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Name	Name	Last commit message	Last commit date
parent directory ..
Basic Calculator III.java	Basic Calculator III.java
Basic Calculator.java	Basic Calculator.java
Binary Tree Maximum Path Sum.java	Binary Tree Maximum Path Sum.java
Binary Tree PostOrder Traversal.java	Binary Tree PostOrder Traversal.java
Candy.java	Candy.java
Closest Binary Search Tree Values II.java	Closest Binary Search Tree Values II.java
Concatenated Words.java	Concatenated Words.java
Cut Off Trees for Golf Event.java	Cut Off Trees for Golf Event.java
Design Search Autocomplete System.java	Design Search Autocomplete System.java
Divide Array Into Increasing Sequences.java	Divide Array Into Increasing Sequences.java
Edit Distance.java	Edit Distance.java
Employee Free Time.java	Employee Free Time.java
Find Median From Data Stream.java	Find Median From Data Stream.java
Find Minimum in Rotated Sorted Array II.java	Find Minimum in Rotated Sorted Array II.java
First Missing Positive.java	First Missing Positive.java
Frog Jump.java	Frog Jump.java
Hard.md	Hard.md
Insert Delete GetRandom O(1) - Duplicates Allowed.java	Insert Delete GetRandom O(1) - Duplicates Allowed.java
Insert Interval.java	Insert Interval.java
Integer to English Words.java	Integer to English Words.java
Interleaving String.java	Interleaving String.java
K Empty Slots.java	K Empty Slots.java
LFU Cache.java	LFU Cache.java
LRU Cache.java	LRU Cache.java
Largest Rectangle in Histogram.java	Largest Rectangle in Histogram.java
Longest Consecutive Sequence.java	Longest Consecutive Sequence.java
Longest Increasing Path in a Matrix.java	Longest Increasing Path in a Matrix.java
Longest Palindrome Product.java	Longest Palindrome Product.java
Longest Substring with At Most K Distinct Characters.java	Longest Substring with At Most K Distinct Characters.java
Longest Substring with At Most Two Distinct Characters.java	Longest Substring with At Most Two Distinct Characters.java
Maximum Frequency Stack.java	Maximum Frequency Stack.java
Maximum Number of Non-Overlapping Substrings.java	Maximum Number of Non-Overlapping Substrings.java
Maximum Sum BST in Binary Tree.java	Maximum Sum BST in Binary Tree.java
Median of Two Sorted Arrays.java	Median of Two Sorted Arrays.java
Merge K Sorted Lists.java	Merge K Sorted Lists.java
Minimize Deviation in Array.java	Minimize Deviation in Array.java
Minimum Cost to Hire K Workers.java	Minimum Cost to Hire K Workers.java
Minimum Window Substring.java	Minimum Window Substring.java
N-Queens.java	N-Queens.java
Number of Paths with Max Score.java	Number of Paths with Max Score.java
Number of Squareful Arrays.java	Number of Squareful Arrays.java
Number of Submatrices That Sum to Target.java	Number of Submatrices That Sum to Target.java
Number of Valid Subarrays.java	Number of Valid Subarrays.java
Odd Even Jump.java	Odd Even Jump.java
Optimal Account Balancing.java	Optimal Account Balancing.java
Palindrome Pairs.java	Palindrome Pairs.java
Parallel Courses.java	Parallel Courses.java
Parsing A Boolean Expression.java	Parsing A Boolean Expression.java
Prefix and Suffix Search.java	Prefix and Suffix Search.java
README.md	README.md
Recover a Tree From Preorder Traversal.java	Recover a Tree From Preorder Traversal.java
Remove Invalid Parentheses.java	Remove Invalid Parentheses.java
Reverse Nodes in k-Group.java	Reverse Nodes in k-Group.java
Robot Room Cleaner.java	Robot Room Cleaner.java
Serialize and Deserialize N-ary Tree.java	Serialize and Deserialize N-ary Tree.java
Serialize and Deserialize a Binary Tree.java	Serialize and Deserialize a Binary Tree.java
Shortest Distance from All Buildings.java	Shortest Distance from All Buildings.java
Sliding Window Maximum.java	Sliding Window Maximum.java
Sliding Window Median.java	Sliding Window Median.java
Stream of Characters.java	Stream of Characters.java
Subarrays with K Different Integers.java	Subarrays with K Different Integers.java
Substring with Concatenation of All Words.java	Substring with Concatenation of All Words.java
Text Justification.java	Text Justification.java
Trapping Rain Water.java	Trapping Rain Water.java
Unique Paths III.java	Unique Paths III.java
Valid Number.java	Valid Number.java
Word Break II.java	Word Break II.java
Word Search II.java	Word Search II.java
View all files

README.md

Hard LeetCode-Java-Solutions

S.no	Coding Problem
1	Merge K Sorted Lists
2	Serialize and Deserialize a Binary Tree
3	Palindrome Pairs
4	Binary Tree PostOrder Traversal
5	Largest Rectangle in Histogram
6	Trapping Rain Water
7	Parallel Courses
8	LFU Cache
9	Unique Paths III
10	Integer to English Words
11	Number of Valid Subarrays
12	Candy
13	Odd Even Jump
14	Longest Consecutive Sequence
15	Substring with Concatenation of All Words
16	Median of Two Sorted Arrays
17	Hard
18	Longest Substring with At Most K Distinct Characters
19	Closest Binary Search Tree Values II
20	Edit Distance
21	Longest Palindrome Product
22	K Empty Slots
23	Cut Off Trees for Golf Event
24	Word Break II
25	LRU Cache
26	Parsing A Boolean Expression
27	Maximum Frequency Stack
28	N-Queens
29	Sliding Window Maximum
30	Optimal Account Balancing
31	Divide Array Into Increasing Sequences
32	Serialize and Deserialize N-ary Tree
33	Word Search II
34	Insert Delete GetRandom O(1) - Duplicates Allowed
35	Recover a Tree From Preorder Traversal
36	Text Justification
37	Find Median From Data Stream
38	Number of Submatrices That Sum to Target
39	First Missing Positive
40	Minimum Window Substring
41	Stream of Characters
42	Prefix and Suffix Search
43	Longest Substring with At Most Two Distinct Characters
44	Find Minimum in Rotated Sorted Array II
45	Sliding Window Median
46	Basic Calculator
47	Binary Tree Maximum Path Sum
48	Interleaving String
49	Valid Number
50	Robot Room Cleaner
51	Employee Free Time
52	Design Search Autocomplete System
53	Basic Calculator III
54	Longest Increasing Path in a Matrix