	Java	Explanation	Easy
☐	510	Inorder Successor in BST II	Java	Explanation	Medium
☐	513	Find Bottom Left Tree Value	Java	Explanation	Medium
☐	514	Freedom Trail	Java	Explanation	Hard
☐	515	Find Largest Value in Each Tree Row	Java	Explanation	Medium
☐	516	Longest Palindromic Subsequence	Java	Explanation	Medium
☐	517	Super Washing Machines	Java	Explanation	Hard
☐	518	Coin Change 2	Java	Explanation	Medium
☐	519	Random Flip Matrix	Java	Explanation	Medium
☐	520	Detect Capital	Java	Explanation	Easy
☐	521	Longest Uncommon Subsequence I	Java	Explanation	Easy
☐	522	Longest Uncommon Subsequence II	Java	Explanation	Medium
☐	523	Continuous Subarray Sum	Java	Explanation	Medium
☐	524	Longest Word in Dictionary through Deleting	Java	Explanation	Medium
☐	525	Contiguous Array	Java	Explanation	Medium
☐	526	Beautiful Arrangement	Java	Explanation	Medium
☐	527	Word Abbreviation	Java	Explanation	Hard
☐	528	Random Pick with Weight	Java	Explanation	Medium
☐	529	Minesweeper	Java	Explanation	Medium
☐	530	Minimum Absolute Difference in BST	Java	Explanation	Easy
☐	531	Lonely Pixel I	Java	Explanation	Medium
☐	532	K-diff Pairs in an Array	Java	Explanation	Easy
☐	533	Lonely Pixel II	Java	Explanation	Medium
☐	535	Encode and Decode TinyURL	Java	Explanation	Medium
☐	536	Construct Binary Tree from String	Java	Explanation	Medium
☐	537	Complex Number Multiplication	Java	Explanation	Medium
☐	538	Convert BST to Greater Tree	Java	Explanation	Easy
☐	539	Minimum Time Difference	Java	Explanation	Medium
☐	540	Single Element in a Sorted Array	Java	Explanation	Medium
☐	541	Reverse String II	Java	Explanation	Easy
☐	542	01 Matrix	Java	Explanation	Medium
☐	543	Diameter of Binary Tree	Java	Explanation	Easy
☐	544	Output Contest Matches	Java	Explanation	Medium
☐	545	Boundary of Binary Tree	Java	Explanation	Medium
☐	546	Remove Boxes	Java	Explanation	Hard
☐	547	Friend Circles	Java	Explanation	Medium
☐	548	Split Array with Equal Sum	Java	Explanation	Medium
☐	549	Binary Tree Longest Consecutive Sequence II	Java	Explanation	Medium
☐	551	Student Attendance Record I	Java	Explanation	Easy
☐	552	Student Attendance Record II	Java	Explanation	Hard
☐	553	Optimal Division	Java	Explanation	Medium
☐	554	Brick Wall	Java	Explanation	Medium
☐	555	Split Concatenated Strings	Java	Explanation	Medium
☐	556	Next Greater Element III	Java	Explanation	Medium
☐	557	Reverse Words in a String III	Java	Explanation	Easy
☐	558	Quad Tree Intersection	Java	Explanation	Easy
☐	559	Maximum Depth of N-ary Tree	Java	Explanation	Easy
☐	560	Subarray Sum Equals K	Java	Explanation	Medium
☐	561	Array Partition I	Java	Explanation	Easy
☐	562	Longest Line of Consecutive One in Matrix	Java	Explanation	Medium
☐	563	Binary Tree Tilt	Java	Explanation	Easy
☐	564	Find the Closest Palindrome	Java	Explanation	Hard
☐	565	Array Nesting	Java	Explanation	Medium
☐	566	Reshape the Matrix	Java	Explanation	Easy
☐	567	Permutation in String	Java	Explanation	Medium
☐	568	Maximum Vacation Days	Java	Explanation	Hard
☑	572	Subtree of Another Tree	Java	Explanation	Easy
☐	573	Squirrel Simulation	Java	Explanation	Medium
☐	575	Distribute Candies	Java	Explanation	Easy
☐	576	Out of Boundary Paths	Java	Explanation	Medium
☐	581	Shortest Unsorted Continuous Subarray	Java	Explanation	Easy
☐	582	Kill Process	Java	Explanation	Medium
☐	583	Delete Operation for Two Strings	Java	Explanation	Medium
☐	587	Erect the Fence	Java	Explanation	Hard
☐	588	Design In-Memory File System	Java	Explanation	Hard
☐	589	N-ary Tree Preorder Traversal	Java	Explanation	Easy
☐	590	N-ary Tree Postorder Traversal	Java	Explanation	Easy
☐	591	Tag Validator	Java	Explanation	Hard
☐	592	Fraction Addition and Subtraction	Java	Explanation	Medium
☐	593	Valid Square	Java	Explanation	Medium
☐	594	Longest Harmonious Subsequence	Java	Explanation	Easy
☐	598	Range Addition II	Java	Explanation	Easy
☐	599	Minimum Index Sum of Two Lists	Java	Explanation	Easy
☐	600	Non-negative Integers without Consecutive Ones	Java	Explanation	Hard
☐	604	Design Compressed String Iterator	Java	Explanation	Easy
☐	605	Can Place Flowers	Java	Explanation	Easy
☐	606	Construct String from Binary Tree	Java	Explanation	Easy
☐	609	Find Duplicate File in System	Java	Explanation	Medium
☐	611	Valid Triangle Number	Java	Explanation	Medium
☐	616	Add Bold Tag in String	Java	Explanation	Medium
☐	617	Merge Two Binary Trees	Java	Explanation	Easy
☐	621	Task Scheduler	Java	Explanation	Medium
