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import java.util.NoSuchElementException;

/**

* Очередь: FIFO = First Input First Output

*/

public class Queue<T> {

Element head = null;

Element tail = null;

int size = 0;

/**

* Добавить в конец очереди

*

* @param v значение

*/

public void put(T v) {

// TODO: реализовать

Element putElement = new Element(v);

if (head == null) {

assert tail == null;

head = putElement;

tail = putElement;

return;

}

tail.next = putElement;

tail = putElement;

size++;

}

/**

* Взять из начала очереди

*

* @return значение

*/

public T get() throws NoSuchElementException {

// TODO: реализовать

if (head == null) {

assert tail == null;

throw new NoSuchElementException();

}

Element current = head;

head = head.next;

--size;

return current.value;

}

/**

* Элемент очереди

*/

class Element {

T value;

Element next = null;

public Element(T v) {

this.value = v;

}

}

}