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‎misc/ChallengeGroups.md

+103-103
Original file line numberDiff line numberDiff line change
@@ -7,175 +7,175 @@ type of problem (searching, sorting etc.). One challenge may fit int outfile gro
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List of problems that can be solved using [recursion](https://en.wikipedia.org/wiki/Recursion_(computer_science)).
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10-
- [Count down](../src/test/kotlin/com/igorwojda/integer/countdown/README.md)
11-
- [Get odd](../src/test/kotlin/com/igorwojda/integer/getodd/README.md)
12-
- [Any callback](../src/test/kotlin/com/igorwojda/various/anycallback/README.md)
13-
- [Power](../src/test/kotlin/com/igorwojda/integer/power/README.md)
14-
- [Binary search tree (validate)](../src/test/kotlin/com/igorwojda/tree/binarytree/validate/README.md)
15-
- [Fibonacci](../src/test/kotlin/com/igorwojda/integer/fibonacci/basic/README.md)
16-
- [Fibonacci with recursive cache](../src/test/kotlin/com/igorwojda/integer/fibonacci/recursivecached/README.md)
17-
- [Add up to](../src/test/kotlin/com/igorwojda/integer/addupto/README.md)
18-
- [Is substring](../src/test/kotlin/com/igorwojda/string/issubstring/README.md)
19-
- [Capitalize first](../src/test/kotlin/com/igorwojda/list/capitalizeFirst/README.md)
20-
- [Merge sort](../src/test/kotlin/com/igorwojda/list/sort/mergesort/README.md)
21-
- [Quick sort](../src/test/kotlin/com/igorwojda/list/sort/quicksort/README.md)
10+
- [Count down](../src/test/kotlin/com/igorwojda/integer/countdown)
11+
- [Get odd](../src/test/kotlin/com/igorwojda/integer/getodd)
12+
- [Any callback](../src/test/kotlin/com/igorwojda/various/anycallback)
13+
- [Power](../src/test/kotlin/com/igorwojda/integer/power)
14+
- [Binary search tree (validate)](../src/test/kotlin/com/igorwojda/tree/binarytree/validate)
15+
- [Fibonacci](../src/test/kotlin/com/igorwojda/integer/fibonacci/basic)
16+
- [Fibonacci with recursive cache](../src/test/kotlin/com/igorwojda/integer/fibonacci/recursivecached)
17+
- [Add up to](../src/test/kotlin/com/igorwojda/integer/addupto)
18+
- [Is substring](../src/test/kotlin/com/igorwojda/string/issubstring)
19+
- [Capitalize first](../src/test/kotlin/com/igorwojda/list/capitalizeFirst)
20+
- [Merge sort](../src/test/kotlin/com/igorwojda/list/sort/mergesort)
21+
- [Quick sort](../src/test/kotlin/com/igorwojda/list/sort/quicksort)
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### Recursion with helper function
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Recurrent helper function is useful when we want to solve problem in recursive way, but we don't want to change client
2626
API by changing method signature of the original method eg. we don't want to add new parameters (additional data required
2727
for recursive call) or change return type (eg. change `List<Int>` to `MutableList<Int>`).
2828

29-
- [Get odd](../src/test/kotlin/com/igorwojda/integer/getodd/README.md)
30-
- [Count down](../src/test/kotlin/com/igorwojda/integer/countdown/README.md)
31-
- [Is substring](../src/test/kotlin/com/igorwojda/string/issubstring/README.md)
32-
- [Tree traversal](../src/test/kotlin/com/igorwojda/tree/classic/traversal/README.md)
29+
- [Get odd](../src/test/kotlin/com/igorwojda/integer/getodd)
30+
- [Count down](../src/test/kotlin/com/igorwojda/integer/countdown)
31+
- [Is substring](../src/test/kotlin/com/igorwojda/string/issubstring)
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- [Tree traversal](../src/test/kotlin/com/igorwojda/tree/classic/traversal)
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## Double pointer
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3636
Problem solved by using double variable pointing to various indexes of the list. We use double pointer instead of nested
3737
loops which decreases complexity from `O(n^2)` to `O(n)`.
3838