☐	622	Design Circular Queue	Java	Explanation	Medium
☐	623	Add One Row to Tree	Java	Explanation	Medium
☐	624	Maximum Distance in Arrays	Java	Explanation	Easy
☐	625	Minimum Factorization	Java	Explanation	Medium
☐	628	Maximum Product of Three Numbers	Java	Explanation	Easy
☐	629	K Inverse Pairs Array	Java	Explanation	Hard
☐	630	Course Schedule III	Java	Explanation	Hard
☐	631	Design Excel Sum Formula	Java	Explanation	Hard
☐	632	Smallest Range Covering Elements from K Lists	Java	Explanation	Hard
☐	633	Sum of Square Numbers	Java	Explanation	Easy
☐	634	Find the Derangement of An Array	Java	Explanation	Medium
☐	635	Design Log Storage System	Java	Explanation	Medium
☐	636	Exclusive Time of Functions	Java	Explanation	Medium
☐	637	Average of Levels in Binary Tree	Java	Explanation	Easy
☐	638	Shopping Offers	Java	Explanation	Medium
☐	639	Decode Ways II	Java	Explanation	Hard
☐	640	Solve the Equation	Java	Explanation	Medium
☐	641	Design Circular Deque	Java	Explanation	Medium
☐	642	Design Search Autocomplete System	Java	Explanation	Hard
☐	643	Maximum Average Subarray I	Java	Explanation	Easy
☐	644	Maximum Average Subarray II	Java	Explanation	Hard
☐	645	Set Mismatch	Java	Explanation	Easy
☐	646	Maximum Length of Pair Chain	Java	Explanation	Medium
☐	647	Palindromic Substrings	Java	Explanation	Medium
☐	648	Replace Words	Java	Explanation	Medium
☐	649	Dota2 Senate	Java	Explanation	Medium
☐	650	2 Keys Keyboard	Java	Explanation	Medium
☐	651	4 Keys Keyboard	Java	Explanation	Medium
☐	652	Find Duplicate Subtrees	Java	Explanation	Medium
☐	653	Two Sum IV - Input is a BST	Java	Explanation	Easy
☐	654	Maximum Binary Tree	Java	Explanation	Medium
☐	655	Print Binary Tree	Java	Explanation	Medium
☐	656	Coin Path	Java	Explanation	Hard
☐	657	Robot Return to Origin	Java	Explanation	Easy
☐	658	Find K Closest Elements	Java	Explanation	Medium
☐	659	Split Array into Consecutive Subsequences	Java	Explanation	Medium
☐	660	Remove 9	Java	Explanation	Hard
☐	661	Image Smoother	Java	Explanation	Easy
☐	662	Maximum Width of Binary Tree	Java	Explanation	Medium
☐	663	Equal Tree Partition	Java	Explanation	Medium
☐	664	Strange Printer	Java	Explanation	Hard
☐	665	Non-decreasing Array	Java	Explanation	Easy
☐	666	Path Sum IV	Java	Explanation	Medium
☐	667	Beautiful Arrangement II	Java	Explanation	Medium
☐	668	Kth Smallest Number in Multiplication Table	Java	Explanation	Hard
☐	669	Trim a Binary Search Tree	Java	Explanation	Easy
☐	670	Maximum Swap	Java	Explanation	Medium
☐	671	Second Minimum Node In a Binary Tree	Java	Explanation	Easy
☐	672	Bulb Switcher II	Java	Explanation	Medium
☐	673	Number of Longest Increasing Subsequence	Java	Explanation	Medium
☐	674	Longest Continuous Increasing Subsequence	Java	Explanation	Easy
☐	675	Cut Off Trees for Golf Event	Java	Explanation	Hard
☐	676	Implement Magic Dictionary	Java	Explanation	Medium
☐	677	Map Sum Pairs	Java	Explanation	Medium
☐	678	Valid Parenthesis String	Java	Explanation	Medium
☐	679	24 Game	Java	Explanation	Hard
☐	680	Valid Palindrome II	Java	Explanation	Easy
☐	681	Next Closest Time	Java	Explanation	Medium
☐	682	Baseball Game	Java	Explanation	Easy
☐	683	K Empty Slots	Java	Explanation	Hard
☐	684	Redundant Connection	Java	Explanation	Medium
☐	685	Redundant Connection II	Java	Explanation	Hard
☐	686	Repeated String Match	Java	Explanation	Easy
☐	687	Longest Univalue Path	Java	Explanation	Easy
☐	688	Knight Probability in Chessboard	Java	Explanation	Medium
☐	689	Maximum Sum of 3 Non-Overlapping Subarrays	Java	Explanation	Hard
☐	690	Employee Importance	Java	Explanation	Easy
☐	691	Stickers to Spell Word	Java	Explanation	Hard
☐	692	Top K Frequent Words	Java	Explanation	Medium
☐	693	Binary Number with Alternating Bits	Java	Explanation	Easy
☐	694	Number of Distinct Islands	Java	Explanation	Medium
☐	695	Max Area of Island	Java	Explanation	Medium
☐	696	Count Binary Substrings	Java	Explanation	Easy
☐	697	Degree of an Array	Java	Explanation	Easy
☐	698	Partition to K Equal Sum Subsets	Java	Explanation	Medium
☐	699	Falling Squares	Java	Explanation	Hard
☐	700	Search in a Binary Search Tree	Java	Explanation	Easy
☐	701	Insert into a Binary Search Tree	Java	Explanation	Medium
☐	702	Search in a Sorted Array of Unknown Size	Java	Explanation	Medium
☐	703	Kth Largest Element in a Stream	Java	Explanation	Easy
☐	704	Binary Search	Java	Explanation	Easy
☐	705	Design HashSet	Java	Explanation	Easy
