HackerRank Solutions in Python3

This is an attempt to learn Python3 by completing challenges on HackerRank. The purpose here is to review coding challenges while learning a new languages. I am still new to the data structures in Python, so some of the solutions may be a little less than elegant:-) I hope to make a second pass to improve upon the code one I get more familure.

This Readme table of contents/progress is autogenerated. See util directory for the tools used to do so, and util/README.md for script execution order.

Index

• Algorithms (11/442)
• Data Structures (0/121)
• Mathematics (0/283)

Algorithms

• Warmup (10/10)
• Implementation (1/66)
• Strings (0/48)
• Sorting (0/15)
• Search (0/26)
• Graph Theory (0/64)
• Greedy (0/24)
• Dynamic Programming (0/99)
• Constructive Algorithms (0/11)
• Bit Manipulation (0/27)
• Recursion (0/11)
• Game Theory (0/32)
• NP Complete (0/4)
• Debugging (0/5)

Warmup

#	Challenge	Solution
1	Solve Me First	Solution
2	Simple Array Sum	Solution
3	Compare the Triplets	Solution
4	A Very Big Sum	Solution
5	Diagonal Difference	Solution
6	Plus Minus	Solution
7	Staircase	Solution
8	Mini-Max Sum	Solution
9	Birthday Cake Candles	Solution
10	Time Conversion	Solution

Implementation

#	Challenge	Solution
1	Grading Students	No Attempt
2	Apple and Orange	No Attempt
3	Kangaroo	No Attempt
4	Between Two Sets	No Attempt
5	Breaking the Records	No Attempt
6	Birthday Chocolate	No Attempt
7	Divisible Sum Pairs	No Attempt
8	Migratory Birds	No Attempt
9	Day of the Programmer	No Attempt
10	Bon Appétit	No Attempt
11	Sock Merchant	No Attempt
12	Drawing Book	No Attempt
13	Counting Valleys	No Attempt
14	Electronics Shop	No Attempt
15	Cats and a Mouse	No Attempt
16	Forming a Magic Square	No Attempt
17	Picking Numbers	No Attempt
18	Climbing the Leaderboard	No Attempt
19	The Hurdle Race	No Attempt
20	Designer PDF Viewer	No Attempt
21	Utopian Tree	No Attempt
22	Angry Professor	No Attempt
23	Beautiful Days at the Movies	No Attempt
24	Viral Advertising	No Attempt
25	Save the Prisoner!	No Attempt
26	Circular Array Rotation	No Attempt
27	Sequence Equation	No Attempt
28	Jumping on the Clouds: Revisited	No Attempt
29	Find Digits	No Attempt
30	Extra Long Factorials	No Attempt
31	Append and Delete	No Attempt
32	Sherlock and Squares	No Attempt
33	Library Fine	No Attempt
34	Cut the sticks	No Attempt
35	Non-Divisible Subset	No Attempt
36	Repeated String	No Attempt
37	Jumping on the Clouds	No Attempt
38	Equalize the Array	No Attempt
39	Queen's Attack II	No Attempt
40	ACM ICPC Team	No Attempt
41	Taum and B'day	No Attempt
42	Organizing Containers of Balls	No Attempt
43	Encryption	No Attempt
44	Bigger is Greater	No Attempt
45	Modified Kaprekar Numbers	No Attempt
46	Beautiful Triplets	No Attempt
47	Minimum Distances	No Attempt
48	Halloween Sale	No Attempt
49	The Time in Words	No Attempt
50	Chocolate Feast	No Attempt
51	Service Lane	No Attempt
52	Lisa's Workbook	No Attempt
53	Flatland Space Stations	No Attempt
54	Fair Rations	No Attempt
55	Cavity Map	No Attempt
56	Manasa and Stones	No Attempt
57	The Grid Search	No Attempt
58	Happy Ladybugs	Solution
59	Strange Counter	No Attempt
60	3D Surface Area	No Attempt
61	Absolute Permutation	No Attempt
62	The Bomberman Game	Unsuccessful Attempt
63	Ema's Supercomputer	No Attempt
64	Larry's Array	No Attempt
65	Almost Sorted	No Attempt
66	Matrix Layer Rotation	No Attempt

