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Add links to Youtube solutions into javadoc of remaining tasks
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‎README.md

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| Быстрая сортировка (Quick sort) | [Youtube](https://youtu.be/lp1UsN1-_p4) | [Code](src/main/java/by/andd3dfx/sorting/QuickSort.java) |
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| Генерация перестановок (leetcode) | [Youtube](https://youtu.be/PyRnm2mFZbk) | [Code](src/main/java/by/andd3dfx/common/Permutations.java) |
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| Интерполяционный поиск в упорядоченном массиве | [Youtube](https://youtu.be/kRTntkCB_a4) | [Code](src/main/java/by/andd3dfx/search/InterpolationSearch.java) |
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| Птицеферма (с элементами ООП) | [Youtube](https://youtu.be/tQAJRQrc2Aw) | [Code](src/main/java/by/andd3dfx/common/birdsfarm) |
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| Птицеферма (с элементами ООП) | [Youtube](https://youtu.be/tQAJRQrc2Aw) | [Code](src/main/java/by/andd3dfx/common/birdsfarm/README.MD) |
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| Определение более длинного конца цепи | [Youtube](https://youtu.be/KAqZwNY7yUc) | [Code](src/main/java/by/andd3dfx/common/ChainLink.java) |
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| Прыжки по разрушающимся платформам | [Youtube](https://youtu.be/okH8weUwc8k) | [Code](src/main/java/by/andd3dfx/common/Platformer.java) |
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| Сортировка квадратов упорядоченного массива (3 способа) (leetcode) | [Youtube](https://youtu.be/49DpyzZN4NM) | [Code](src/main/java/by/andd3dfx/common/SortedSquares.java) |
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| Распространение чумы между городами (2 решения) | [Youtube](https://youtu.be/Ei1uCCD_Iqg) | [Code](src/main/java/by/andd3dfx/common/InfectionDistribution.java) |
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| Реверсирование порядка цифр в числе (2 решения) | [Youtube](https://youtu.be/w3C4L7GxD7M) | [Code](src/main/java/by/andd3dfx/numeric/ReverseDigitsOrder.java) |
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| Поиск среди пар чисел значения, встречающегося однажды: магия XOR (2 решения) (leetcode) | [Youtube](https://youtu.be/dNB8tOvx5Gk) | [Code](src/main/java/by/andd3dfx/numeric/FindNumberWhichAppearsOnce.java) |
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| Удаление дубликатов в сортированном связном списке (2 задачи) (leetcode) | [Youtube](https://youtu.be/ryE_Q_AtAg8) | [Code](src/main/java/by/andd3dfx/collections/RemoveDuplicatesFromSortedLinkedList.java) [Code2](src/main/java/by/andd3dfx/collections/RemoveDuplicatesFromSortedLinkedList_II.java) |
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| Удаление дубликатов в сортированном связном списке ч.I,II (leetcode) | [Youtube](https://youtu.be/ryE_Q_AtAg8) | [Code](src/main/java/by/andd3dfx/collections/RemoveDuplicatesFromSortedLinkedList.java) [Code2](src/main/java/by/andd3dfx/collections/RemoveDuplicatesFromSortedLinkedList_II.java) |
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| Генерация валидных комбинаций скобок (leetcode) | [Youtube](https://youtu.be/UMBenJ4PZKU) | [Code](src/main/java/by/andd3dfx/common/GenerateParentheses.java) |
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| Валидация записи числа регулярным выражением (leetcode) | [Youtube](https://youtu.be/Xy0iJ7w_UO8) | [Code](src/main/java/by/andd3dfx/numeric/ValidNumber.java) |
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| Проверка, является ли число степенью заданного числа (2 решения) (leetcode) | [Youtube](https://youtu.be/E1Gue5EcvK4) | [Code](src/main/java/by/andd3dfx/numeric/PowerOfThree.java) |
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| Прокрутка односвязного списка (leetcode) | [Youtube](https://youtu.be/6tyflwO6PwY) | [Code](src/main/java/by/andd3dfx/collections/RotateLinkedList.java) |
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| Поиск подстроки в строке за O(N+M): алгоритм Бойера-Мура (2 решения) (leetcode) | [Youtube](https://youtu.be/77fzfJIs_YY) | [Code](src/main/java/by/andd3dfx/string/boyermoore/FindSubstringBoyerMoore.java) [Code2](src/main/java/by/andd3dfx/string/boyermoore/FindSubstringBoyerMooreEnhanced.java) |
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| Задачи из интервью на написание SQL-запросов | [Youtube](https://youtu.be/GjDF_LdwYHU) | [Code](sql) |
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| Задачи из интервью на написание SQL-запросов | [Youtube](https://youtu.be/GjDF_LdwYHU) | [Code](sql/README.md) |
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| Поиск слова в матрице букв (leetcode) | [Youtube](https://youtu.be/FsKU04anMtE) | [Code](src/main/java/by/andd3dfx/search/wordsearch/WordSearch.java) |
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| Сжатие строки (Яндекс) | [Youtube](https://youtu.be/s3sGF7C6cV8) | [Code](src/main/java/by/andd3dfx/string/MakeStringCompact.java) |
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| Самодельный Stack | [Youtube](https://youtu.be/sZ-DrSHhrWc) | [Code](src/main/java/by/andd3dfx/collections/custom/CustomStack.java) |
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| Сортировка Шелла (Shell sort) | [Youtube](https://youtu.be/1wyVIGI7EX8) | [Code](src/main/java/by/andd3dfx/sorting/ShellSort.java) |
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| Размен минимальным количеством монет (2 решения) | [Youtube](https://youtu.be/K1xPbYPslRU) | [Code](src/main/java/by/andd3dfx/dynamic/ChangeWithMinNumberOfCoins.java) |
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| Замена всех '?' в строке, избегая повторяющихся последовательных символов (leetcode) | [Youtube](https://youtu.be/OgMnvWfhqrk) | [Code](src/main/java/by/andd3dfx/string/ReplaceQCharToAvoidConsecutiveRepeatingChars.java) |
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| Заказ фурнитуры: добавить пропущенный код | [Youtube](https://youtu.be/TNgR6JaxwFg) | [Code](src/main/java/by/andd3dfx/common/furniture) |
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| Заказ фурнитуры: добавить пропущенный код | [Youtube](https://youtu.be/TNgR6JaxwFg) | [Code](src/main/java/by/andd3dfx/common/furniture/README.md) |
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| Поиск в сортированном массиве количества элементов меньших заданного (3 решения) | [Youtube](https://youtu.be/a2dvtrdi1YI) | [Code](src/main/java/by/andd3dfx/search/FindAmountOfElementsLessThan.java) |
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| Факториал (4 решения) | [Youtube](https://youtu.be/HZrTppQjXVs) | [Code](src/main/java/by/andd3dfx/numeric/factorial) |
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| Вычисление среднего, медианы, моды, квартилей | [Youtube](https://youtu.be/nqalmvHE_-A) | [Code](src/main/java/by/andd3dfx/numeric/MeanMedianMode.java) |