☐	706	Design HashMap	Java	Explanation	Easy
☐	707	Design Linked List	Java	Explanation	Easy
☐	708	Insert into a Cyclic Sorted List	Java	Explanation	Medium
☐	709	To Lower Case	Java	Explanation	Easy
☐	710	Random Pick with Blacklist	Java	Explanation	Hard
☐	711	Number of Distinct Islands II	Java	Explanation	Hard
☐	712	Minimum ASCII Delete Sum for Two Strings	Java	Explanation	Medium
☐	713	Subarray Product Less Than K	Java	Explanation	Medium
☐	714	Best Time to Buy and Sell Stock with Transaction Fee	Java	Explanation	Medium
☐	715	Range Module	Java	Explanation	Hard
☐	716	Max Stack	Java	Explanation	Easy
☐	717	1-bit and 2-bit Characters	Java	Explanation	Easy
☐	718	Maximum Length of Repeated Subarray	Java	Explanation	Medium
☐	719	Find K-th Smallest Pair Distance	Java	Explanation	Hard
☐	720	Longest Word in Dictionary	Java	Explanation	Easy
☐	721	Accounts Merge	Java	Explanation	Medium
☐	722	Remove Comments	Java	Explanation	Medium
☐	723	Candy Crush	Java	Explanation	Medium
☐	724	Find Pivot Index	Java	Explanation	Easy
☐	725	Split Linked List in Parts	Java	Explanation	Medium
☐	726	Number of Atoms	Java	Explanation	Hard
☐	727	Minimum Window Subsequence	Java	Explanation	Hard
☐	728	Self Dividing Numbers	Java	Explanation	Easy
☐	729	My Calendar I	Java	Explanation	Medium
☐	730	Count Different Palindromic Subsequences	Java	Explanation	Hard
☐	731	My Calendar II	Java	Explanation	Medium
☐	732	My Calendar III	Java	Explanation	Hard
☐	733	Flood Fill	Java	Explanation	Easy
☐	734	Sentence Similarity	Java	Explanation	Easy
☐	735	Asteroid Collision	Java	Explanation	Medium
☐	736	Parse Lisp Expression	Java	Explanation	Hard
☐	737	Sentence Similarity II	Java	Explanation	Medium
☐	738	Monotone Increasing Digits	Java	Explanation	Medium
☐	739	Daily Temperatures	Java	Explanation	Medium
☐	740	Delete and Earn	Java	Explanation	Medium
☐	741	Cherry Pickup	Java	Explanation	Hard
☐	742	Closest Leaf in a Binary Tree	Java	Explanation	Medium
☐	743	Network Delay Time	Java	Explanation	Medium
☐	744	Find Smallest Letter Greater Than Target	Java	Explanation	Easy
☐	745	Prefix and Suffix Search	Java	Explanation	Hard
☐	746	Min Cost Climbing Stairs	Java	Explanation	Easy
☐	747	Largest Number At Least Twice of Others	Java	Explanation	Easy
☐	748	Shortest Completing Word	Java	Explanation	Easy
☐	749	Contain Virus	Java	Explanation	Hard
☐	750	Number Of Corner Rectangles	Java	Explanation	Medium
☐	751	IP to CIDR	Java	Explanation	Easy
☐	752	Open the Lock	Java	Explanation	Medium
☐	753	Cracking the Safe	Java	Explanation	Hard
☐	754	Reach a Number	Java	Explanation	Easy
☐	755	Pour Water	Java	Explanation	Medium
☐	756	Pyramid Transition Matrix	Java	Explanation	Medium
☐	757	Set Intersection Size At Least Two	Java	Explanation	Hard
☐	758	Bold Words in String	Java	Explanation	Easy
☐	759	Employee Free Time	Java	Explanation	Hard
☐	760	Find Anagram Mappings	Java	Explanation	Easy
☐	761	Special Binary String	Java	Explanation	Hard
☐	762	Prime Number of Set Bits in Binary Representation	Java	Explanation	Easy
☐	763	Partition Labels	Java	Explanation	Medium
☐	764	Largest Plus Sign	Java	Explanation	Medium
☐	765	Couples Holding Hands	Java	Explanation	Hard
☐	766	Toeplitz Matrix	Java	Explanation	Easy
☐	767	Reorganize String	Java	Explanation	Medium
☐	768	Max Chunks To Make Sorted II	Java	Explanation	Hard
☐	769	Max Chunks To Make Sorted	Java	Explanation	Medium
☐	770	Basic Calculator IV	Java	Explanation	Hard
☐	771	Jewels and Stones	Java	Explanation	Easy
☐	772	Basic Calculator III	Java	Explanation	Hard
☐	773	Sliding Puzzle	Java	Explanation	Hard
☐	774	Minimize Max Distance to Gas Station	Java	Explanation	Hard
☐	775	Global and Local Inversions	Java	Explanation	Medium
☐	776	Split BST	Java	Explanation	Medium
☐	777	Swap Adjacent in LR String	Java	Explanation	Medium
☐	778	Swim in Rising Water	Java	Explanation	Hard
☐	779	K-th Symbol in Grammar	Java	Explanation	Medium
☐	780	Reaching Points	Java	Explanation	Hard
☐	781	Rabbits in Forest	Java	Explanation	Medium
☐	782	Transform to Chessboard	Java	Explanation	Hard
☐	783	Minimum Distance Between BST Nodes	Java	Explanation	Easy
☐	784	Letter Case Permutation	Java	Explanation	Easy
☐	785	Is Graph Bipartite?	Java	Explanation	Medium
☐	786	K-th Smallest Prime Fraction	Java	Explanation	Hard
☐	787	Cheapest Flights Within K Stops	Java	Explanation	Medium
☐	788	Rotated Digits	Java	Explanation	Easy
☐	789	Escape The Ghosts	Java	Explanation	Medium