39-
- [Sum zero](../src/test/kotlin/com/igorwojda/list/sumzero/README.md)
40-
- [Pair average](../src/test/kotlin/com/igorwojda/list/pairaverage/README.md)
41-
- [Is substring](../src/test/kotlin/com/igorwojda/string/issubstring/README.md)
42-
- [Get duplicated arguments](../src/test/kotlin/com/igorwojda/string/getduplicatedarguments/README.md)
43-
- [Midpoint](../src/test/kotlin/com/igorwojda/linkedlist/singly/midpoint/README.md)
44-
- [Circular check](../src/test/kotlin/com/igorwojda/linkedlist/singly/circularcheck/README.md)
45-
- [Medan Of Sorted Lists](../src/test/kotlin/com/igorwojda/list/medianoftwosorted/README.md)
39+
- [Sum zero](../src/test/kotlin/com/igorwojda/list/sumzero)
40+
- [Pair average](../src/test/kotlin/com/igorwojda/list/pairaverage)
41+
- [Is substring](../src/test/kotlin/com/igorwojda/string/issubstring)
42+
- [Get duplicated arguments](../src/test/kotlin/com/igorwojda/string/getduplicatedarguments)
43+
- [Midpoint](../src/test/kotlin/com/igorwojda/linkedlist/singly/midpoint)
44+
- [Circular check](../src/test/kotlin/com/igorwojda/linkedlist/singly/circularcheck)
45+
- [Medan Of Sorted Lists](../src/test/kotlin/com/igorwojda/list/medianoftwosorted)
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4747
## Frequency counter
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4949
Problems solved by counting occurrence of element. We use frequency counter instead of nested loops which decreases
5050
complexity from `O(n^2)` to `O(n)`.
5151