‎sql/README.md

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- [14. Поиск сотрудника с второй по величине зарплатой](14.sql)
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- [15. Задача о пользователях и их телефонах](15.sql)
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- [16. Задача про стадионы и матчи](16.sql)
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See [video solutions](https://youtu.be/GjDF_LdwYHU) of these tasks on YouTube

‎src/main/java/by/andd3dfx/annotation/CustomClassAnnotation.java

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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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/**
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* @see <a href="https://youtu.be/ERKYwftYjtk">Video solution</a>
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*/
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@Retention(RetentionPolicy.RUNTIME)
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@Target(ElementType.TYPE)
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public @interface CustomClassAnnotation {

‎src/main/java/by/andd3dfx/annotation/CustomMethodAnnotation.java

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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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/**
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* @see <a href="https://youtu.be/ERKYwftYjtk">Video solution</a>
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*/
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@Retention(RetentionPolicy.RUNTIME)
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@Target(ElementType.METHOD)
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public @interface CustomMethodAnnotation {

‎src/main/java/by/andd3dfx/cache/LFUCache.java

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* Note that the number of times an item is used is the number of calls to the get and put functions
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* for that item since it was inserted. This number is set to zero when the item is removed.
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* </pre>
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*
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* @see <a href="https://youtu.be/4hhu0cSVUCA">Video solution</a>
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*/
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@Slf4j
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@RequiredArgsConstructor

‎src/main/java/by/andd3dfx/cache/LRUCache.java

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*
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* The cache is initialized with a positive capacity.
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* <pre/>
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*
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* @see <a href="https://youtu.be/ZrF5s4_jNZk">Video solution</a>
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*/
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@RequiredArgsConstructor
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public class LRUCache {

‎src/main/java/by/andd3dfx/collections/DeleteNthElementFromLinkedListEnd.java

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import lombok.AllArgsConstructor;
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import lombok.Data;
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/**
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* @see <a href="https://youtu.be/1cn_3eCvnq0">Video solution</a>
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*/
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public class DeleteNthElementFromLinkedListEnd {
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@Data

