README.md

LeetCode solutions in Go

Data structures implemented in golang

1. Linked Lists (insertion, deletion, search, reverse):
   • Singly linked list
   • Doubly linked list
2. Stacks (push, pop, peek):
   • Using arrays/slices
   • Using linked lists
3. Queues:
   • Using arrays/slices
   • Using linked lists
4. Hash Tables (insert, delete, search)
   • Basic implementation
5. Trees (insertion, deletion, traversal: inorder, preorder, postorder):
   • Binary tree
   • Binary Search Tree (BST)
   • AVL tree (self-balancing)
6. Heaps (insert, delete, extract-min/max):
   • Min-Heap
   • Max-Heap
7. Graphs (add edge, remove edge, search: DFS, BFS):
   • Adjacency matrix
   • Adjacency list

Algorithms implemented in golang

1. Sorting Algorithms:
   • Bubble sort
   • Selection sort
   • Insertion sort
   • Merge sort
   • Quick sort
   • Heap sort
2. Searching Algorithms:
   • Linear search
   • Binary search
3. Graph Algorithms:
   • Depth-First Search (DFS)
   • Breadth-First Search (BFS)
   • Dijkstra’s algorithm (shortest path)
   • Floyd-Warshall algorithm (all pairs shortest path)
4. Dynamic Programming:
   • Fibonacci sequence
   • Longest Common Subsequence (LCS)
   • Knapsack problem
   • Coin change problem
5. Backtracking:
   • N-Queens problem
   • Sudoku solver
   • Subset sum problem

LeetCode Problems and solutions

Number	Title	Difficulty	Solution
1	Two Sum	Easy	two-sum
12	Integer to Roman	Medium	integer-to-roman
13	Roman to Integer	Easy	roman-to-integer
14	Longest Common Prefix	Easy	longest-common-prefix
20	Valid Parentheses	Easy	valid-parentheses
22	Generate Parentheses	Medium	generate-parentheses
26	Remove Duplicates from Sorted Array	Easy	remove-duplicates-from-sorted-array
27	Remove Element	Easy	remove-element
28	Find the Index of the First Occurrence in a String	Easy	find-the-index-of-the-first-occurrence-in-a-string
36	Valid Sudoku	Medium	valid-sudoku
49	Group Anagrams	Medium	group-anagrams
58	Length of Last Word	Easy	length-of-last-word
80	Remove Duplicates from Sorted Array II	Medium	remove-duplicates-from-sorted-array-ii
88	Merge Sorted Array	Easy	merge-sorted-array
121	Best Time to Buy and Sell Stock	Easy	best-time-to-buy-and-sell-stock
122	Best Time to Buy and Sell Stock II	Medium	best-time-to-buy-and-sell-stock-ii
125	Valid Palindrome	Easy	valid-palindrome
128	Longest Consecutive Sequence	Medium	longest-consecutive-sequence
136	Single Number	Easy	single-number
150	Evaluate Reverse Polish Notation	Medium	evaluate-reverse-polish-notation
155	Min Stack	Medium	min-stack
169	Majority Element	Easy	majority-element
189	Rotate Array	Medium	rotate-array
202	Happy Number	Easy	happy-number
205	Isomorphic Strings	Easy	isomorphic-strings
217	Contains Duplicate	Easy	contains-duplicate
219	Contains Duplicate II	Easy	contains-duplicate-ii
238	Product of Array Except Self	Medium	product-of-array-except-self
242	Valid Anagram	Easy	valid-anagram
249	Group Shifted Strings	Medium	group-shifted-strings
271	Encode and Decode Strings	Medium	encode-and-decode-strings
347	Top K Frequent Elements	Medium	top-k-frequent-elements
350	Intersection of Two Arrays II	Easy	intersection-of-two-arrays-ii
359	Logger Rate Limiter	Easy	logger-rate-limiter
383	Ransom Note	Easy	ransom-note
387	First Unique Character in a String	Easy	first-unique-character-in-a-string
412	Fizz Buzz	Easy	fizz-buzz
599	Minimum Index Sum of Two Lists	Easy	minimum-index-sum-of-two-lists
652	Find Duplicate Subtrees	Medium	find-duplicate-subtrees
739	Daily Temperatures	Medium	daily-temperatures
876	Middle of the Linked List	Easy	middle-of-the-linked-list
1342	Number of Steps to Reduce a Number to Zero	Easy	richest-customer-wealth
1480	Running Sum of 1d Array	Easy	running-sum-of-1d-array
1672	Richest Customer Wealth	Easy	richest-customer-wealth