52-
- [Count unique values](../src/test/kotlin/com/igorwojda/list/countuniquevalues/README.md)
53-
- [Is anagram](../src/test/kotlin/com/igorwojda/string/isanagram/README.md)
54-
- [Square equals](../src/test/kotlin/com/igorwojda/list/squareequal/README.md)
55-
- [Digit frequency](../src/test/kotlin/com/igorwojda/integer/digitfrequency/README.md)
56-
- [Max occurring char](../src/test/kotlin/com/igorwojda/string/maxoccurringchar/README.md)
57-
- [Get duplicated arguments](../src/test/kotlin/com/igorwojda/string/getduplicatedarguments/README.md)
58-
- [Subtract](../src/test/kotlin/com/igorwojda/list/subtract/README.md)
59-
- [Has repeated char](../src/test/kotlin/com/igorwojda/string/hasrepeatedcharacter/README.md)
52+
- [Count unique values](../src/test/kotlin/com/igorwojda/list/countuniquevalues)
53+
- [Is anagram](../src/test/kotlin/com/igorwojda/string/isanagram)
54+
- [Square equals](../src/test/kotlin/com/igorwojda/list/squareequal)
55+
- [Digit frequency](../src/test/kotlin/com/igorwojda/integer/digitfrequency)
56+
- [Max occurring char](../src/test/kotlin/com/igorwojda/string/maxoccurringchar)
57+
- [Get duplicated arguments](../src/test/kotlin/com/igorwojda/string/getduplicatedarguments)
58+
- [Subtract](../src/test/kotlin/com/igorwojda/list/subtract)
59+
- [Has repeated char](../src/test/kotlin/com/igorwojda/string/hasrepeatedcharacter)
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## Sliding window
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6363
We use sliding window instead of nested loops which decreases complexity from `O(n^2)` to `O(n)`.
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65-
- [Max sub list sum](../src/test/kotlin/com/igorwojda/list/maxsublistsum/README.md)
66-
- [Min sub list length](../src/test/kotlin/com/igorwojda/list/minsublistlength/README.md)
65+
- [Max sub list sum](../src/test/kotlin/com/igorwojda/list/maxsublistsum)
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- [Min sub list length](../src/test/kotlin/com/igorwojda/list/minsublistlength)
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6868
## List
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7070
### Search algorithms
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72-
- [Linear search](../src/test/kotlin/com/igorwojda/list/search/linearsearch/README.md)
73-
- [Binary search](../src/test/kotlin/com/igorwojda/list/search/binarysearch/README.md)
72+
- [Linear search](../src/test/kotlin/com/igorwojda/list/search/linearsearch)
73+
- [Binary search](../src/test/kotlin/com/igorwojda/list/search/binarysearch)
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7575
### Sort algorithms
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77-
- [Bubble sort](../src/test/kotlin/com/igorwojda/list/sort/bubblesort/README.md)
78-
- [Merge sort](../src/test/kotlin/com/igorwojda/list/sort/mergesort/README.md)
79-
- [Selection sort](../src/test/kotlin/com/igorwojda/list/sort/selectionsort/README.md)
80-
- [Insertion sort](../src/test/kotlin/com/igorwojda/list/sort/insertionsort/README.md)
81-
- [Quick sort](../src/test/kotlin/com/igorwojda/list/sort/quicksort/README.md)
82-
- [Radix sort](../src/test/kotlin/com/igorwojda/list/sort/radixsort/README.md)
77+
- [Bubble sort](../src/test/kotlin/com/igorwojda/list/sort/bubblesort)
78+
- [Merge sort](../src/test/kotlin/com/igorwojda/list/sort/mergesort)
79+
- [Selection sort](../src/test/kotlin/com/igorwojda/list/sort/selectionsort)
80+
- [Insertion sort](../src/test/kotlin/com/igorwojda/list/sort/insertionsort)
81+
- [Quick sort](../src/test/kotlin/com/igorwojda/list/sort/quicksort)
82+
- [Radix sort](../src/test/kotlin/com/igorwojda/list/sort/radixsort)
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8484
### Other list challenges
8585

86-
- [Capitalize First](../src/test/kotlin/com/igorwojda/list/capitalizeFirst/README.md)
87-
- [Flatten](../src/test/kotlin/com/igorwojda/list/flatten/README.md)
88-
- [Chunk](../src/test/kotlin/com/igorwojda/list/chunk/README.md)
89-
- [Max sub-list sum](../src/test/kotlin/com/igorwojda/list/maxsublistsum/README.md)
90-
- [Min sub-list length](../src/test/kotlin/com/igorwojda/list/minsublistlength/README.md)
91-
- [Find the pair with average](../src/test/kotlin/com/igorwojda/list/pairaverage/README.md)
92-
- [Product](../src/test/kotlin/com/igorwojda/list/product/README.md)
93-
- [Square compare](../src/test/kotlin/com/igorwojda/list/squareequal/README.md)
94-
- [List subtract](../src/test/kotlin/com/igorwojda/list/subtract/README.md)
95-
- [Sum zero](../src/test/kotlin/com/igorwojda/list/sumzero/README.md)
96-
- [Coins](src/test/kotlin/com/igorwojda/list/coins/README.md)
86+
- [Capitalize First](../src/test/kotlin/com/igorwojda/list/capitalizeFirst)
87+
- [Flatten](../src/test/kotlin/com/igorwojda/list/flatten)
88+
- [Chunk](../src/test/kotlin/com/igorwojda/list/chunk)
89+
- [Max sub-list sum](../src/test/kotlin/com/igorwojda/list/maxsublistsum)
90+
- [Min sub-list length](../src/test/kotlin/com/igorwojda/list/minsublistlength)
91+
- [Find the pair with average](../src/test/kotlin/com/igorwojda/list/pairaverage)
92+
- [Product](../src/test/kotlin/com/igorwojda/list/product)
93+
- [Square compare](../src/test/kotlin/com/igorwojda/list/squareequal)
94+
- [List subtract](../src/test/kotlin/com/igorwojda/list/subtract)
95+
- [Sum zero](../src/test/kotlin/com/igorwojda/list/sumzero)
96+
- [Coins](src/test/kotlin/com/igorwojda/list/coins)
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9898
## Singly Linked List
9999