‎src/main/java/by/andd3dfx/collections/LoopInLinkedList.java

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/**
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* Find loop in the linked list
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*
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* @see <a href="https://youtu.be/5IcvvtfLGvM">Video solution</a>
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*/
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public class LoopInLinkedList {
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‎src/main/java/by/andd3dfx/collections/RemoveDuplicatesFromSortedArray.java

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* respectively.
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* It does not matter what you leave beyond the returned k (hence they are underscores).
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* </pre>
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*
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* @see <a href="https://youtu.be/gbReaBoFHkc">Video solution</a>
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*/
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public class RemoveDuplicatesFromSortedArray {
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‎src/main/java/by/andd3dfx/collections/RemoveDuplicatesFromSortedArray_II.java

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* respectively.
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* It does not matter what you leave beyond the returned k (hence they are underscores).
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* </pre>
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*
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* @see <a href="https://youtu.be/gbReaBoFHkc">Video solution</a>
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*/
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public class RemoveDuplicatesFromSortedArray_II {
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‎src/main/java/by/andd3dfx/collections/RemoveDuplicatesFromSortedLinkedList.java

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*
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* The list is guaranteed to be sorted in ascending order.
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* </pre>
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*
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* @see <a href="https://youtu.be/ryE_Q_AtAg8">Video solution</a>
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*/
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public class RemoveDuplicatesFromSortedLinkedList {
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‎src/main/java/by/andd3dfx/collections/RemoveDuplicatesFromSortedLinkedList_II.java

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*
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* The list is guaranteed to be sorted in ascending order.
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* </pre>
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*
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* @see <a href="https://youtu.be/ryE_Q_AtAg8">Video solution</a>
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*/
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public class RemoveDuplicatesFromSortedLinkedList_II {
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‎src/main/java/by/andd3dfx/collections/ReverseAnySequence.java

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/**
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* Examples how to reverse any list using different methods
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*
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* @see <a href="https://youtu.be/Ql6JGqcSiNk">Video solution</a>
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*/
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public class ReverseAnySequence {
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‎src/main/java/by/andd3dfx/collections/ReverseLinkedList.java

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import java.util.ArrayDeque;
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import java.util.Deque;
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/**
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* @see <a href="https://youtu.be/iEKdRgKNurg">Video solution</a>
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*/
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public class ReverseLinkedList {
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@Data

‎src/main/java/by/andd3dfx/collections/RotateLinkedList.java

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* Input: head = [0,1,2], k = 4
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* Output: [2,0,1]
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* </pre>
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*
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* @see <a href="https://youtu.be/6tyflwO6PwY">Video solution</a>
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*/
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public class RotateLinkedList {
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‎src/main/java/by/andd3dfx/collections/StackWithMinSupportO1.java

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*
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* push() and getMin() should have O(1) complexity.
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* </pre>
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*
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* @see <a href="https://youtu.be/-Y-_0R8tfyk">Video solution</a>
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*/
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public class StackWithMinSupportO1 {
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‎src/main/java/by/andd3dfx/collections/custom/CustomArrayList.java

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import java.util.Arrays;
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/**
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* @see <a href="https://youtu.be/u7Vyh567ljs">Video solution</a>
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*/
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public class CustomArrayList<T> implements Iterable<T> {
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private static final int DEFAULT_INITIAL_SIZE = 10;

‎src/main/java/by/andd3dfx/collections/custom/CustomHashMap.java

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import java.util.Iterator;
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/**
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* @param <K> key
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* @param <V> value
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*
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* @see <a href="https://youtu.be/-GECqwRV8Uw">Video solution</a>
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*/
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public class CustomHashMap<K, V> {
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private static final int BUCKETS_COUNT = 16;

‎src/main/java/by/andd3dfx/collections/custom/CustomHashSet.java

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import java.util.Collection;
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/**
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* @see <a href="https://youtu.be/aTbKxApYNYk">Video solution</a>
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*/
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public class CustomHashSet<T> implements Iterable<T> {
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private CustomHashMap<T, Object> map = new CustomHashMap<>();

‎src/main/java/by/andd3dfx/collections/custom/CustomLinkedHashSet.java

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/**
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* @see <a href="https://youtu.be/GlV87RWHhOQ">Video solution</a>
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*/
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public class CustomLinkedHashSet<T> extends CustomHashSet<T> {
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private CustomLinkedList<T> linkedList = new CustomLinkedList<>();