☐	790	Domino and Tromino Tiling	Java	Explanation	Medium
☐	791	Custom Sort String	Java	Explanation	Medium
☐	792	Number of Matching Subsequences	Java	Explanation	Medium
☐	793	Preimage Size of Factorial Zeroes Function	Java	Explanation	Hard
☐	794	Valid Tic-Tac-Toe State	Java	Explanation	Medium
☐	795	Number of Subarrays with Bounded Maximum	Java	Explanation	Medium
☐	796	Rotate String	Java	Explanation	Easy
☐	797	All Paths From Source to Target	Java	Explanation	Medium
☐	798	Smallest Rotation with Highest Score	Java	Explanation	Hard
☐	799	Champagne Tower	Java	Explanation	Medium
☐	800	Similar RGB Color	Java	Explanation	Easy
☐	801	Minimum Swaps To Make Sequences Increasing	Java	Explanation	Medium
☐	802	Find Eventual Safe States	Java	Explanation	Medium
☐	803	Bricks Falling When Hit	Java	Explanation	Hard
☐	804	Unique Morse Code Words	Java	Explanation	Easy
☐	805	Split Array With Same Average	Java	Explanation	Hard
☐	806	Number of Lines To Write String	Java	Explanation	Easy
☐	807	Max Increase to Keep City Skyline	Java	Explanation	Medium
☐	808	Soup Servings	Java	Explanation	Medium
☐	809	Expressive Words	Java	Explanation	Medium
☐	810	Chalkboard XOR Game	Java	Explanation	Hard
☐	811	Subdomain Visit Count	Java	Explanation	Easy
☐	812	Largest Triangle Area	Java	Explanation	Easy
☐	813	Largest Sum of Averages	Java	Explanation	Medium
☐	814	Binary Tree Pruning	Java	Explanation	Medium
☐	815	Bus Routes	Java	Explanation	Hard
☐	816	Ambiguous Coordinates	Java	Explanation	Medium
☐	817	Linked List Components	Java	Explanation	Medium
☐	818	Race Car	Java	Explanation	Hard
☐	819	Most Common Word	Java	Explanation	Easy
☐	820	Short Encoding of Words	Java	Explanation	Medium
☐	821	Shortest Distance to a Character	Java	Explanation	Easy
☐	822	Card Flipping Game	Java	Explanation	Medium
☐	823	Binary Trees With Factors	Java	Explanation	Medium
☐	824	Goat Latin	Java	Explanation	Easy
☐	825	Friends Of Appropriate Ages	Java	Explanation	Medium
☐	826	Most Profit Assigning Work	Java	Explanation	Medium
☐	827	Making A Large Island	Java	Explanation	Hard
☐	828	Unique Letter String	Java	Explanation	Hard
☐	829	Consecutive Numbers Sum	Java	Explanation	Hard
☐	830	Positions of Large Groups	Java	Explanation	Easy
☐	831	Masking Personal Information	Java	Explanation	Medium
☐	832	Flipping an Image	Java	Explanation	Easy
☐	833	Find And Replace in String	Java	Explanation	Medium
☐	834	Sum of Distances in Tree	Java	Explanation	Hard
☐	835	Image Overlap	Java	Explanation	Medium
☐	836	Rectangle Overlap	Java	Explanation	Easy
☐	837	New 21 Game	Java	Explanation	Medium
☐	838	Push Dominoes	Java	Explanation	Medium
☐	839	Similar String Groups	Java	Explanation	Hard
☐	840	Magic Squares In Grid	Java	Explanation	Easy
☐	841	Keys and Rooms	Java	Explanation	Medium
☐	842	Split Array into Fibonacci Sequence	Java	Explanation	Medium
☐	843	Guess the Word	Java	Explanation	Hard
☐	844	Backspace String Compare	Java	Explanation	Easy
☐	845	Longest Mountain in Array	Java	Explanation	Medium
☐	846	Hand of Straights	Java	Explanation	Medium
☐	847	Shortest Path Visiting All Nodes	Java	Explanation	Hard
☐	848	Shifting Letters	Java	Explanation	Medium
☐	849	Maximize Distance to Closest Person	Java	Explanation	Easy
☐	850	Rectangle Area II	Java	Explanation	Hard
☐	851	Loud and Rich	Java	Explanation	Medium
☐	852	Peak Index in a Mountain Array	Java	Explanation	Easy
☐	853	Car Fleet	Java	Explanation	Medium
☐	854	K-Similar Strings	Java	Explanation	Hard
☐	855	Exam Room	Java	Explanation	Medium
☐	856	Score of Parentheses	Java	Explanation	Medium
☐	857	Minimum Cost to Hire K Workers	Java	Explanation	Hard
☐	858	Mirror Reflection	Java	Explanation	Medium
☐	859	Buddy Strings	Java	Explanation	Easy
☐	860	Lemonade Change	Java	Explanation	Easy
☐	861	Score After Flipping Matrix	Java	Explanation	Medium
☐	862	Shortest Subarray with Sum at Least K	Java	Explanation	Hard
☐	863	All Nodes Distance K in Binary Tree	Java	Explanation	Medium
☐	864	Shortest Path to Get All Keys	Java	Explanation	Hard
☐	865	Smallest Subtree with all the Deepest Nodes	Java	Explanation	Medium
☐	866	Prime Palindrome	Java	Explanation	Medium
☐	867	Transpose Matrix	Java	Explanation	Easy
☐	868	Binary Gap	Java	Explanation	Easy
☐	869	Reordered Power of 2	Java	Explanation	Medium
☐	870	Advantage Shuffle	Java	Explanation	Medium
☐	871	Minimum Number of Refueling Stops	Java	Explanation	Hard
☐	872	Leaf-Similar Trees	Java	Explanation	Easy