Strings

#	Challenge	Solution
1	Super Reduced String	No Attempt
2	CamelCase	No Attempt
3	Strong Password	No Attempt
4	Two Characters	No Attempt
5	Caesar Cipher	No Attempt
6	Mars Exploration	No Attempt
7	HackerRank in a String!	No Attempt
8	Pangrams	No Attempt
9	Weighted Uniform Strings	No Attempt
10	Separate the Numbers	No Attempt
11	Funny String	No Attempt
12	Gemstones	No Attempt
13	Alternating Characters	No Attempt
14	Beautiful Binary String	No Attempt
15	The Love-Letter Mystery	No Attempt
16	Determining DNA Health	No Attempt
17	Palindrome Index	No Attempt
18	Anagram	No Attempt
19	Making Anagrams	No Attempt
20	Game of Thrones - I	No Attempt
21	Two Strings	No Attempt
22	String Construction	No Attempt
23	Sherlock and the Valid String	No Attempt
24	Highest Value Palindrome	No Attempt
25	Maximum Palindromes	No Attempt
26	Sherlock and Anagrams	No Attempt
27	Common Child	No Attempt
28	Bear and Steady Gene	No Attempt
29	Morgan and a String	No Attempt
30	Count Strings	No Attempt
31	String Function Calculation	No Attempt
32	Build a Palindrome	No Attempt
33	Build a String	No Attempt
34	Gridland Provinces	No Attempt
35	Cards Permutation	No Attempt
36	Ashton and String	No Attempt
37	String Similarity	No Attempt
38	Super Functional Strings	No Attempt
39	Circular Palindromes	No Attempt
40	Similar Strings	No Attempt
41	Save Humanity	No Attempt
42	Find Strings	No Attempt
43	Palindromic Border	No Attempt
44	Two Two	No Attempt
45	Two Strings Game	No Attempt
46	Letter Islands	No Attempt
47	Pseudo-Isomorphic Substrings	No Attempt
48	How Many Substrings?	No Attempt

Sorting

#	Challenge	Solution
1	Big Sorting	No Attempt
2	Intro to Tutorial Challenges	No Attempt
3	Insertion Sort - Part 1	No Attempt
4	Insertion Sort - Part 2	No Attempt
5	Correctness and the Loop Invariant	No Attempt
6	Running Time of Algorithms	No Attempt
7	Quicksort 1 - Partition	No Attempt
8	Counting Sort 1	No Attempt
9	Counting Sort 2	No Attempt
10	The Full Counting Sort	No Attempt
11	Closest Numbers	No Attempt
12	Find the Median	No Attempt
13	Insertion Sort Advanced Analysis	No Attempt
14	Fraudulent Activity Notifications	No Attempt
15	Lily's Homework	No Attempt

Search

#	Challenge	Solution
1	Hackerland Radio Transmitters	No Attempt
2	Gridland Metro	No Attempt
3	Ice Cream Parlor	No Attempt
4	KnightL on a Chessboard	No Attempt
5	Minimum Loss	No Attempt
6	Missing Numbers	No Attempt
7	Pairs	No Attempt
8	Sherlock and Array	No Attempt
9	Maximum Subarray Sum	No Attempt
10	Connected Cells in a Grid	No Attempt
11	Short Palindrome	No Attempt
12	Maximizing Mission Points	No Attempt
13	Count Luck	No Attempt
14	Cut the Tree	No Attempt
15	Making Candies	No Attempt
16	Gena Playing Hanoi	No Attempt
17	Beautiful Quadruples	No Attempt
18	Red Knight's Shortest Path	No Attempt
19	Bike Racers	No Attempt
20	Task Scheduling	No Attempt
21	Similar Pair	No Attempt
22	Absolute Element Sums	No Attempt
23	Almost Integer Rock Garden	No Attempt
24	Sorted Subsegments	No Attempt
25	Distant Pairs	No Attempt
26	King Richard's Knights	No Attempt

Graph Theory

#	Challenge	Solution
1	Frog in Maze	No Attempt
2	Roads and Libraries	No Attempt
3	Journey to the Moon	No Attempt
4	Synchronous Shopping	No Attempt
5	Subset Component	No Attempt
6	Breadth First Search: Shortest Reach	No Attempt
7	Kruskal (MST): Really Special Subtree	No Attempt
8	Even Tree	No Attempt
9	Snakes and Ladders: The Quickest Way Up	No Attempt
10	Dijkstra: Shortest Reach 2	No Attempt
11	The Story of a Tree	No Attempt
12	Prim's (MST) : Special Subtree	No Attempt
13	Toll Cost Digits	No Attempt
14	Real Estate Broker	No Attempt
15	Clique	No Attempt
16	Minimum Penalty Path	No Attempt
17	Demanding Money	No Attempt
18	The Value of Friendship	No Attempt
19	Coprime Paths	No Attempt
20	Minimum MST Graph	No Attempt
21	Jack goes to Rapture	No Attempt
22	Crab Graphs	No Attempt
23	Bead Ornaments	No Attempt
24	Jeanie's Route	No Attempt
25	Floyd : City of Blinding Lights	No Attempt
26	Roads in HackerLand	No Attempt
27	Kingdom Connectivity	No Attempt
28	Computer Game	No Attempt
29	Rust & Murderer	No Attempt
30	Problem solving	No Attempt
31	Journey Scheduling	No Attempt
32	Matrix	No Attempt
33	Recording Episodes	No Attempt
34	Repair Roads	No Attempt
35	Kth Ancestor	No Attempt
36	ByteLandian Tours	No Attempt
37	Find the Path	No Attempt
38	Savita And Friends	No Attempt
39	Liars	No Attempt
40	Jumping Rooks	No Attempt
41	Tripartite Matching	No Attempt
42	Tree Flow	No Attempt
43	DAG Queries	No Attempt
44	Favorite sequence	No Attempt
45	Jogging Cats	No Attempt
46	Quadrant Queries	No Attempt
47	Hacker Country	No Attempt
48	HackerX	No Attempt
49	Huarongdao	No Attempt
50	Training the army	No Attempt
51	Jim and his LAN Party	No Attempt
52	Travel in HackerLand	No Attempt
53	Alex vs Fedor	No Attempt
54	Vertical Paths	No Attempt
55	Drive	No Attempt
56	Travelling Salesman in a Grid	No Attempt
57	Road Network	No Attempt
58	Going to the Office	No Attempt
59	Tree Splitting	No Attempt
60	Ticket	No Attempt
61	DFS Edges	No Attempt
62	Diameter Minimization	No Attempt
63	Airports	No Attempt
64	Definite Random Walks	No Attempt

