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Start training on this collection. Each time you skip or complete a kata you will be taken to the next kata in the series. Once you cycle through the items in the collection you will revert back to your normal training routine.

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Draft
Breadth First Tree Traversal
13332bits
Status:Draft
Estimated Rank:
6 kyu
Fundamentals
Data Structures
Binary Trees
5 kyu
Binary Tree Traversal
1,948Ban-Ath
Binary Trees
Trees
Recursion
Data Structures
Algorithms
5 kyu
Binary search tree validation
950plastic
Trees
Recursion
Data Structures
Algorithms
6 kyu
Sum The Tree
4,720jz9000
Trees
Recursion
Binary Trees
Binary Search Trees
Data Structures
Fundamentals
5 kyu
Tree to list
962mlyundin
Trees
Fundamentals
6 kyu
Binary Tree Compare
1,828bovard
Binary Trees
Algorithms
4 kyu
Sort binary tree by levels
13,188kars7e
Trees
Binary Trees
Performance
Algorithms
Sorting
4 kyu
Determining if a graph has a solution
1,487damned3
Algorithms
Data Structures
Graph Theory
6 kyu
Fun with trees: max sum
4,107janitormeir
Trees
Recursion
Binary Trees
Binary Search Trees
Data Structures
Algorithms
5 kyu
Fun with trees: array to tree
3,306janitormeir
Trees
Arrays
Binary Trees
Data Structures
Algorithms
6 kyu
Balance the tree
127ykagan
Trees
Data Structures
Algorithms
6 kyu
Reverse polish notation calculator
11,200vgrichina
Algorithms
Mathematics
Interpreters
Parsing
Strings
6 kyu
Evaluating prefix Polish notation
604interphx
Parsing
Mathematics
Algorithms
Lists
Strings
Fundamentals
6 kyu
Pairing brackets
351jmossel
Strings
Parsing
Algorithms
6 kyu
Maximum Depth of Nested Brackets
521nachoMonllor
Strings
Performance
Algorithms
6 kyu
Cross the Bridges
73Jomopipi
Performance
Algorithms
Graph Theory
Retired
Transform the graph (retired)
50nevepura
Status:Retired
Estimated Rank:
6 kyu
Data Structures
Algorithms
Beta
The Seven Bridges of Königsberg
20LesterJones
Status:Waiting for issues to be resolved
Estimated Rank:
5 kyu
Graph Theory
Fundamentals
Discrete Mathematics
Algorithms
6 kyu
Implementing a Queue - Performance Version
212Souzooka
Queues
Data Structures
Fundamentals
6 kyu
The Supermarket Queue
51,187mattlub
Arrays
Fundamentals
7 kyu
LinkedList -> Array
5,118nivrad00
Data Structures
Arrays
Fundamentals
7 kyu
Fun with lists: length
3,333janitormeir
Lists
Fundamentals
6 kyu
Fun with lists: countIf
1,532janitormeir
Lists
Functional Programming
Fundamentals
7 kyu
Fun with lists: indexOf
1,956janitormeir
Lists
Fundamentals
7 kyu
Fun with lists: lastIndexOf
1,711janitormeir
Lists
Fundamentals
7 kyu
Fun with lists: anyMatch + allMatch
1,099janitormeir
Lists
Functional Programming
Fundamentals
6 kyu
Linked Lists - Length & Count
9,849JDeBolt
Linked Lists
Data Structures
Fundamentals
7 kyu
Linked Lists - Get Nth Node
5,542JDeBolt
Linked Lists
Data Structures
Fundamentals
7 kyu
Linked Lists - Append
3,013JDeBolt
Linked Lists
Data Structures
Fundamentals
6 kyu
Linked Lists - Insert Nth Node
2,640JDeBolt
Linked Lists
Data Structures
Fundamentals
6 kyu
Linked Lists - Sorted Insert
2,307JDeBolt
Linked Lists
Data Structures
Fundamentals
6 kyu
Linked Lists - Insert Sort
1,144JDeBolt
Linked Lists
Data Structures
Fundamentals
Sorting
6 kyu
Linked Lists - Recursive Reverse
910JDeBolt
Linked Lists
Data Structures
Algorithms
6 kyu
Simple string indices
2,269KenKamau
Strings
Algorithms
6 kyu
Remove the parentheses
6,765topping
Strings
Algorithms
Regular Expressions
Fundamentals
6 kyu
Backspaces in string
18,413vetalpaprotsky
Fundamentals
Strings
Algorithms
4 kyu
Simple maze
951eugene-katsevman
Queues
Recursion
Algorithms
Draft
Maze Path Finder
5derDere
Status:Draft