☐	873	Length of Longest Fibonacci Subsequence	Java	Explanation	Medium
☐	874	Walking Robot Simulation	Java	Explanation	Easy
☐	875	Koko Eating Bananas	Java	Explanation	Medium
☐	876	Middle of the Linked List	Java	Explanation	Easy
☐	877	Stone Game	Java	Explanation	Medium
☐	878	Nth Magical Number	Java	Explanation	Hard
☐	879	Profitable Schemes	Java	Explanation	Hard
☐	880	Decoded String at Index	Java	Explanation	Medium
☐	881	Boats to Save People	Java	Explanation	Medium
☐	882	Reachable Nodes In Subdivided Graph	Java	Explanation	Hard
☐	883	Projection Area of 3D Shapes	Java	Explanation	Easy
☐	884	Uncommon Words from Two Sentences	Java	Explanation	Easy
☐	885	Spiral Matrix III	Java	Explanation	Medium
☐	886	Possible Bipartition	Java	Explanation	Medium
☐	887	Super Egg Drop	Java	Explanation	Hard
☐	888	Fair Candy Swap	Java	Explanation	Easy
☐	889	Construct Binary Tree from Preorder and Postorder Traversal	Java	Explanation	Medium
☐	890	Find and Replace Pattern	Java	Explanation	Medium
☐	891	Sum of Subsequence Widths	Java	Explanation	Hard
☐	892	Surface Area of 3D Shapes	Java	Explanation	Easy
☐	893	Groups of Special-Equivalent Strings	Java	Explanation	Easy
☐	894	All Possible Full Binary Trees	Java	Explanation	Medium
☐	895	Maximum Frequency Stack	Java	Explanation	Hard
☐	896	Monotonic Array	Java	Explanation	Easy
☐	897	Increasing Order Search Tree	Java	Explanation	Easy
☐	898	Bitwise ORs of Subarrays	Java	Explanation	Medium
☐	899	Orderly Queue	Java	Explanation	Hard
☐	900	RLE Iterator	Java	Explanation	Medium
☐	901	Online Stock Span	Java	Explanation	Medium
☐	902	Numbers At Most N Given Digit Set	Java	Explanation	Hard
☐	903	Valid Permutations for DI Sequence	Java	Explanation	Hard
☐	904	Fruit Into Baskets	Java	Explanation	Medium
☐	905	Sort Array By Parity	Java	Explanation	Easy
☐	906	Super Palindromes	Java	Explanation	Hard
☐	907	Sum of Subarray Minimums	Java	Explanation	Medium
☐	908	Smallest Range I	Java	Explanation	Easy
☐	909	Snakes and Ladders	Java	Explanation	Medium
☐	910	Smallest Range II	Java	Explanation	Medium
☐	911	Online Election	Java	Explanation	Medium
☐	912	Sort an Array	Java	Explanation	Medium
☐	913	Cat and Mouse	Java	Explanation	Hard
☐	914	X of a Kind in a Deck of Cards	Java	Explanation	Easy
☐	915	Partition Array into Disjoint Intervals	Java	Explanation	Medium
☐	916	Word Subsets	Java	Explanation	Medium
☐	917	Reverse Only Letters	Java	Explanation	Easy
☐	918	Maximum Sum Circular Subarray	Java	Explanation	Medium
☐	919	Complete Binary Tree Inserter	Java	Explanation	Medium
☐	920	Number of Music Playlists	Java	Explanation	Hard
☐	921	Minimum Add to Make Parentheses Valid	Java	Explanation	Medium
☐	922	Sort Array By Parity II	Java	Explanation	Easy
☐	923	3Sum With Multiplicity	Java	Explanation	Medium
☐	924	Minimize Malware Spread	Java	Explanation	Hard
☐	925	Long Pressed Name	Java	Explanation	Easy
☐	926	Flip String to Monotone Increasing	Java	Explanation	Medium
☐	927	Three Equal Parts	Java	Explanation	Hard
☐	928	Minimize Malware Spread II	Java	Explanation	Hard
☐	929	Unique Email Addresses	Java	Explanation	Easy
☐	930	Binary Subarrays With Sum	Java	Explanation	Medium
☐	931	Minimum Falling Path Sum	Java	Explanation	Medium
☐	932	Beautiful Array	Java	Explanation	Medium
☐	933	Number of Recent Calls	Java	Explanation	Easy
☐	934	Shortest Bridge	Java	Explanation	Medium
☐	935	Knight Dialer	Java	Explanation	Medium
☐	936	Stamping The Sequence	Java	Explanation	Hard
☐	937	Reorder Data in Log Files	Java	Explanation	Easy
☐	938	Range Sum of BST	Java	Explanation	Easy
☐	939	Minimum Area Rectangle	Java	Explanation	Medium
☐	940	Distinct Subsequences II	Java	Explanation	Hard
☐	941	Valid Mountain Array	Java	Explanation	Easy
☐	942	DI String Match	Java	Explanation	Easy
☐	943	Find the Shortest Superstring	Java	Explanation	Hard
☐	944	Delete Columns to Make Sorted	Java	Explanation	Easy
☐	945	Minimum Increment to Make Array Unique	Java	Explanation	Medium
☐	946	Validate Stack Sequences	Java	Explanation	Medium
☐	947	Most Stones Removed with Same Row or Column	Java	Explanation	Medium
☐	948	Bag of Tokens	Java	Explanation	Medium
☐	949	Largest Time for Given Digits	Java	Explanation	Easy
☐	950	Reveal Cards In Increasing Order	Java	Explanation	Medium
☐	951	Flip Equivalent Binary Trees	Java	Explanation	Medium
☐	952	Largest Component Size by Common Factor	Java	Explanation	Hard
☐	953	Verifying an Alien Dictionary	Java	Explanation	Easy