Greedy

#	Challenge	Solution
1	Minimum Absolute Difference in an Array	No Attempt
2	Marc's Cakewalk	No Attempt
3	Grid Challenge	No Attempt
4	Luck Balance	No Attempt
5	Maximum Perimeter Triangle	No Attempt
6	Candies	No Attempt
7	Beautiful Pairs	No Attempt
8	Sherlock and The Beast	No Attempt
9	Priyanka and Toys	No Attempt
10	Largest Permutation	No Attempt
11	Mark and Toys	No Attempt
12	Greedy Florist	No Attempt
13	Max Min	No Attempt
14	Jim and the Orders	No Attempt
15	Permuting Two Arrays	No Attempt
16	Cutting Boards	No Attempt
17	Reverse Shuffle Merge	No Attempt
18	Goodland Electricity	No Attempt
19	Cloudy Day	No Attempt
20	Chief Hopper	No Attempt
21	Sherlock and MiniMax	No Attempt
22	Accessory Collection	No Attempt
23	Team Formation	No Attempt
24	Fighting Pits	No Attempt

Dynamic Programming

#	Challenge	Solution
1	The Coin Change Problem	No Attempt
2	Equal	No Attempt
3	Sherlock and Cost	No Attempt
4	Construct the Array	No Attempt
5	Kingdom Division	No Attempt
6	Sam and substrings	No Attempt
7	Fibonacci Modified	No Attempt
8	Abbreviation	No Attempt
9	Prime XOR	No Attempt
10	Decibinary Numbers	No Attempt
11	Fair Cut	No Attempt
12	The Maximum Subarray	No Attempt
13	Angry Children 2	No Attempt
14	Sherlock's Array Merging Algorithm	No Attempt
15	Prime Digit Sums	No Attempt
16	HackerRank City	No Attempt
17	Summing Pieces	No Attempt
18	Mr K marsh	No Attempt
19	Substring Diff	No Attempt
20	Xor and Sum	No Attempt
21	Lego Blocks	No Attempt
22	Brick Tiling	No Attempt
23	Alien Languages	No Attempt
24	Stock Maximize	No Attempt
25	Two Robots	No Attempt
26	Cut Tree	No Attempt
27	Tara's Beautiful Permutations	No Attempt
28	Wet Shark and Two Subsequences	No Attempt
29	Nikita and the Game	No Attempt
30	Choosing White Balls	No Attempt
31	Mandragora Forest	No Attempt
32	Red John is Back	No Attempt
33	LCS Returns	No Attempt
34	Grid Walking	No Attempt
35	Matrix Land	No Attempt
36	Knapsack	No Attempt
37	Bricks Game	No Attempt
38	The Longest Increasing Subsequence	No Attempt
39	Coin on the Table	No Attempt
40	The Longest Common Subsequence	No Attempt
41	Play with words	No Attempt
42	Black and White Tree	No Attempt
43	Counting Special Sub-Cubes	No Attempt
44	Interval Selection	No Attempt
45	String Reduction	No Attempt
46	Far Vertices	No Attempt
47	Counting Road Networks	No Attempt
48	Superman Celebrates Diwali	No Attempt
49	Hexagonal Grid	No Attempt
50	Queens on Board	No Attempt
51	Shashank and the Palindromic Strings	No Attempt
52	Points in a Plane	No Attempt
53	Turn Off the Lights	No Attempt
54	Animal Transport	No Attempt
55	The Indian Job	No Attempt
56	Requirement	No Attempt
57	A Super Hero	No Attempt
58	Clues on a Binary Path	No Attempt
59	Road Maintenance	No Attempt
60	Billboards	No Attempt
61	Beautiful Strings	No Attempt
62	Covering the stains	No Attempt
63	GCD Matrix	No Attempt
64	Fairy Chess	No Attempt
65	Suffix Rotation	No Attempt
66	New Year Present	No Attempt
67	Travel around the world	No Attempt
68	Longest Palindromic Subsequence	No Attempt
69	Candles Counting	No Attempt
70	Hyper Strings	No Attempt
71	Swap Permutation	No Attempt
72	Extremum Permutations	No Attempt
73	Square Subsequences	No Attempt
74	Dorsey Thief	No Attempt
75	Mining	No Attempt
76	Police Operation	No Attempt
77	Zurikela's Graph	No Attempt
78	Modify The Sequence	No Attempt
79	Longest Mod Path	No Attempt
80	P-sequences	No Attempt
81	Robot	No Attempt
82	Lucky Numbers	No Attempt
83	Unfair Game	No Attempt
84	Oil Well	No Attempt
85	Find the Seed	No Attempt
86	The Blacklist	No Attempt
87	Tree Pruning	No Attempt
88	Ones and Twos	No Attempt
89	Count Scorecards	No Attempt
90	Vim War	No Attempt
91	Best spot	No Attempt
92	Divisible Numbers	No Attempt
93	Unique Divide And Conquer	No Attempt
94	King and Four Sons	No Attempt
95	Dortmund Dilemma	No Attempt
96	Super Kth LIS	No Attempt
97	Counting the Ways	No Attempt
98	Hard Disk Drives	No Attempt
99	Separate the chocolate	No Attempt