100-
- [Singly linked list](../src/test/kotlin/com/igorwojda/linkedlist/singly/base/README.md)
101-
- [Circular linked list?](../src/test/kotlin/com/igorwojda/linkedlist/singly/circularcheck/README.md)
102-
- [Take n-th element from last](../src/test/kotlin/com/igorwojda/linkedlist/singly/fromlast/README.md)
103-
- [Midpoint](../src/test/kotlin/com/igorwojda/linkedlist/singly/midpoint/README.md)
100+
- [Singly linked list](../src/test/kotlin/com/igorwojda/linkedlist/singly/base)
101+
- [Circular linked list?](../src/test/kotlin/com/igorwojda/linkedlist/singly/circularcheck)
102+
- [Take n-th element from last](../src/test/kotlin/com/igorwojda/linkedlist/singly/fromlast)
103+
- [Midpoint](../src/test/kotlin/com/igorwojda/linkedlist/singly/midpoint)
104104
- [Add Numbers](../src/test/kotlin/com/igorwojda/linkedlist/singly/addnumbers)
105105

106106
## Doubly Linked List
107107

108-
- [Doubly linked list](../src/test/kotlin/com/igorwojda/linkedlist/doubly/base/README.md)
108+
- [Doubly linked list](../src/test/kotlin/com/igorwojda/linkedlist/doubly/base)
109109

110110
## Binary tree
111111

112-
- [Binary Search Tree (insert)](../src/test/kotlin/com/igorwojda/tree/binarytree/insert/README.md)
113-
- [Binary Tree (validate)](../src/test/kotlin/com/igorwojda/tree/binarytree/validate/README.md)
112+
- [Binary Search Tree (insert)](../src/test/kotlin/com/igorwojda/tree/binarytree/insert)
113+
- [Binary Tree (validate)](../src/test/kotlin/com/igorwojda/tree/binarytree/validate)
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115115
## Integer
116116

117-
- [Add up to](../src/test/kotlin/com/igorwojda/integer/addupto/README.md)
118-
- [Count down](../src/test/kotlin/com/igorwojda/integer/countdown/README.md)
119-
- [Count up and down](../src/test/kotlin/com/igorwojda/integer/countupanddown/README.md)
120-
- [Digit frequency](../src/test/kotlin/com/igorwojda/integer/digitfrequency/README.md)
121-
- [Factorial](../src/test/kotlin/com/igorwojda/integer/factorial/README.md)
122-
- [Fibonacci](../src/test/kotlin/com/igorwojda/integer/fibonacci/basic/README.md)
123-
- [FizzBuzz](../src/test/kotlin/com/igorwojda/integer/fizzbuzz/README.md)
124-
- [Recursive cache fibonacci](../src/test/kotlin/com/igorwojda/integer/fibonacci/recursivecached/README.md)
125-
- [Generate all pairs](../src/test/kotlin/com/igorwojda/integer/generateallpairs/README.md)
126-
- [Get odd numbers](../src/test/kotlin/com/igorwojda/integer/getodd/README.md)
127-
- [Power](../src/test/kotlin/com/igorwojda/integer/power/README.md)
128-
- [Print numbers](../src/test/kotlin/com/igorwojda/integer/printnumber/basic/README.md)
129-
- [Print numbers with steps](../src/test/kotlin/com/igorwojda/integer/printnumber/steps/README.md)
130-
- [Pyramid generator](../src/test/kotlin/com/igorwojda/integer/pyramidgenerator/README.md)
131-
- [Reverse Int](../src/test/kotlin/com/igorwojda/integer/reverse/README.md)
132-
- [Steps generator](../src/test/kotlin/com/igorwojda/integer/stepsgenerator/README.md)
117+
- [Add up to](../src/test/kotlin/com/igorwojda/integer/addupto)
118+
- [Count down](../src/test/kotlin/com/igorwojda/integer/countdown)
119+
- [Count up and down](../src/test/kotlin/com/igorwojda/integer/countupanddown)
120+
- [Digit frequency](../src/test/kotlin/com/igorwojda/integer/digitfrequency)
121+
- [Factorial](../src/test/kotlin/com/igorwojda/integer/factorial)
122+
- [Fibonacci](../src/test/kotlin/com/igorwojda/integer/fibonacci/basic)
123+
- [FizzBuzz](../src/test/kotlin/com/igorwojda/integer/fizzbuzz)
124+
- [Recursive cache fibonacci](../src/test/kotlin/com/igorwojda/integer/fibonacci/recursivecached)
125+
- [Generate all pairs](../src/test/kotlin/com/igorwojda/integer/generateallpairs)
126+
- [Get odd numbers](../src/test/kotlin/com/igorwojda/integer/getodd)
127+
- [Power](../src/test/kotlin/com/igorwojda/integer/power)
128+
- [Print numbers](../src/test/kotlin/com/igorwojda/integer/printnumber/basic)
129+
- [Print numbers with steps](../src/test/kotlin/com/igorwojda/integer/printnumber/steps)
130+
- [Pyramid generator](../src/test/kotlin/com/igorwojda/integer/pyramidgenerator)
131+
- [Reverse Int](../src/test/kotlin/com/igorwojda/integer/reverse)
132+
- [Steps generator](../src/test/kotlin/com/igorwojda/integer/stepsgenerator)
133133

