LeetCodeCPP

This repo serves as a collection of LeetCode solutions and compiled lists of "Getting Started" questions along with written articles explaining different topics in datastructures and algorithms 🚀

This repo is frequently updated with either the following:

1. Solutions to new problems 📁
2. Improvement on existing solutions 🛠️
3. Links to newly written articles on DS & Alg. 📝

Current Stats 📊

Difficulty	Count
Easy	219
Medium	241
Hard	34
Total	494

Getting Started in data structures

My Articles
Stacks
Queues
Linked Lists
Binary Search Trees
Hash Tables
Heaps & Priority Queues
[InProgress] Graphs
Tries

Advanced data structures

My Articles
Red-Black Trees
[InProgress] AVL Trees
[InProgress] B-Trees
[InProgress] Skip Lists
[InProgress] Minimum Spanning Trees
[InProgress] Union Find / Disjoin Sets
[InProgress] Binomial Heaps

Recommended Questions

Question	Difficulty	Description
3Sum	Medium	https://leetcode.com/problems/3sum/
Minimum Window Substring	Hard	https://leetcode.com/problems/minimum-window-substring/
Restore IP Addresses	Medium	https://leetcode.com/problems/restore-ip-addresses/
Find K Pairs with Smallest Sums	Medium	https://leetcode.com/problems/find-k-pairs-with-smallest-sums/
Remove Duplicates From Sorted List II	Medium	https://leetcode.com/problems/remove-duplicates-from-sorted-list-ii/
Word Pattern	Easy	https://leetcode.com/problems/word-pattern/
Set Mismatch	Easy	https://leetcode.com/problems/set-mismatch/
Exam Room	Medium	https://leetcode.com/problems/exam-room/
Permutation In String	Medium	https://leetcode.com/problems/permutation-in-string/
Network Delay Time	Medium	https://leetcode.com/problems/network-delay-time/
Maximum Profit in Job Scheduling	Hard	https://leetcode.com/problems/maximum-profit-in-job-scheduling/
Populating Next Right Pointers Each Node	Medium	https://leetcode.com/problems/populating-next-right-pointers-in-each-node/
Add Strings	Easy	https://leetcode.com/problems/add-strings/
Longest Palindrome	Easy	https://leetcode.com/problems/longest-palindrome/
Add Two Numbers II	Medium	https://leetcode.com/problems/add-two-numbers-ii/
Flatten A Multilevel Doubly Linked List	Medium	https://leetcode.com/problems/flatten-a-multilevel-doubly-linked-list/
All Nodes Distance K In Binary Tree	Medium	https://leetcode.com/problems/all-nodes-distance-k-in-binary-tree/
Single Element In Sorted Array	Medium	https://leetcode.com/problems/single-element-in-a-sorted-array/
Friend Circles	Medium	https://leetcode.com/problems/friend-circles/
Subsets	Medium	https://leetcode.com/problems/subsets/
Occurences After Bigram	Easy	https://leetcode.com/problems/occurrences-after-bigram/
Letter Case Permutation	Medium	https://leetcode.com/problems/letter-case-permutation/
Shortest Distance To A Character	Easy	https://leetcode.com/problems/shortest-distance-to-a-character/
Find All Duplicates In An Array	Medium	https://leetcode.com/problems/find-all-duplicates-in-an-array/
Range Sum Of BST	Easy	https://leetcode.com/problems/range-sum-of-bst/

Getting Started 👌 (questions are not sorted by difficulty)

Easy

• Reverse Integer
• Two Sum
• Missing Number
• Valid parentheses
• Add Strings
• Longest Palindrome
• Occurences After Bigram
• Set Mismatch
• Shortest Distance to a Character
• Word Pattern
• Rotate Array
• Merge Two Sorted Lists
• Lowest Common Ancestor of a Binary Tree
• Path Sum
• Min Stack

(More To ADD)

Medium

• 3Sum
• Jump Game
• Add Two Numbers II
• All Nodes Distance K in Binary Tree
• Exam Room
• Find All Duplicates in an Array
• Letter Case Permutation
• Permutation in String
• Remove Duplicates from Sorted List II
• Flatten a Multilevel Doubly Linked List
• Single Element in a Sorted Array
• Subsets
• Longest Valid Parentheses
• Kth Largest Element in an Array
• Merge k Sorted Lists
• Sliding Window Maximum
• Spiral Matrix
• Validate Binary Search Tree
• Frog Jump
• Remove Nth Node From End of List
• Course Schedule

(More To ADD)

Hard

• LRU Cache

(More To ADD)