Constructive Algorithms

#	Challenge	Solution
1	Lena Sort	No Attempt
2	Flipping the Matrix	No Attempt
3	Gaming Array	No Attempt
4	New Year Chaos	No Attempt
5	Bonetrousle	No Attempt
6	Yet Another KMP Problem	No Attempt
7	Beautiful 3 Set	No Attempt
8	Inverse RMQ	No Attempt
9	Two Subarrays	No Attempt
10	Lovely Triplets	No Attempt
11	Array Construction	No Attempt

Bit Manipulation

#	Challenge	Solution
1	Lonely Integer	No Attempt
2	Maximizing XOR	No Attempt
3	Counter game	No Attempt
4	Xor-sequence	No Attempt
5	Sum vs XOR	No Attempt
6	The Great XOR	No Attempt
7	Flipping bits	No Attempt
8	Yet Another Minimax Problem	No Attempt
9	Sansa and XOR	No Attempt
10	AND Product	No Attempt
11	Winning Lottery Ticket	No Attempt
12	Xoring Ninja	No Attempt
13	Cipher	No Attempt
14	XOR Matrix	No Attempt
15	What's Next?	No Attempt
16	String Transmission	No Attempt
17	A or B	No Attempt
18	Manipulative Numbers	No Attempt
19	Stone Game	No Attempt
20	2's complement	No Attempt
21	Changing Bits	No Attempt
22	XOR key	No Attempt
23	Maximizing the Function	No Attempt
24	XOR Subsequences	No Attempt
25	Iterate It	No Attempt
26	Hamming Distance	No Attempt
27	Mixing proteins	No Attempt

Recursion

#	Challenge	Solution
1	The Power Sum	No Attempt
2	Crossword Puzzle	No Attempt
3	Recursive Digit Sum	No Attempt
4	Simplified Chess Engine	No Attempt
5	Password Cracker	No Attempt
6	Arithmetic Expressions	No Attempt
7	Stone Division, Revisited	No Attempt
8	K Factorization	No Attempt
9	Bowling Pins	No Attempt
10	Simplified Chess Engine II	No Attempt
11	Repetitive K-Sums	No Attempt

Game Theory

#	Challenge	Solution
1	Game of Stones	No Attempt
2	Tower Breakers	No Attempt
3	A Chessboard Game	No Attempt
4	Introduction to Nim Game	No Attempt
5	Misère Nim	No Attempt
6	Nimble Game	No Attempt
7	Alice and Bob's Silly Game	No Attempt
8	Poker Nim	No Attempt
9	Tower Breakers, Revisited!	No Attempt
10	Tower Breakers, Again!	No Attempt
11	Zero-Move Nim	No Attempt
12	Chessboard Game, Again!	No Attempt
13	Digits Square Board	No Attempt
14	Fun Game	No Attempt
15	Stone Division	No Attempt
16	Chocolate in Box	No Attempt
17	Kitty and Katty	No Attempt
18	Powers Game	No Attempt
19	Deforestation	No Attempt
20	Bob and Ben	No Attempt
21	Tower Breakers - The Final Battle	No Attempt
22	Simple Game	No Attempt
23	Permutation game	No Attempt
24	Move the Coins	No Attempt
25	Play on benders	No Attempt
26	New Year Game	No Attempt
27	Stone Piles	No Attempt
28	Chocolate Game	No Attempt
29	The Prime Game	No Attempt
30	Vertical Rooks	No Attempt
31	A stones game	No Attempt
32	Tastes Like Winning	No Attempt