134134
## String
135135

136-
- [Caesar Cipher](../src/test/kotlin/com/igorwojda/string/caesarcipher/README.md)
137-
- [Capitalize sentence](../src/test/kotlin/com/igorwojda/string/capitalizesentence/README.md)
138-
- [Decapitalize const](../src/test/kotlin/com/igorwojda/string/decapitalizeconst/README.md)
139-
- [Get duplicated arguments](../src/test/kotlin/com/igorwojda/string/getduplicatedarguments/README.md)
140-
- [Has repeated char](../src/test/kotlin/com/igorwojda/string/hasrepeatedcharacter/README.md)
141-
- [Is anagram](../src/test/kotlin/com/igorwojda/string/isanagram/README.md)
142-
- [Is palindrome](../src/test/kotlin/com/igorwojda/string/ispalindrome/basic/README.md)
143-
- [Is tolerant palindrome](../src/test/kotlin/com/igorwojda/string/ispalindrome/tolerant/README.md)
144-
- [Is permutation palindrome](../src/test/kotlin/com/igorwojda/string/ispalindrome/permutation/README.md)
145-
- [Is substring](../src/test/kotlin/com/igorwojda/string/issubstring/README.md)
146-
- [Longest word](../src/test/kotlin/com/igorwojda/string/longestword/README.md)
147-
- [Max occurring char](../src/test/kotlin/com/igorwojda/string/maxoccurringchar/README.md)
148-
- [Reverse string](../src/test/kotlin/com/igorwojda/string/reverse/README.md)
149-
- [Surrounded letter](../src/test/kotlin/com/igorwojda/string/surroundedletter/README.md)
150-
- [Find the vowels](../src/test/kotlin/com/igorwojda/string/vowels/README.md)
151-
- [Format train route](../src/test/kotlin/com/igorwojda/list/formattrainroute/README.md)
136+
- [Caesar Cipher](../src/test/kotlin/com/igorwojda/string/caesarcipher)
137+
- [Capitalize sentence](../src/test/kotlin/com/igorwojda/string/capitalizesentence)
138+
- [Decapitalize const](../src/test/kotlin/com/igorwojda/string/decapitalizeconst)
139+
- [Get duplicated arguments](../src/test/kotlin/com/igorwojda/string/getduplicatedarguments)
140+
- [Has repeated char](../src/test/kotlin/com/igorwojda/string/hasrepeatedcharacter)
141+
- [Is anagram](../src/test/kotlin/com/igorwojda/string/isanagram)
142+
- [Is palindrome](../src/test/kotlin/com/igorwojda/string/ispalindrome/basic)
143+
- [Is tolerant palindrome](../src/test/kotlin/com/igorwojda/string/ispalindrome/tolerant)
144+
- [Is permutation palindrome](../src/test/kotlin/com/igorwojda/string/ispalindrome/permutation)
145+
- [Is substring](../src/test/kotlin/com/igorwojda/string/issubstring)
146+
- [Longest word](../src/test/kotlin/com/igorwojda/string/longestword)
147+
- [Max occurring char](../src/test/kotlin/com/igorwojda/string/maxoccurringchar)
148+
- [Reverse string](../src/test/kotlin/com/igorwojda/string/reverse)
149+
- [Surrounded letter](../src/test/kotlin/com/igorwojda/string/surroundedletter)
150+
- [Find the vowels](../src/test/kotlin/com/igorwojda/string/vowels)
151+
- [Format train route](../src/test/kotlin/com/igorwojda/list/formattrainroute)
152152