☐	954	Array of Doubled Pairs	Java	Explanation	Medium
☐	955	Delete Columns to Make Sorted II	Java	Explanation	Medium
☐	956	Tallest Billboard	Java	Explanation	Hard
☐	957	Prison Cells After N Days	Java	Explanation	Medium
☐	958	Check Completeness of a Binary Tree	Java	Explanation	Medium
☐	959	Regions Cut By Slashes	Java	Explanation	Medium
☐	960	Delete Columns to Make Sorted III	Java	Explanation	Hard
☐	961	N-Repeated Element in Size 2N Array	Java	Explanation	Easy
☐	962	Maximum Width Ramp	Java	Explanation	Medium
☐	963	Minimum Area Rectangle II	Java	Explanation	Medium
☐	964	Least Operators to Express Number	Java	Explanation	Hard
☐	965	Univalued Binary Tree	Java	Explanation	Easy
☐	966	Vowel Spellchecker	Java	Explanation	Medium
☐	967	Numbers With Same Consecutive Differences	Java	Explanation	Medium
☐	968	Binary Tree Cameras	Java	Explanation	Hard
☐	969	Pancake Sorting	Java	Explanation	Medium
☐	970	Powerful Integers	Java	Explanation	Easy
☐	971	Flip Binary Tree To Match Preorder Traversal	Java	Explanation	Medium
☐	972	Equal Rational Numbers	Java	Explanation	Hard
☐	973	K Closest Points to Origin	Java	Explanation	Medium
☐	974	Subarray Sums Divisible by K	Java	Explanation	Medium
☐	975	Odd Even Jump	Java	Explanation	Hard
☐	976	Largest Perimeter Triangle	Java	Explanation	Easy
☐	977	Squares of a Sorted Array	Java	Explanation	Easy
☐	978	Longest Turbulent Subarray	Java	Explanation	Medium
☐	979	Distribute Coins in Binary Tree	Java	Explanation	Medium
☐	980	Unique Paths III	Java	Explanation	Hard
☐	981	Time Based Key-Value Store	Java	Explanation	Medium
☐	982	Triples with Bitwise AND Equal To Zero	Java	Explanation	Hard
☐	983	Minimum Cost For Tickets	Java	Explanation	Medium
☐	984	String Without AAA or BBB	Java	Explanation	Medium
☐	985	Sum of Even Numbers After Queries	Java	Explanation	Easy
☐	986	Interval List Intersections	Java	Explanation	Medium
☐	987	Vertical Order Traversal of a Binary Tree	Java	Explanation	Medium
☐	988	Smallest String Starting From Leaf	Java	Explanation	Medium
☐	989	Add to Array-Form of Integer	Java	Explanation	Easy
☐	990	Satisfiability of Equality Equations	Java	Explanation	Medium
☐	991	Broken Calculator	Java	Explanation	Medium
☐	992	Subarrays with K Different Integers	Java	Explanation	Hard
☐	993	Cousins in Binary Tree	Java	Explanation	Easy
☐	994	Rotting Oranges	Java	Explanation	Easy
☐	995	Minimum Number of K Consecutive Bit Flips	Java	Explanation	Hard
☐	996	Number of Squareful Arrays	Java	Explanation	Hard
☐	997	Find the Town Judge	Java	Explanation	Easy
☐	998	Maximum Binary Tree II	Java	Explanation	Medium
☐	999	Available Captures for Rook	Java	Explanation	Easy
☐	1000	Minimum Cost to Merge Stones	Java	Explanation	Hard
☐	1001	Grid Illumination	Java	Explanation	Hard
☐	1002	Find Common Characters	Java	Explanation	Easy
☐	1003	Check If Word Is Valid After Substitutions	Java	Explanation	Medium
☐	1004	Max Consecutive Ones III	Java	Explanation	Medium
☐	1005	Maximize Sum Of Array After K Negations	Java	Explanation	Easy
☐	1006	Clumsy Factorial	Java	Explanation	Medium
☐	1007	Minimum Domino Rotations For Equal Row	Java	Explanation	Medium
☐	1008	Construct Binary Search Tree from Preorder Traversal	Java	Explanation	Medium
☐	1009	Complement of Base 10 Integer	Java	Explanation	Easy
☐	1010	Pairs of Songs With Total Durations Divisible by 60	Java	Explanation	Easy
☐	1011	Capacity To Ship Packages Within D Days	Java	Explanation	Medium
☐	1012	Numbers With Repeated Digits	Java	Explanation	Hard
☐	1013	Partition Array Into Three Parts With Equal Sum	Java	Explanation	Easy
☐	1014	Best Sightseeing Pair	Java	Explanation	Medium
☐	1015	Smallest Integer Divisible by K	Java	Explanation	Medium
☐	1016	Binary String With Substrings Representing 1 To N	Java	Explanation	Medium
☐	1017	Convert to Base -2	Java	Explanation	Medium
☐	1018	Binary Prefix Divisible By 5	Java	Explanation	Easy
☐	1019	Next Greater Node In Linked List	Java	Explanation	Medium
☐	1020	Number of Enclaves	Java	Explanation	Medium
☐	1021	Remove Outermost Parentheses	Java	Explanation	Easy
☐	1022	Sum of Root To Leaf Binary Numbers	Java	Explanation	Easy
☐	1023	Camelcase Matching	Java	Explanation	Medium
☐	1024	Video Stitching	Java	Explanation	Medium
☐	1025	Divisor Game	Java	Explanation	Easy
☐	1026	Maximum Difference Between Node and Ancestor	Java	Explanation	Medium
☐	1027	Longest Arithmetic Sequence	Java	Explanation	Medium
