Hard LeetCode-Java-Solutions

S.no	Coding Problem
1	Concatenated Words
2	Minimum Cost to Make Array Equal
3	Max Stack
4	Course Schedule III
5	Binary Tree Cameras
6	Remove Invalid Parentheses
7	First Missing Positive
8	Reconstruct Itinerary
9	Frog Jump
10	Sort Items by Groups Respecting Dependencies
11	Shortest Path Visiting All Nodes
12	Critical Connections in a Network
13	Sliding Window Median
14	Edit Distance
15	Checking Existence of Edge Length Limited Paths
16	Perfect Rectangle
17	Minimum Window Subsequence
18	Remove Max Number of Edges to Keep Graph Fully Traversable
19	K Inverse Pairs Array
20	Merge K Sorted Lists
21	Minimum Replacements to Sort the Array
22	Design Movie Rental System
23	Sliding Window Maximum
24	My Calendar III
25	Longest Cycle in a Graph
26	Text Justification
27	Design In-Memory File System
28	Basic Calculator III
29	Integer to English Words
30	Naming a Company
31	Minimum Number of Refueling Stops
32	Rearrange String k Distance Apart
33	Make Array Strictly Increasing
34	Median of Two Sorted Arrays
35	Vertical Order Traversal Of a Binary Tree
36	Divide Array Into Increasing Sequences
37	Word Break II
38	Maximum Number of Non-Overlapping Substrings
39	Paint House II
40	Subarrays with K Different Integers
41	Maximum Performance of a Team
42	Jump Game IV
43	Paint House III
44	LFU Cache
45	Scramble String
46	Word Search II
47	K Empty Slots
48	Employee Free Time
49	Maximize Score After N Operations
50	Max Points on a Line
51	The Skyline Problem
52	N-Queens
53	Longest Palindrome Product
54	Odd Even Jump
55	Palindrome Pairs
56	Stream of Characters
57	Cut Off Trees for Golf Event
58	Kth Smallest Number in Multiplication Table
59	String Compression II
60	Minimize Deviation in Array
61	Minimum Cost to Hire K Workers
62	Find the Longest Valid Obstacle Course at Each Position
63	Number of Valid Subarrays
64	Maximum Value of K Coins From Piles
65	Substring with Concatenation of All Words
66	Number of Paths with Max Score
67	Profitable Schemes
68	Design Search Autocomplete System
69	Number of Squareful Arrays
70	N-Queens II
71	Robot Room Cleaner
72	Poor Pigs
73	Minimum Window Substring
74	Number of Ways of Cutting a Pizza
75	Hard
76	Parsing A Boolean Expression
77	Trapping Rain Water
78	Similar String Groups
79	Number of Ways to Form a Target String Given a Dictionary
80	Find the Kth Smallest Sum of a Matrix With Sorted Rows
81	Optimal Account Balancing
82	Design Skiplist
83	Wildcard Matching
84	Expression Add Operators
85	Count of Smaller Numbers After Self
86	Number of Ways to Reorder Array to Get Same BST
87	Find Median from Data Stream
88	Best Time to Buy and Sell Stock IV
89	Find Minimum in Rotated Sorted Array II
90	Longest Valid Parentheses
91	Stone Game III
92	Reducing Dishes
93	Count Subarrays With Fixed Bounds
94	Stamping The Sequence
95	Number of Submatrices That Sum to Target
96	Candy
97	Minimum Insertion Steps to Make a String Palindrome
98	Shortest Distance from All Buildings
99	Recover a Tree From Preorder Traversal
100	Count Vowels Permutation
101	Longest Increasing Path in a Matrix
102	Maximum Profit in Job Scheduling
103	Closest Binary Search Tree Values II
104	Basic Calculator
105	Alien Dictionary
106	Prefix and Suffix Search
107	Construct Target Array With Multiple Sums
108	Tallest Billboard
109	Largest Color Value in a Directed Graph
110	Valid Number
111	Dice Roll Simulation
112	Maximum Frequency Stack
113	Reverse Nodes in k-Group
114	Serialize and Deserialize N-ary Tree
115	Serialize and Deserialize a Binary Tree
116	Minimum Difficulty of a Job Schedule
117	Unique Paths III
118	Restore The Array
119	IPO
120	Insert Delete GetRandom O(1) - Duplicates Allowed
121	Add Edges to Make Degrees of All Nodes Even
122	Maximum Sum BST in Binary Tree
123	Binary Tree Maximum Path Sum
124	Largest Rectangle in Histogram