153153
## Matrix
154154

155-
- [Spiral matrix generator](../src/test/kotlin/com/igorwojda/matrix/spiralmatrixgenerator/README.md)
156-
- [Find rectangle](../src/test/kotlin/com/igorwojda/matrix/findrectangle/README.md)
155+
- [Spiral matrix generator](../src/test/kotlin/com/igorwojda/matrix/spiralmatrixgenerator)
156+
- [Find rectangle](../src/test/kotlin/com/igorwojda/matrix/findrectangle)
157157

158158
## Range
159159

160-
- [Contains range?](../src/test/kotlin/com/igorwojda/range/containsrange/README.md)
160+
- [Contains range?](../src/test/kotlin/com/igorwojda/range/containsrange)
161161

162162
## Queue
163163

164-
- [Queue](../src/test/kotlin/com/igorwojda/queue/basic/README.md)
165-
- [Combine two queues](../src/test/kotlin/com/igorwojda/queue/combine/README.md)
166-
- [Tree traversal](../src/test/kotlin/com/igorwojda/tree/classic/traversal/README.md)
164+
- [Queue](../src/test/kotlin/com/igorwojda/queue/basic)
165+
- [Combine two queues](../src/test/kotlin/com/igorwojda/queue/combine)
166+
- [Tree traversal](../src/test/kotlin/com/igorwojda/tree/classic/traversal)
167167

168168
## Stack
169169

170-
- [Stack](../src/test/kotlin/com/igorwojda/stack/basic/README.md)
171-
- [Tree traversal](../src/test/kotlin/com/igorwojda/tree/classic/traversal/README.md)
170+
- [Stack](../src/test/kotlin/com/igorwojda/stack/basic)
171+
- [Tree traversal](../src/test/kotlin/com/igorwojda/tree/classic/traversal)
172172

173173
## Heap
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175-
- [Max binary heap](../src/test/kotlin/com/igorwojda/tree/heap/maxbinaryheap/README.md)
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- [Max binary heap](../src/test/kotlin/com/igorwojda/tree/heap/maxbinaryheap)
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## Tree
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- [Binary search tree](../src/test/kotlin/com/igorwojda/tree/binarysearchtree/README.md)
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- [Tree level width](../src/test/kotlin/com/igorwojda/tree/classic/levelwidth/README.md)
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- [Tree](../src/test/kotlin/com/igorwojda/tree/classic/traversal/README.md)
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- [Binary search tree](../src/test/kotlin/com/igorwojda/tree/binarysearchtree)
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- [Tree level width](../src/test/kotlin/com/igorwojda/tree/classic/levelwidth)
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- [Tree](../src/test/kotlin/com/igorwojda/tree/classic/traversal)

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