NP Complete

#	Challenge	Solution
1	Walking the Approximate Longest Path	No Attempt
2	Sam's Puzzle (Approximate)	No Attempt
3	Spies, Revised	No Attempt
4	TBS Problem	No Attempt

Debugging

#	Challenge	Solution
1	Prime Dates	No Attempt
2	XOR Strings	No Attempt
3	Smart Number	No Attempt
4	Minimum Operations	No Attempt
5	Zig Zag Sequence	No Attempt

Data Structures

• Arrays (0/6)
• Linked Lists (0/15)
• Trees (0/17)
• Balanced Trees (0/3)
• Stacks (0/9)
• Queues (0/5)
• Heap (0/4)
• Disjoint Set (0/4)
• Multiple Choice (0/3)
• Trie (0/2)
• Advanced (0/53)

Arrays

#	Challenge	Solution
1	Arrays - DS	No Attempt
2	2D Array - DS	No Attempt
3	Dynamic Array	No Attempt
4	Left Rotation	No Attempt
5	Sparse Arrays	No Attempt
6	Array Manipulation	No Attempt

Linked Lists

#	Challenge	Solution
1	Print the Elements of a Linked List	No Attempt
2	Insert a Node at the Tail of a Linked List	No Attempt
3	Insert a node at the head of a linked list	No Attempt
4	Insert a node at a specific position in a linked list	No Attempt
5	Delete a Node	No Attempt
6	Print in Reverse	No Attempt
7	Reverse a linked list	No Attempt
8	Compare two linked lists	No Attempt
9	Merge two sorted linked lists	No Attempt
10	Get Node Value	No Attempt
11	Delete duplicate-value nodes from a sorted linked list	No Attempt
12	Cycle Detection	No Attempt
13	Find Merge Point of Two Lists	No Attempt
14	Inserting a Node Into a Sorted Doubly Linked List	No Attempt
15	Reverse a doubly linked list	No Attempt

Trees

#	Challenge	Solution
1	Tree: Preorder Traversal	No Attempt
2	Tree: Postorder Traversal	No Attempt
3	Tree: Inorder Traversal	No Attempt
4	Tree: Height of a Binary Tree	No Attempt
5	Tree : Top View	No Attempt
6	Tree: Level Order Traversal	No Attempt
7	Binary Search Tree : Insertion	No Attempt
8	Tree: Huffman Decoding	No Attempt
9	Binary Search Tree : Lowest Common Ancestor	No Attempt
10	Swap Nodes [Algo]	No Attempt
11	Kitty's Calculations on a Tree	No Attempt
12	Is This a Binary Search Tree?	No Attempt
13	Square-Ten Tree	No Attempt
14	Balanced Forest	No Attempt
15	Jenny's Subtrees	No Attempt
16	Tree Coordinates	No Attempt
17	Array Pairs	No Attempt

Balanced Trees

#	Challenge	Solution
1	Self Balancing Tree	No Attempt
2	Array and simple queries	No Attempt
3	Median Updates	No Attempt

Stacks

#	Challenge	Solution
1	Maximum Element	No Attempt
2	Balanced Brackets	No Attempt
3	Equal Stacks	No Attempt
4	Game of Two Stacks	No Attempt
5	Largest Rectangle	No Attempt
6	Simple Text Editor	No Attempt
7	Poisonous Plants	No Attempt
8	AND xor OR	No Attempt
9	Waiter	No Attempt

Queues

#	Challenge	Solution
1	Queue using Two Stacks	No Attempt
2	Castle on the Grid	No Attempt
3	Down to Zero II	No Attempt
4	Truck Tour	No Attempt
5	Queries with Fixed Length	No Attempt

Heap

#	Challenge	Solution
1	QHEAP1	No Attempt
2	Jesse and Cookies	No Attempt
3	Find the Running Median	No Attempt
4	Minimum Average Waiting Time	No Attempt

Disjoint Set

#	Challenge	Solution
1	Merging Communities	No Attempt
2	Components in a graph	No Attempt
3	Kundu and Tree	No Attempt
4	Super Maximum Cost Queries	No Attempt

Multiple Choice

#	Challenge	Solution
1	Data Structures MCQ 1	No Attempt
2	Data Structures MCQ 2	No Attempt
3	Data Structures MCQ 3	No Attempt

