Neet code - Algorithms & Data Structures for Beginners

• ARRAYS
• LINKED LISTS
• RECURSION
• SORTING
• BINARY SEARCH
• TREES
• BACKTRACKING
• HEAP PRIORITY QUEUE
• HASHING
• GRAPHS
• DYNAMIC PROGRAMMING
• BIG MANIPULATION

ARRAYS

Difficulty	Problem	Solution
$${\color{green}Easy}$$	Remove Duplicates from Sorted Array	Python | PHP
$${\color{green}Easy}$$	Remove Element	Python | PHP
$${\color{green}Easy}$$	Shuffle the Array	Python | PHP
$${\color{green}Easy}$$	Concatenation of Array	Python | PHP
$${\color{green}Easy}$$	Baseball Game	Python | PHP
$${\color{green}Easy}$$	Valid Parentheses	Python | PHP
$${\color{gold}Medium}$$	Min Stack	Python | PHP

LINKED LISTS

Difficulty	Problem	Solution
$${\color{green}Easy}$$	Reverse Linked List	Python | PHP
$${\color{green}Easy}$$	Merge Two Sorted Lists	Python | PHP
$${\color{gold}Medium}$$	Design Linked List	Python | PHP
$${\color{gold}Medium}$$	Design Browser History	Python | PHP
$${\color{green}Easy}$$	Number of Students Unable to Eat Lunch	Python | PHP
$${\color{green}Easy}$$	Implement Stack using Queues	Python | PHP

RECURSION

Difficulty	Problem	Solution
$${\color{green}Easy}$$	Reverse Linked List	Python | PHP
$${\color{green}Easy}$$	Fibonacci Number	Python | PHP
$${\color{green}Easy}$$	Climbing Stairs	Python | PHP

SORTING

Difficulty	Problem	Solution
$${\color{gold}Medium}$$	Sort an Array	Python | PHP
$${\color{red}Hard}$$	Merge k Sorted Lists	Python | PHP
$${\color{gold}Medium}$$	Kth Larges Element in an Array	Python | PHP
$${\color{gold}Medium}$$	Sort Colors	Python | PHP

BINARY SEARCH

Difficulty	Problem	Solution
$${\color{green}Easy}$$	Binary Search	Python | PHP
$${\color{gold}Medium}$$	Search a 2D Matrix	Python | PHP

TREES

Difficulty	Problem	Solution
$${\color{green}Easy}$$	Search in a Binary Search Tree	Python | PHP
$${\color{gold}Medium}$$	Lowest Common Ancestor of a Binary Search Tree	Python | PHP
$${\color{gold}Medium}$$	Insert into a Binary Search Tree	Python | PHP
$${\color{gold}Medium}$$	Delete Node in a BST	Python | PHP
$${\color{green}Easy}$$	Binary Tree Inorder Traversal	Python | PHP
$${\color{gold}Medium}$$	Kth Smallest Element in a BST	Python | PHP
$${\color{gold}Medium}$$	Construct Binary Tree from Preorder and Inorder traversal	Python | PHP
$${\color{gold}Medium}$$	Binary Tree Level Order Traversal	Python | PHP
$${\color{gold}Medium}$$	Binary Tree Right Side View	Python | PHP

BACKTRACKING

Difficulty	Problem	Solution
$${\color{green}Easy}$$	Path Sum	Python | PHP
$${\color{gold}Medium}$$	Subsets	Python | PHP
$${\color{gold}Medium}$$	Combination Sum	Code

HEAP PRIORITY QUEUE

Difficulty	Problem	Solution
$${\color{green}Easy}$$	Kth Largest Element in a Stream	Code
$${\color{green}Easy}$$	Last Stone Weight	Code
$${\color{gold}Medium}$$	K Closest Point to Origin	Code

HASHING

Difficulty	Problem	Solution
$${\color{green}Easy}$$	Contains Duplicate	Code
$${\color{green}Easy}$$	Two Sum	Code
$${\color{gold}Medium}$$	LRU Cache	Code
$${\color{green}Easy}$$	Design HashSet	Code
$${\color{green}Easy}$$	Design HashMap	Code

GRAPHS

Difficulty	Problem	Solution
$${\color{gold}Medium}$$	Number of Islands	Code
$${\color{gold}Medium}$$	Max Area of Island	Code
$${\color{gold}Medium}$$	Shortest Path in Binary Matrix	Code
$${\color{gold}Medium}$$	Rotting Oranges	Code
$${\color{gold}Medium}$$	Clone Graph	Code
$${\color{gold}Medium}$$	Courses Schedule	Code

DYNAMIC PROGRAMMING

Difficulty	Problem	Solution
$${\color{gold}Medium}$$	House Robber	Code
$${\color{gold}Medium}$$	Unique Paths	Code
$${\color{gold}Medium}$$	Unique Paths II	Code
$${\color{gold}Medium}$$	Longest Common Subsequence	Code

BIG MANIPULATION

Difficulty	Problem	Solution
$${\color{green}Easy}$$	Number of 1 Bits	Code
$${\color{green}Easy}$$	Counting Bits	Code
$${\color{green}Easy}$$	Reverse Bits	Code