Estimated Rank:
1 kyu
Draft
Through the Maze
24franzmoro88
Status:Draft
Estimated Rank:
4 kyu
Arrays
Strings
6 kyu
Count the Islands
528SteveRuble
Algorithms
Graphics
Arrays
6 kyu
Island Count
243finetype
Puzzles
6 kyu
Connected blocks
123surtich
Arrays
Algorithms
5 kyu
Simple Fun #155: Pac-Man
265myjinxin2015
Algorithms
Puzzles
5 kyu
Flood Fill
282chris_w
Algorithms
Fundamentals
Arrays
5 kyu
Bird Mountain
1,784dinglemouse
Algorithms
Graph Theory
Retired
Escape the Mines ! (retired)
2,510damned3
Data Structures
Algorithms
Puzzles
Graph Theory
Draft
Escape from Bank
16anton-gorbikov
Status:Draft
Estimated Rank:
3 kyu
Graph Theory
Algorithms
5 kyu
Topological Image Processing: 4-Connected Components
142Dr Gabo
Image Processing
Mathematics
Algorithms
5 kyu
Treasure hunt
60KennyTangHK
Algorithms
Retired
Practical Interview Prep: Binary Search Tree .contains() (retired)
31ish2f4f
Status:Retired
Estimated Rank:
6 kyu
Binary Search Trees
Data Structures
Trees
Fundamentals
7 kyu
Flatten Me
712ethanhan2013
Fundamentals
6 kyu
Nested List Depth
1,408Nmistrata
Lists
Algorithms
7 kyu
Flatten
12,565xcthulhu
Functional Programming
Arrays
Fundamentals
5 kyu
flatten()
4,433jhoffner
Arrays
Algorithms
7 kyu
Sum of a nested list
2,829kingcobra
Recursion
Lists
Algorithms
Fundamentals
6 kyu
Array Deep Count
12,942hannahcmtucker
Arrays
Recursion
Fundamentals
6 kyu
Deep List Reverse
261ArcaneIntegers
Mathematics
Arrays
Algorithms
Retired
Flatten Object (retired)
27AO16
Status:Retired
Fundamentals
Beta
Tile Map Path Finding
9Mackay
Status:Testing & feedback needed
Estimated Rank:
6 kyu
Games
Algorithms
Puzzles
5 kyu
Maze Solver
153funnbot
Algorithms
4 kyu
Escape the maze
813cyril-lemaire
Fundamentals
Algorithms
Retired
Cheapest route (Toll roads included) (retired)
11MrTurtle
Status:Retired
Estimated Rank:
3 kyu
Algorithms
Draft
Dijkstra's shortest path algorithm
4mdanok
Status:Draft
Estimated Rank:
5 kyu
Algorithms
Mathematics
Arrays
Draft
Boggle solver
38Golmote
Status:Draft
Estimated Rank:
4 kyu
Games
4 kyu
Boggle Word Checker
3,549evan-eleven
Arrays
Recursion
Puzzles
Draft
The Shortest Routes
25unihernandez22
Status:Draft
Estimated Rank:
5 kyu
Graphs
Draft
Percolate? Drip Filter!
6EdgyEdgemond
Status:Draft
Estimated Rank:
3 kyu
5 kyu
Optimized Pathfinding Algorithm
122ByteSheep
Games
Algorithms
Puzzles
Draft
Finding the path of a river
8myst-6
Status:Draft
Estimated Rank:
5 kyu
Algorithms
Puzzles
Fundamentals
Arrays
6 kyu
Treebeard #Determine Tree Age
142smolen
Recursion
Arrays
Fundamentals
5 kyu
Molecule to atoms
5,879romanzes
Parsing
Algorithms
Strings
5 kyu
All that is open must be closed...
1,412ChristianECooper
Stacks
Parsing
Algorithms
Regular Expressions
5 kyu
Simple parenthesis removal
466KenKamau
Strings
Logic
Algorithms
Retired
Calculator (retired)
11,547obrok
Algorithms
Parsing
Logic
Strings
Expressions
Basic Language Features
Fundamentals
6 kyu
Get root property name
438kodejuice
Data Structures
Fundamentals
5 kyu
Hungry Hippos
429adrian.eyre
Games
Arrays
Fundamentals
6 kyu
Needles in a haystack
356NiklasE
Algorithms
Fundamentals
6 kyu
File Finder
180phantamanta44
Recursion
Algorithms
6 kyu
Smart Sum
1,450nathan-lapinski
Arrays
Recursion
Fundamentals
Retired
Chemical Name (retired)
36Admiraal
Status:Retired
Estimated Rank:
6 kyu
Algorithms
Retired
Split non spaced string to words (retired)
54chanansh
Status:Retired
Estimated Rank:
5 kyu
Strings
Dynamic Programming
Algorithms
4 kyu
Elemental Words
888dcsmith
Strings
Algorithms
Recursion
Arrays
6 kyu
Linked Lists - Remove Duplicates
2,125JDeBolt
Linked Lists
Data Structures
Fundamentals
7 kyu
Linked Lists - Move Node
1,669JDeBolt
Linked Lists
Data Structures
Fundamentals