Trie

#	Challenge	Solution
1	Contacts	No Attempt
2	No Prefix Set	No Attempt

Advanced

#	Challenge	Solution
1	Kindergarten Adventures	No Attempt
2	Cube Summation	No Attempt
3	Mr. X and His Shots	No Attempt
4	Direct Connections	No Attempt
5	Subsequence Weighting	No Attempt
6	Jim and the Skyscrapers	No Attempt
7	Palindromic Subsets	No Attempt
8	Counting On a Tree	No Attempt
9	Polynomial Division	No Attempt
10	Costly Intervals	No Attempt
11	The Strange Function	No Attempt
12	Self-Driving Bus	No Attempt
13	Unique Colors	No Attempt
14	Fibonacci Numbers Tree	No Attempt
15	Pair Sums	No Attempt
16	Functional Palindromes	No Attempt
17	Lazy White Falcon	No Attempt
18	Ticket to Ride	No Attempt
19	Heavy Light White Falcon	No Attempt
20	Sum of the Maximums	No Attempt
21	Number Game on a Tree	No Attempt
22	Heavy Light 2 White Falcon	No Attempt
23	Library Query	No Attempt
24	Starfleet	No Attempt
25	Almost Equal - Advanced	No Attempt
26	Almost sorted interval	No Attempt
27	Burger Happiness	No Attempt
28	Roy and alpha-beta trees	No Attempt
29	Coloring Tree	No Attempt
30	Recalling Early Days GP with Trees	No Attempt
31	Swaps and Sum	No Attempt
32	Arithmetic Progressions	No Attempt
33	Coolguy and Two Subsequences	No Attempt
34	White Falcon And Tree	No Attempt
35	Subtrees And Paths	No Attempt
36	Triplets	No Attempt
37	Beautiful Segments	No Attempt
38	Divisibility	No Attempt
39	BST maintenance	No Attempt
40	Find Maximum Index Product	No Attempt
41	Taxicab Driver's Problem	No Attempt
42	Jaggu Playing with Balloons	No Attempt
43	Dynamic Summation	No Attempt
44	Two Array Problem	No Attempt
45	Rooted Tree	No Attempt
46	The crazy helix	No Attempt
47	Network administration	No Attempt
48	Easy Addition	No Attempt
49	Find the permutation	No Attempt
50	Company Retreat	No Attempt
51	Box Operations	No Attempt
52	Max Transform	No Attempt
53	Array and Queries	No Attempt

Mathematics

• Fundamentals (0/32)
• Number Theory (0/76)
• Combinatorics (0/57)
• Algebra (0/43)
• Geometry (0/30)
• Probability (0/28)
• Linear Algebra Foundations (0/17)

Fundamentals

#	Challenge	Solution
1	Find the Point	No Attempt
2	Maximum Draws	No Attempt
3	Handshake	No Attempt
4	Minimum Height Triangle	No Attempt
5	Army Game	No Attempt
6	Leonardo's Prime Factors	No Attempt
7	Connecting Towns	No Attempt
8	Cutting Paper Squares	No Attempt
9	Summing the N series	No Attempt
10	Sherlock and Moving Tiles	No Attempt
11	Best Divisor	No Attempt
12	Restaurant	No Attempt
13	Reverse Game	No Attempt
14	Strange Grid Again	No Attempt
15	Diwali Lights	No Attempt
16	Sherlock and Divisors	No Attempt
17	Sherlock and Permutations	No Attempt
18	Even Odd Query	No Attempt
19	Special Multiple	No Attempt
20	Matrix Tracing	No Attempt
21	Die Hard 3	No Attempt
22	Halloween party	No Attempt
23	Filling Jars	No Attempt
24	Is Fibo	No Attempt
25	K Candy Store	No Attempt
26	Sumar and the Floating Rocks	No Attempt
27	Russian Peasant Exponentiation	No Attempt
28	Bus Station	No Attempt
29	Most Distant	No Attempt
30	Jim and the Jokes	No Attempt
31	Possible Path	No Attempt
32	Mutual Recurrences	No Attempt