☐	1028	Recover a Tree From Preorder Traversal	Java	Explanation	Hard
☐	1029	Two City Scheduling	Java	Explanation	Easy
☐	1030	Matrix Cells in Distance Order	Java	Explanation	Easy
☐	1031	Maximum Sum of Two Non-Overlapping Subarrays	Java	Explanation	Medium
☐	1032	Stream of Characters	Java	Explanation	Hard
☐	1033	Moving Stones Until Consecutive	Java	Explanation	Easy
☐	1034	Coloring A Border	Java	Explanation	Medium
☐	1035	Uncrossed Lines	Java	Explanation	Medium
☐	1036	Escape a Large Maze	Java	Explanation	Hard
☐	1037	Valid Boomerang	Java	Explanation	Easy
☐	1038	Binary Search Tree to Greater Sum Tree	Java	Explanation	Medium
☐	1039	Minimum Score Triangulation of Polygon	Java	Explanation	Medium
☐	1040	Moving Stones Until Consecutive II	Java	Explanation	Medium
☐	1041	Robot Bounded In Circle	Java	Explanation	Medium
☐	1042	Flower Planting With No Adjacent	Java	Explanation	Easy
☐	1043	Partition Array for Maximum Sum	Java	Explanation	Medium
☐	1044	Longest Duplicate Substring	Java	Explanation	Hard
☐	1046	Last Stone Weight	Java	Explanation	Easy
☐	1047	Remove All Adjacent Duplicates In String	Java	Explanation	Easy
☐	1048	Longest String Chain	Java	Explanation	Medium
☐	1049	Last Stone Weight II	Java	Explanation	Medium
☐	1051	Height Checker	Java	Explanation	Easy
☐	1052	Grumpy Bookstore Owner	Java	Explanation	Medium
☐	1053	Previous Permutation With One Swap	Java	Explanation	Medium
☐	1054	Distant Barcodes	Java	Explanation	Medium
☐	1055	Shortest Way to Form String	Java	Explanation	Medium
☐	1056	Confusing Number	Java	Explanation	Easy
☐	1057	Campus Bikes	Java	Explanation	Medium
☐	1058	Minimize Rounding Error to Meet Target	Java	Explanation	Medium
☐	1059	All Paths from Source Lead to Destination	Java	Explanation	Medium
☐	1060	Missing Element in Sorted Array	Java	Explanation	Medium
☐	1061	Lexicographically Smallest Equivalent String	Java	Explanation	Medium
☐	1062	Longest Repeating Substring	Java	Explanation	Medium
☐	1063	Number of Valid Subarrays	Java	Explanation	Hard
☐	1064	Fixed Point	Java	Explanation	Easy
☐	1065	Index Pairs of a String	Java	Explanation	Easy
☐	1066	Campus Bikes II	Java	Explanation	Medium
☐	1067	Digit Count in Range	Java	Explanation	Hard
☐	1071	Greatest Common Divisor of Strings	Java	Explanation	Easy
☐	1072	Flip Columns For Maximum Number of Equal Rows	Java	Explanation	Medium
☐	1073	Adding Two Negabinary Numbers	Java	Explanation	Medium
☐	1074	Number of Submatrices That Sum to Target	Java	Explanation	Hard
☐	1078	Occurrences After Bigram	Java	Explanation	Easy
☐	1079	Letter Tile Possibilities	Java	Explanation	Medium
☐	1080	Insufficient Nodes in Root to Leaf Paths	Java	Explanation	Medium
☐	1081	Smallest Subsequence of Distinct Characters	Java	Explanation	Medium
☐	1085	Sum of Digits in the Minimum Number	Java	Explanation	Easy
☐	1086	High Five	Java	Explanation	Easy
☐	1087	Brace Expansion	Java	Explanation	Medium
☐	1088	Confusing Number II	Java	Explanation	Hard
☐	1089	Duplicate Zeros	Java	Explanation	Easy
☐	1090	Largest Values From Labels	Java	Explanation	Medium
☐	1091	Shortest Path in Binary Matrix	Java	Explanation	Medium
☐	1092	Shortest Common Supersequence	Java	Explanation	Hard
☐	1093	Statistics from a Large Sample	Java	Explanation	Medium
☐	1094	Car Pooling	Java	Explanation	Medium
☐	1095	Find in Mountain Array	Java	Explanation	Hard
☐	1096	Brace Expansion II	Java	Explanation	Hard
☐	1099	Two Sum Less Than K	Java	Explanation	Easy
☐	1100	Find K-Length Substrings With No Repeated Characters	Java	Explanation	Medium
☐	1101	The Earliest Moment When Everyone Become Friends	Java	Explanation	Medium
☐	1102	Path With Maximum Minimum Value	Java	Explanation	Medium
☐	1103	Distribute Candies to People	Java	Explanation	Easy
☐	1104	Path In Zigzag Labelled Binary Tree	Java	Explanation	Medium
☐	1105	Filling Bookcase Shelves	Java	Explanation	Medium
☐	1106	Parsing A Boolean Expression	Java	Explanation	Hard
☐	1108	Defanging an IP Address	Java	Explanation	Easy
☐	1109	Corporate Flight Bookings	Java	Explanation	Medium
☐	1110	Delete Nodes And Return Forest	Java	Explanation	Medium
☐	1111	Maximum Nesting Depth of Two Valid Parentheses Strings	Java	Explanation	Medium
☐	1118	Number of Days in a Month	Java	Explanation	Easy
☐	1119	Remove Vowels from a String	Java	Explanation	Easy
☐	1120	Maximum Average Subtree	Java	Explanation	Medium
☐	1121	Divide Array Into Increasing Sequences	Java	Explanation	Hard
☐	1122	Relative Sort Array	Java	Explanation	Easy