‎src/main/java/by/andd3dfx/collections/custom/CustomLinkedList.java

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import java.util.Iterator;
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/**
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* @see <a href="https://youtu.be/vHjvNHBQP3o">Video solution</a>
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*/
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public class CustomLinkedList<T> implements Iterable<T> {
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‎src/main/java/by/andd3dfx/collections/custom/CustomStack.java

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import java.util.NoSuchElementException;
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/**
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* @see <a href="https://youtu.be/sZ-DrSHhrWc">Video solution</a>
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*/
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public class CustomStack<T> {
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private final CustomLinkedList<T> linkedList = new CustomLinkedList<>();

‎src/main/java/by/andd3dfx/common/ATM.java

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* Надо реализовать метод withdraw() для выдачи заданной суммы amount имеющимися в банкомате купюрами.
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* Метод withdraw() - мутирующий, т.е. меняет состояние банкомата после вызова (кол-во купюр может уменьшиться).
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* </pre>
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*
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* @see <a href="https://youtu.be/LDKZtDevRRI">Video solution</a>
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*/
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public class ATM {
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‎src/main/java/by/andd3dfx/common/ArrayRanges.java

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* [1,4,3,2] => "1-4"
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* [1,4] => "1,4"
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* </pre>
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*
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* @see <a href="https://youtu.be/ql6TROfbnYk">Video solution</a>
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*/
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public class ArrayRanges {
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‎src/main/java/by/andd3dfx/common/ArraysUnion.java

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/**
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* Даны 2 упорядоченных массива с уникальными элементами,
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* найти и вывести их упорядоченное объединение без дубликатов.
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*
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* @see <a href="https://youtu.be/uABGnnTD0Kw">Video solution</a>
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*/
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public class ArraysUnion {
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‎src/main/java/by/andd3dfx/common/BracketsExpressionValidator.java

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* ([{}]) -> true
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* ([)] -> false
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*
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* @see <a href="https://youtu.be/4kimh-Gsuxs">Video solution</a>
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*/
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public class BracketsExpressionValidator {
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‎src/main/java/by/andd3dfx/common/Candies.java

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* - Eat 2, Get 1, Remaining 1
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* - Eat 1
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* </pre>
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*
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* @see <a href="https://youtu.be/UNz2nM2qQ3E">Video solution</a>
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*/
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public class Candies {
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‎src/main/java/by/andd3dfx/common/ChainLink.java

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* middle.append(right);
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* System.out.println(left.longerSide());
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* </pre>
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*
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* @see <a href="https://youtu.be/KAqZwNY7yUc">Video solution</a>
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*/
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public class ChainLink {
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‎src/main/java/by/andd3dfx/common/ClimbingStairs.java

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* Constraints:
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* 1 <= n <= 45
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*
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* @see <a href="https://youtu.be/bjE3KQM4ko4">Video solution</a>
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*/
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public class ClimbingStairs {
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‎src/main/java/by/andd3dfx/common/CountStreamers.java

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* Вам дан массив (неупорядоченный) из пар (t_in, t_out) – длина массива от 0 до 10^6.
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* Требуется вывести число – максимальное количество пользователей,
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* которые одновременно смотрели стрим.
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* </pre>
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*
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* </pre>
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*/
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public class CountStreamers {
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‎src/main/java/by/andd3dfx/common/DoorNBox.java

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* Имеется коробка со сторонами: A × B × C.
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* Определить, пройдёт ли она в дверь с размерами M × K.
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* </pre>
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*
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* @see <a href="https://youtu.be/ix81AbCNiBE">Video solution</a>
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*/
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public class DoorNBox {
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‎src/main/java/by/andd3dfx/common/DoorsNKeys.java

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*
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* Можете ли вы открыть все двери?
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* </pre>
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*
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* @see <a href="https://youtu.be/ix81AbCNiBE">Video solution</a>
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*/
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public class DoorsNKeys {
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‎src/main/java/by/andd3dfx/common/FileSystemPath.java

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import java.util.Deque;
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/**
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* Write a function that provides change directory (cd) function for an abstract file system.
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* <pre>
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* Write a function that provides change directory (cd) function for an abstract file system.
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* Notes:
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* Root path is '/'.
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* Path separator is '/'.
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*
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* should display '/a/b/c/x'.
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* </pre>
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*
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* @see <a href="https://youtu.be/HLoLoIaL--I">Video solution</a>
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*/
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public class FileSystemPath {
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‎src/main/java/by/andd3dfx/common/GenerateParentheses.java

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* Constraints:
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* 1 <= n <= 8
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* <pre/>
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*
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* @see <a href="https://youtu.be/UMBenJ4PZKU">Video solution</a>
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*/
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public class GenerateParentheses {
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