Number Theory

#	Challenge	Solution
1	Constructing a Number	No Attempt
2	Closest Number	No Attempt
3	Sherlock and GCD	No Attempt
4	Primitive Problem	No Attempt
5	Identify Smith Numbers	No Attempt
6	Euler's Criterion	No Attempt
7	Twins	No Attempt
8	Fibonacci Finding (easy)	No Attempt
9	Little Panda Power	No Attempt
10	Mehta and his Laziness	No Attempt
11	Minimal Distance to Pi	No Attempt
12	Help Mike	No Attempt
13	Dancing in Pairs	No Attempt
14	The Chosen One	No Attempt
15	Power of large numbers	No Attempt
16	Salary Blues	No Attempt
17	Akhil and GF	No Attempt
18	Little Ashish's Huge Donation	No Attempt
19	Manasa and Factorials	No Attempt
20	Number of zero-xor subsets	No Attempt
21	Breaking Sticks	No Attempt
22	Cheese and Random Toppings	No Attempt
23	Easy GCD	No Attempt
24	Satisfactory Pairs	No Attempt
25	Manasa loves Maths	No Attempt
26	Largest Non-Coprime Submatrix	No Attempt
27	John and GCD list	No Attempt
28	Divisor Exploration II	No Attempt
29	Strange numbers	No Attempt
30	Easy math	No Attempt
31	Equations	No Attempt
32	Binomial Coefficients	No Attempt
33	Lucy and Flowers	No Attempt
34	Divisor Exploration 3	No Attempt
35	Superpowers of 2	No Attempt
36	Sherlock Puzzle	No Attempt
37	Divisibility of Power	No Attempt
38	Devu Vs Police	No Attempt
39	A Weird Function	No Attempt
40	Coprime Conundrum	No Attempt
41	Long Permutation	No Attempt
42	Megaprime Numbers	No Attempt
43	Divisor Exploration	No Attempt
44	Ants	No Attempt
45	Ichigo and Cubes	No Attempt
46	Scalar Products	No Attempt
47	Prime Sum	No Attempt
48	Number of M-Coprime Arrays	No Attempt
49	Hyperrectangle GCD	No Attempt
50	nCr	No Attempt
51	Chandrima and XOR	No Attempt
52	Find The Operations	No Attempt
53	Fibonacci GCD	No Attempt
54	Ichigo and Rooms	No Attempt
55	A Very Special Multiple	No Attempt
56	Fibonacci LCM	No Attempt
57	Unfriendly Numbers	No Attempt
58	HackerRank Number	No Attempt
59	Ajob Subsequence	No Attempt
60	GCD Product	No Attempt
61	The Bouncing Flying Ball	No Attempt
62	Eugene and Big Number	No Attempt
63	Matrix Tree	No Attempt
64	Period	No Attempt
65	Nice Clique	No Attempt
66	Order of Prime in Factorial	No Attempt
67	Degree of an algebraic number	No Attempt
68	Computer Virus	No Attempt
69	GCD Sequence	No Attempt
70	Coprime Power Sum	No Attempt
71	Fun with 1010	No Attempt
72	GCD mocktail	No Attempt
73	Laser Beam	No Attempt
74	Down the Rabbit Hole	No Attempt
75	Minion of the Year	No Attempt
76	Bear And Cryptography	No Attempt

Combinatorics

#	Challenge	Solution
1	nCr table	No Attempt
2	Coinage	No Attempt
3	Building a List	No Attempt
4	Merge List	No Attempt
5	A Chocolate Fiesta	No Attempt
6	Mehta and the Typical Supermarket	No Attempt
7	Choose and Calculate	No Attempt
8	Sherlock and Pairs	No Attempt
9	Consecutive Subsequences	No Attempt
10	Anti-Palindromic Strings	No Attempt
11	Lexicographic paths	No Attempt
12	Number List	No Attempt
13	Game Of Thrones - II	No Attempt
14	Journey to Mars	No Attempt
15	Super Humble Matrix	No Attempt
16	Volleyball Match	No Attempt
17	Picking Cards	No Attempt
18	Cyclic Quadruples	No Attempt
19	Permutation Problem	No Attempt
20	Longest Increasing Subsequence Arrays	No Attempt
21	Digit Products	No Attempt
22	Towers	No Attempt
23	Introduction to Representation Theory	No Attempt
24	Tile Painting: Revisited!	No Attempt
25	Beautiful Sets	No Attempt
26	Alien Flowers	No Attempt
27	Tower 3-coloring	No Attempt
28	Count Fox Sequences	No Attempt
29	Manasa and Combinatorics	No Attempt
30	Coloring Grid	No Attempt
31	Grid Lines	No Attempt
32	Div and Span	No Attempt
33	Highway Construction	No Attempt
34	Value of all Permutations	No Attempt
35	Farmer	No Attempt
36	Irresponsible Numbers	No Attempt
37	Academy Surveillance	No Attempt
38	Parity Party	No Attempt
39	Ichigo and Revenge	No Attempt
40	String Modification	No Attempt
41	Binomial Coefficients Revenge	No Attempt
42	Circles Math	No Attempt
43	To Heap or Not to Heap	No Attempt
44	Sasha and Swaps	No Attempt
45	k-balance number	No Attempt
46	Powercode	No Attempt
47	Insane DFS	No Attempt
48	How Many Trees?	No Attempt
49	Strongly Connected Digraphs	No Attempt
50	Robanukkah Tree	No Attempt
51	Teleporters	No Attempt
52	Costly Graphs	No Attempt
53	Bridges and Harbors	No Attempt
54	Count Palindromes	No Attempt
55	Cycle Representation	No Attempt
56	To Infinity and Beyond	No Attempt
57	Byteland Itinerary	No Attempt