☐	1123	Lowest Common Ancestor of Deepest Leaves	Java	Explanation	Medium
☐	1124	Longest Well-Performing Interval	Java	Explanation	Medium
☐	1125	Smallest Sufficient Team	Java	Explanation	Hard
☐	1128	Number of Equivalent Domino Pairs	Java	Explanation	Easy
☐	1129	Shortest Path with Alternating Colors	Java	Explanation	Medium
☐	1130	Minimum Cost Tree From Leaf Values	Java	Explanation	Medium
☐	1131	Maximum of Absolute Value Expression	Java	Explanation	Medium
☐	1133	Largest Unique Number	Java	Explanation	Easy
☐	1134	Armstrong Number	Java	Explanation	Easy
☐	1135	Connecting Cities With Minimum Cost	Java	Explanation	Medium
☐	1136	Parallel Courses	Java	Explanation	Hard
☐	1137	N-th Tribonacci Number	Java	Explanation	Easy
☐	1138	Alphabet Board Path	Java	Explanation	Medium
☐	1139	Largest 1-Bordered Square	Java	Explanation	Medium
☐	1140	Stone Game II	Java	Explanation	Medium
☐	1143	Longest Common Subsequence	Java	Explanation	Medium
☐	1144	Decrease Elements To Make Array Zigzag	Java	Explanation	Medium
☐	1145	Binary Tree Coloring Game	Java	Explanation	Medium
☐	1146	Snapshot Array	Java	Explanation	Medium
☐	1147	Longest Chunked Palindrome Decomposition	Java	Explanation	Hard
☐	1150	Check If a Number Is Majority Element in a Sorted Array	Java	Explanation	Easy
☐	1151	Minimum Swaps to Group All 1’s Together	Java	Explanation	Medium
☐	1152	Analyze User Website Visit Pattern	Java	Explanation	Medium
☐	1153	String Transforms Into Another String	Java	Explanation	Hard
☐	1154	Day of the Year	Java	Explanation	Easy
☐	1155	Number of Dice Rolls With Target Sum	Java	Explanation	Medium
☐	1156	Swap For Longest Repeated Character Substring	Java	Explanation	Medium
☐	1157	Online Majority Element In Subarray	Java	Explanation	Hard
☐	1160	Find Words That Can Be Formed by Characters	Java	Explanation	Easy
☐	1161	Maximum Level Sum of a Binary Tree	Java	Explanation	Medium
☐	1162	As Far from Land as Possible	Java	Explanation	Medium
☐	1163	Last Substring in Lexicographical Order	Java	Explanation	Hard
☐	1165	Single-Row Keyboard	Java	Explanation	Easy
☐	1166	Design File System	Java	Explanation	Medium
☐	1167	Minimum Cost to Connect Sticks	Java	Explanation	Medium
☐	1168	Optimize Water Distribution in a Village	Java	Explanation	Hard
☐	1169	Invalid Transactions	Java	Explanation	Medium
☐	1170	Compare Strings by Frequency of the Smallest Character	Java	Explanation	Easy
☐	1171	Remove Zero Sum Consecutive Nodes from Linked List	Java	Explanation	Medium
☐	1172	Dinner Plate Stacks	Java	Explanation	Hard
☐	1175	Prime Arrangements	Java	Explanation	Easy
☐	1176	Diet Plan Performance	Java	Explanation	Easy
☐	1177	Can Make Palindrome from Substring	Java	Explanation	Medium
☐	1178	Number of Valid Words for Each Puzzle	Java	Explanation	Hard
☐	1180	Count Substrings with Only One Distinct Letter	Java	Explanation	Easy
☐	1181	Before and After Puzzle	Java	Explanation	Medium
☐	1182	Shortest Distance to Target Color	Java	Explanation	Medium
☐	1183	Maximum Number of Ones	Java	Explanation	Hard
☐	1184	Distance Between Bus Stops	Java	Explanation	Easy
☐	1185	Day of the Week	Java	Explanation	Easy
☐	1186	Maximum Subarray Sum with One Deletion	Java	Explanation	Medium
☐	1187	Make Array Strictly Increasing	Java	Explanation	Hard
☐	1189	Maximum Number of Balloons	Java	Explanation	Easy
☐	1190	Reverse Substrings Between Each Pair of Parentheses	Java	Explanation	Medium
☐	1191	K-Concatenation Maximum Sum	Java	Explanation	Medium
☐	1192	Critical Connections in a Network	Java	Explanation	Hard
☐	1196	How Many Apples Can You Put into the Basket	Java	Explanation	Easy
☐	1197	Minimum Knight Moves	Java	Explanation	Medium
☐	1198	Find Smallest Common Element in All Rows	Java	Explanation	Medium
☐	1199	Minimum Time to Build Blocks	Java	Explanation	Hard
☐	1200	Minimum Absolute Difference	Java	Explanation	Easy
☐	1201	Ugly Number III	Java	Explanation	Medium
☐	1202	Smallest String With Swaps	Java	Explanation	Medium
☐	1203	Sort Items by Groups Respecting Dependencies	Java	Explanation	Hard
☐	1206	Design Skiplist New	Java	Explanation	Hard
☐	1207	Unique Number of Occurrences	Java	Explanation	Easy
☐	1208	Get Equal Substrings Within Budget	Java	Explanation	Medium
☐	1209	Remove All Adjacent Duplicates in String II	Java	Explanation	Medium
☐	1210	Minimum Moves to Reach Target with Rotations	Java	Explanation	Hard

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