LeetCode Top 100 Liked Questions

#	Title	Question	Solution	Difficulty
01	Two Sum	LeetCode 1	Java	Easy
02	Valid Parentheses	LeetCode 20		Easy
03	Merge Two Sorted Lists	LeetCode 21	Java	Easy
04	Maximum Subarray	LeetCode 53	Java	Easy
05	Climbing Stairs	LeetCode 70		Easy
06	Symmetric Tree	LeetCode 101	Java	Easy
07	Maximum Depth of Binary Tree	LeetCode 104	Java	Easy
08	Best Time to Buy and Sell Stock	LeetCode 121		Easy
09	Single Number	LeetCode 136	Java	Easy
10	Linked List Cycle	LeetCode 141	Java	Easy
11	Min Stack	LeetCode 155	Java	Easy
12	Intersection of Two Linked Lists	LeetCode 160		Easy
13	Majority Element	LeetCode 169	Java	Easy
14	House Robber	LeetCode 198		Easy
15	Reverse Linked List	LeetCode 206	Java	Easy
16	Invert Binary Tree	LeetCode 226	Java	Easy
17	Palindrome Linked List	LeetCode 234	Java	Easy
18	Move Zeroes	LeetCode 283	Java	Easy
19	Path Sum III	LeetCode 437	Java	Easy
20	Find All Numbers Disappeared in an Array	LeetCode 448	Java	Easy
21	Convert BST to Greater Tree	LeetCode 538	Java	Easy
22	Diameter of Binary Tree	LeetCode 543	Java	Easy
23	Shortest Unsorted Continuous Subarray	LeetCode 581		Easy
24	Merge Two Binary Trees	LeetCode 617	Java	Easy
25	Jewels and Stones	LeetCode 771	Java	Easy

Coding-Interview-Patterns

01. Sliding Window

#	Title	Question	Solution	Difficulty
	Average of all subarrays of size K		Java	Easy
01	Maximum Sum Subarray of Size K		Java	Easy
02	Smallest Subarray with a given sum	LeetCode 209	Java	Medium
03	Longest Substring with K Distinct Characters		Java	Medium
04	Fruits into Baskets		Java	Medium
05	No-repeat Substring			Hard
06	Longest Substring with Same Letters after Replacement			Hard
07	Longest Subarray with Ones after Replacement			Hard

02. Two Pointers

#	Title	Question	Solution	Difficulty
01	Pair with Target Sum		Java	Easy
02	Remove Duplicates	LeetCode 26	Java	Easy
	Remove Element	LeetCode 27	Java	Easy
03	Squaring a Sorted Array	LeetCode 977	Java	Easy
04	Triplet Sum to Zero	LeetCode 15	Java	Medium
05	Triplet Sum Close to Target	LeetCode 16	Java	Medium
06	Triplets with Smaller Sum			Medium
07	Subarrays with Product Less than a Target			Medium
08	Dutch National Flag Problem			Medium
09	Quadruple Sum to Target			Medium
10	Comparing Strings containing Backspaces			Medium
11	Minimum Window Sort			Medium
12	Maximum Trapping Water			Medium

03. Fast & Slow pointers

#	Title	Question	Solution	Difficulty
01	LinkedList Cycle	LeetCode 141	Java	Easy
	LinkedList Cycle Length	GeeksforGeeks	Java	Easy
02	Start of LinkedList Cycle	LeetCode 142	Java	Medium
03	Happy Number	LeetCode 202	Java	Easy
04	Middle of the LinkedList	LeetCode 876	Java	Easy
05	Palindrome LinkedList	LeetCode 234	Java	Medium
06	Rearrange a LinkedList			Medium
07	Cycle in a Circular Array			Hard

04. Merge Intervals

#	Title	Question	Solution	Difficulty
01	Merge Intervals	LeetCode 56	Java	Medium
02	Insert Intervals	LeetCode 57	Java	Hard
03	Intervals Intersection			Medium
04	Conflicting Appointments			Medium

05. Cyclic Sort

#	Title	Question	Solution	Difficulty
01	Cyclic Sort		Java	Easy
02	Find the Missing Number	LeetCode 268	Java	Easy
03	Find all Missing Numbers		Java	Easy
04	Find the Duplicate Number	LeetCode 287	Java	Medium
05	Find all Duplicate Numbers		Java	Easy
06	Find the Corrupt Pair			Easy
07	Find the Smallest Missing Positive Number			Medium
08	Find the First K Missing Positive Numbers			Hard