Algebra

#	Challenge	Solution
1	Combo Meal	No Attempt
2	Stepping Stones Game	No Attempt
3	Shashank and List	No Attempt
4	Triangle Numbers	No Attempt
5	Little Gaurav and Sequence	No Attempt
6	Easy sum	No Attempt
7	Difference and Product	No Attempt
8	Pythagorean Triple	No Attempt
9	Pairwise Sum and Divide	No Attempt
10	Number Groups	No Attempt
11	Tell the Average	No Attempt
12	Game Of Rotation	No Attempt
13	Hackonacci Matrix Rotations	No Attempt
14	Power Calculation	No Attempt
15	Wet Shark and 42	No Attempt
16	Sherlock and Square	No Attempt
17	Birthday Triplets	No Attempt
18	Sherlock and Queries	No Attempt
19	Manasa and Sub-sequences	No Attempt
20	Count Solutions	No Attempt
21	Summing the K-N series	No Attempt
22	XOR love	No Attempt
23	Manasa and Calculations	No Attempt
24	Simple One	No Attempt
25	The Simplest Sum	No Attempt
26	Circle Summation	No Attempt
27	Girlfriend & Necklace	No Attempt
28	Manasa and Pizza	No Attempt
29	Signal Tower	No Attempt
30	Summing the K-N-R Series	No Attempt
31	The Axis of Awesome	No Attempt
32	Emma and sum of products	No Attempt
33	Fun With Series	No Attempt
34	Permutation Equations	No Attempt
35	Counting Equations	No Attempt
36	Calculate It	No Attempt
37	Rational Sums	No Attempt
38	Introduction to Algebra	No Attempt
39	Cross Matrix	No Attempt
40	Introduction to Algebra 2	No Attempt
41	The Black Box	No Attempt
42	Black Hole	No Attempt
43	Minimal Cyclic Shift	No Attempt

Geometry

#	Challenge	Solution
1	Points On a Line	No Attempt
2	Rectangular Game	No Attempt
3	Sherlock and Counting	No Attempt
4	Sherlock and Planes	No Attempt
5	Circle City	No Attempt
6	Xrange's Pancakes	No Attempt
7	Spheres	No Attempt
8	Baby Step, Giant Step	No Attempt
9	Points on a Rectangle	No Attempt
10	A Circle and a Square	No Attempt
11	Jim Beam	No Attempt
12	Hyperspace Travel	No Attempt
13	Solve Equations	No Attempt
14	Stars	No Attempt
15	Polar Angles	No Attempt
16	Sherlock and Geometry	No Attempt
17	Good Point	No Attempt
18	Hard Homework	No Attempt
19	Polygons	No Attempt
20	Polygon	No Attempt
21	Meeting Point	No Attempt
22	House Location	No Attempt
23	Jim and the Challenge	No Attempt
24	The Letter N	No Attempt
25	Best Sum	No Attempt
26	Geometry Queries	No Attempt
27	Count Triangles	No Attempt
28	Isosceles Triangles	No Attempt
29	Elastic rope	No Attempt
30	Painting Figures	No Attempt

Probability

#	Challenge	Solution
1	Random number generator	No Attempt
2	Sherlock and Probability	No Attempt
3	Day 4: Normal Distribution #1	No Attempt
4	Day 4: Normal Distribution #2	No Attempt
5	Vertical Sticks	No Attempt
6	Normal Distribution #3	No Attempt
7	B'day Gift	No Attempt
8	Extremely Dangerous Virus	No Attempt
9	The Matchstick Experiment	No Attempt
10	Palindromes	No Attempt
11	Lazy Sorting	No Attempt
12	Binomial Distribution #1	No Attempt
13	Binomial Distribution #2	No Attempt
14	Binomial Distribution #3	No Attempt
15	Kevin and Expected Value	No Attempt
16	The White Lotus and Caterpillar game	No Attempt
17	Assignment Problem	No Attempt
18	Connect the country	No Attempt
19	Random Integers Random Bits	No Attempt
20	Dice Stats	No Attempt
21	Magic Number Tree	No Attempt
22	Random Number Generator	No Attempt
23	Zombie March***	No Attempt
24	Bear and Dancing	No Attempt
25	Randomness	No Attempt
26	Random	No Attempt
27	Mathematical Expectation	No Attempt
28	Colorful Polygon	No Attempt

Linear Algebra Foundations

#	Challenge	Solution
1	Linear Algebra Foundations #1 - Matrix Addition	No Attempt
2	Linear Algebra Foundations #2 - Matrix Subtraction	No Attempt
3	Linear Algebra Foundations #3- Matrix Multiplication	No Attempt
4	Linear Algebra Foundations #4- Matrix Multiplication	No Attempt
5	Linear Algebra Foundations #5 - The 100th Power of a Matrix	No Attempt
6	Linear Algebra Foundations #6 - An Equation involving Matrices	No Attempt
7	Linear Algebra Foundations #7 - The 1000th Power of a Matrix	No Attempt
8	Linear Algebra Foundations #8 - Systems of Equations	No Attempt
9	Linear Algebra Foundations #9 - Eigenvalues	No Attempt
10	Linear Algebra Foundations #10 - Eigenvectors	No Attempt
11	Determinant of the matrix #1	No Attempt
12	Determinant of the matrix #2	No Attempt
13	Determinant of the matrix #3	No Attempt
14	Eigenvalue of a Matrix I	No Attempt
15	Eigenvalue of matrix #2	No Attempt
16	Eigenvalue of matrix #3	No Attempt
17	Eigenvalue of matrix #4	No Attempt