HackerRank Topics (Tutorials)

Collection of all HackerRank tutorial topics organized in a logical learning sequence.

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📌 Notes

1. List of topic URLs (As of Feb 29, 2016)
2. Some links may become temporarily unavailable or contain minor typos
3. Topics organized from beginner → advanced within each category
4. I have moved to:
   • https://leetcode.com/u/pgmreddy/
   • https://www.linkedin.com/in/manoharreddyporeddy/

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📊 Legend

Symbol	Difficulty
🟢	Beginner
🟡	Intermediate
🔴	Advanced

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📈 Learning Path Recommendation

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🟢 1. Programming Basics

#	Topic	Link
1	If-Else Statements	if-else-statements
2	Pairs (Tuples)	pair

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🟢 2. Basic Math Operations

#	Topic	Link
3	Average	average
4	Division & Modulo	div-mod
5	Ceiling & Floor Functions	ceil-floor
6	Finding Maximum & Minimum	finding-max-min
7	Maxima & Minima	maxima-minima
8	Square Root	square-root
9	Integer to Array Conversion	integer-to-array
10	Binary Number System	binary

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🟢 3. Bit Manipulation

#	Topic	Link
11	Bitwise OR	bitwise-or
12	Bitwise XOR	bitwise-xor

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🟢 4. Basic Data Structures

#	Topic	Link
13	Arrays	arrays
14	Pointers & Linked Lists (Intro)	pointers-and-linked-lists
15	Linked Lists	linked-lists
16	Stacks	stacks
17	Queues	queues
18	Dictionary (Hash Map)	dictionary
19	Set	set
20	Multi-Set	multi-set

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🟢 5. String Fundamentals

#	Topic	Link
21	String Basics	string-basics
22	Alphabets	alphabets
23	Strings (Essay)	strings-essay
24	Strings (Comprehensive)	strings-long
25	Palindrome	palindrome
26	Anagram	anagram
27	Next Permutation	next-permutation

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🟢 6. Basic Techniques

#	Topic	Link
28	Prefix Sum	prefix-sum
29	Two Pointer Technique	two-pointer-technique
30	Precomputation	precomputation
31	Caching	caching
32	Counting Techniques	counting

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🟡 7. Sorting Algorithms

#	Topic	Link
33	Sorting (Introduction)	sorting
34	Sorting (Essay)	sorting-essay
35	Sorting (Comprehensive)	sorting-long
36	Insertion Sort	insertion-sort
37	Counting Sort	counting-sort
38	Merge Sort	merge-sort
39	Quicksort	quicksort

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🟡 8. Searching Algorithms

#	Topic	Link
40	Search (Introduction)	search
41	Search (Essay)	search-essay
42	Binary Search	binary-search
43	Ternary Search	ternary-search

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🟡 9. Number Theory & Arithmetic

#	Topic	Link
44	Divisors	divisors
45	Greatest Common Divisor (GCD)	gcd
46	Sieve of Eratosthenes	sieve-of-eratosthenes
47	Sieve of Eratosthenes (Linear Time)	sieve-of-eratosthenes-linear-time
48	Euler's Totient Function	euler-function
49	Fibonacci Numbers	fibonacci-numbers
50	Binet's Formula	binets-formula
51	Closed-Form Expressions	closed-form
52	Fast Exponentiation	fast-exponentiation
53	Matrix Exponentiation	matrix-exponentiation
54	Diophantine Equations (ax + by = c)	diophantine-equations-with-two-unknowns-ax-by-c
55	Gaussian Elimination	gaussian-elimination

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🟡 10. Combinatorics & Probability

#	Topic	Link
56	Basic Combinatorics	basic-combinatorics
57	Expectation Values	expectation-values
58	Burnside's Lemma	burnsides-lemma

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🟡 11. Geometry

#	Topic	Link
59	Manhattan Distance	manhattan-distance
60	2-Line Intersection	2-line-intersection
61	3D Lines	3d-lines
62	3D Planes	3d-planes
63	Convex Hull	convex-hull

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🟡 12. Trees & Heaps

#	Topic	Link
64	Binary Trees & Binary Search Trees	binary-trees-and-binary-search-trees
65	Tree Traversals	tree-traversals
66	Heaps	heaps
67	Priority Queue	priority-queue
68	Disjoint Set (Union-Find)	disjoint-set
69	Lowest Common Ancestor (LCA)	lowest-common-ancestor
70	Diameter in Trees	diameter-in-trees

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🟡 13. Graph Fundamentals

#	Topic	Link
71	Depth-First Search (DFS)	depth-first-search
72	Breadth-First Search (BFS)	breadth-first-search
73	Topological Sorting	topological-sorting

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🟡 14. Shortest Path Algorithms

#	Topic	Link
74	Shortest Paths in Graphs (Intro)	shortest-paths-in-graphs
75	Shortest Path in Graphs	shortest-path-in-graphs
76	Dijkstra's Algorithm	dijkstras-algorithm
77	Bellman-Ford Algorithm	bellman-ford-algorithm
78	Floyd-Warshall Algorithm	floyd-warshall-algorithm
79	Bipartite Matching	bipartite-matching

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🟡 15. Greedy Algorithms

#	Topic	Link
80	Greedy Technique	greedy-technique

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🟡 16. Dynamic Programming

#	Topic	Link
81	Dynamic Programming Basics	dynamic-programming-basics
82	Dynamic Programming	dynamic-programming
83	Longest Common Subsequence (LCS)	longest-common-subsequence
84	Digit DP	digit-dp

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🔴 17. Advanced Data Structures

#	Topic	Link
85	Trie (Prefix Tree)	trie
86	Segment Tree	segment-tree
87	Lazy Propagation	lazy-propagation
88	Binary Indexed Tree (Fenwick Tree)	binary-indexed-tree
89	Sparse Tables	sparse-tables
90	Persistent Data Structures	persistent-data-structures

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🔴 18. Advanced String Algorithms

#	Topic	Link
91	Suffix Array	suffix-array
92	LCP Array (Longest Common Prefix)	lcp-array
93	Z-Function (Z-Algorithm)	z-function
94	Manacher's Algorithm	manachers-algorithm

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🔴 19. Advanced Algorithms & Techniques

#	Topic	Link
95	Mo's Algorithm	mos-algorithm

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🔴 20. Game Theory

#	Topic	Link
96	Game Theory & Grundy Numbers	game-theory-and-grundy-numbers

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🔴 21. Advanced Theorems & Formulas

#	Topic	Link
97	Prüfer's Code & Cayley's Formula	prufers-code-and-cayleys-formula
98	Dilworth's Theorem	dilworths-theorem
99	Turán's Theorem	turans-theorem

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Total Topics: 99

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