06. In-place Reversal of a LinkedList

#	Title	Question	Solution	Difficulty
01	Reverse a LinkedList	LeetCode 206	Java	Easy
02	Reverse a Sub-list	LeetCode 92	Java	Medium
03	Reverse every K-element Sub-list		Java	Medium
04	Reverse alternating K-element Sub-list			Medium
05	Rotate a LinkedList			Medium

07. Tree BFS

#	Title	Question	Solution	Difficulty
01	Binary Tree Level Order Traversal	LeetCode 102	Java	Medium
02	Reverse Level Order Traversal	LeetCode 107	Java	Easy
03	Zigzag Traversal	LeetCode 103	Java	Medium
04	Level Averages in a Binary Tree	LeetCode 637	Java	Easy
05	Minimum Depth of a Binary Tree	LeetCode 111	Java	Easy
06	Level Order Successor		Java	Easy
07	Connect Level Order Siblings	LeetCode 116	Java	Medium
08	Connect All Level Order Siblings		Java	Medium
09	Right View of a Binary Tree	LeetCode 199	Java	Medium
10	Tree Boundary			Hard

08. Tree DFS

#	Title	Question	Solution	Difficulty
01	Binary Tree Path Sum	LeetCode 112	Java	Easy
02	All Paths for a Sum	LeetCode 113	Java	Medium
03	Sum of Path Numbers		Java	Medium
04	Path With Given Sequence		Java	Medium
05	Count Paths for a Sum	LeetCode 437	Java	Easy
06	Tree Diameter	LeetCode 543	Java	Easy
07	Path with Maximum Sum	LeetCode 124	Java	Hard

09. Two Heaps

#	Title	Question	Solution	Difficulty
01	Find the Median of a Number Stream	LeetCode 295	Java	Hard
02	Sliding Window Median	LeetCode 480	Java	Hard
03	Maximize Capital			Hard
04	Next Interval			Hard

10. Subsets

#	Title	Question	Solution	Difficulty
01	Subsets	LeetCode 78	Java	Medium
02	Subsets With Duplicates	LeetCode 90	Java	Medium
03	Permutations			Medium
04	String Permutations by changing case			Medium
05	Balanced Parentheses			Hard
06	Unique Generalized Abbreviations			Hard

11. Modified Binary Search

#	Title	Question	Solution	Difficulty
01	Order-agnostic Binary Search	LeetCode 704	Java	Easy
02	Ceiling of a Number	GeeksforGeeks	Java	Medium
	Floor of a Number	GeeksforGeeks	Java	Medium
03	Next Letter		Java	Medium
04	Number Range			Medium
05	Search in a Sorted Infinite Array			Medium
06	Minimum Difference Element			Medium
07	Bitonic Array Maximum		Java	Easy
08	Search Bitonic Array		Java	Medium
09	Search in Rotated Array			Medium
10	Rotation Count			Medium

12. Top 'K' Elements

#	Title	Question	Solution	Difficulty
01	Top 'K' Numbers	GeeksforGeeks	Java	Easy
02	Kth Smallest Number	GeeksforGeeks	Java	Easy
03	'K' Closest Points to the Origin	LeetCode 973	Java	Medium
04	Connect Ropes		Java	Easy
05	Top 'K' Frequent Numbers	LeetCode 347	Java	Medium
06	Frequency Sort	LeetCode 451	Java	Medium
07	Kth Largest Number in a Stream			Medium
08	'K' Closest Numbers			Medium
09	Maximum Distinct Elements			Medium
10	Sum of Elements			Medium
11	Rearrange String			Medium

13. K-way Merge

#	Title	Question	Solution	Difficulty
01	Merge K Sorted Lists	LeetCode 23	Java	Hard
02	Kth Smallest Number in M Sorted Lists		Java	Medium
03	Kth Smallest Number in a Sorted Matrix	LeetCode 378	Java	Hard
04	Smallest Number Range			Hard
05	K Pairs with Largest Sums		Java	Hard

14. 0/1 Knapsack (Dynamic Programming)

#	Title	Question	Solution	Difficulty
01	0/1 Knapsack Recursive		Java	Medium
	0/1 Knapsack Top-Down		Java	Medium
02	Equal Subset Sum Partition			Medium
03	Subset Sum			Medium
04	Minimum Subset Sum Difference			Hard