public int insertAtN(int pos, Node newNode) {
if (newNode == null || pos <= 0) {
System.out.println("Invalid node or position");
return -1;
}
if (pos == 1) {
newNode.next = head;
head = newNode;
return 1;
}
Node temp = head;
int counter = 1;
while (temp.next != null && counter < pos - 1) {
temp = temp.next;
counter++;
}
if (counter < pos - 1) {
System.out.println("insert position is greater than list length");
return -1;
}
newNode.next = temp.next;
temp.next = newNode;
return pos;
}
/**
* Will add a new item to the start of the deque. Will throw an error if an empty item is passed
* through. If this is the first item that has been added to the deque, then this will also set
* the last item in the deque to be the first.
*
* @param item The item to add to the start of the deque
*/
public void addFirst(Item item) {
if (item == null) {
throw new NullPointerException("Woah, you can't add nothing");
}
Node previousFirst = first;
first = new Node();
first.item = item;
first.previous = null;
if (previousFirst == null) {
// This is the first time something has been added to the deque
first.next = null;
} else {
first.next = previousFirst;
previousFirst.previous = first;
}
// Is this the only node in the deque?
if (last == null) {
last = first;
}
N++;
}
public static void main(String args[]) {
head = new Node(3);
Node n1 = new Node(5);
Node n2 = new Node(11);
Node n3 = new Node(2);
Node n4 = new Node(7);
Node n5 = new Node(9);
Node n6 = new Node(33);
Node n7 = new Node(1);
Node n8 = new Node(8);
Node n9 = new Node(156);
Node n10 = new Node(10);
head.next = n1;
n1.next = n2;
n2.next = n3;
n3.next = n4;
n4.next = n5;
n5.next = n6;
n6.next = n7;
n7.next = n8;
n8.next = n9;
n9.next = n10;
int k = 3;
Node p = ReverseAllKNodes(head, k);
print(p);
// KthFromEnd(head, k);
System.out.println("");
}
// no concurrent read/write is assumed
public V put(double key, V value) {
if (value == null) throw new NullPointerException();
// not incrementing b's refcnt, so need not release it.
Node b = skipListMap.findGrandPredecessor(key);
if (b == null) b = head;
Node n = b.next;
if (n == null) {
n = Node.alloc();
n.put(key, value, this);
n.next = null;
b.next = n;
return null;
}
Node f = n.next;
if (f == null) { // put (key,value) into node n
Object val = n.put(key, value, this);
return (V) val;
} else {
assert f.len() > 0 && f.first() >= key;
if (f.first() == key) {
Object val = f.put(key, value, this);
return (V) val;
} else {
Object val = n.put(key, value, this);
return (V) val;
}
}
}
public void alternateSplit(Node head) {
if (null == head || null == head.next) return;
Node current = head.next.next;
Node head1 = head;
Node head2 = head.next;
head1.next = null;
head2.next = null;
boolean first = true;
while (current != null) {
if (first) {
Node temp = current.next;
current.next = null;
head1 = Push.pushNode(head1, current);
first = false;
current = temp;
} else {
Node temp = current.next;
current.next = null;
head2 = Push.pushNode(head2, current);
first = true;
current = temp;
}
}
head1 = ReverseListIterative.reverse(head1);
head2 = ReverseListIterative.reverse(head2);
System.out.println("List1: ");
PrintLinkedList.print(head1);
System.out.println();
System.out.println("List2: ");
PrintLinkedList.print(head2);
}
/**
* Swap nodes of the given indices
*
* @param x
* @param y
*/
public void swapNodes(int x, int y) {
Node<T> cursor = head;
Node<T> curX = null;
Node<T> prevX = null;
Node<T> curY = null;
Node<T> prevY = null;
int position = 0;
if (x == y) return;
if (cursor != null && x == position) {
curX = head;
}
position++;
while (cursor != null && cursor.next != null) {
if (x == position) {
prevX = cursor;
curX = cursor.next;
}
if (y == position) {
prevY = cursor;
curY = cursor.next;
}
position++;
cursor = cursor.next;
}
Node<T> temp = null;
if (prevX != null) prevX.next = curY;
else head = curY;
prevY.next = curX;
temp = curY.next;
curY.next = curX.next;
curX.next = temp;
}
/**
* Merge Sort Part II - Merge the left and right part while sorting them in order
*
* @param leftHalfList
* @param rightHalfList
* @return
*/
private Node<T> merge(SinglyLL<T> leftHalfList, SinglyLL<T> rightHalfList) {
SinglyLL<T> sortedList = new SinglyLL<>();
Node<T> sortedListCursor = null;
Node<T> leftCursor = leftHalfList.head;
Node<T> rightCursor = rightHalfList.head;
if (leftHalfList.head != null
&& rightHalfList.head != null
&& leftHalfList.head.data.compareTo(rightHalfList.head.data) < 0) {
sortedList.head = leftCursor;
leftCursor = leftCursor.next;
} else {
sortedList.head = rightCursor;
rightCursor = rightCursor.next;
}
sortedListCursor = sortedList.head;
while (leftCursor != null && rightCursor != null) {
if (leftCursor.data.compareTo(rightCursor.data) <= 0) {
sortedListCursor.next = leftCursor;
leftCursor = leftCursor.next;
} else if (leftCursor.data.compareTo(rightCursor.data) > 0) {
sortedListCursor.next = rightCursor;
rightCursor = rightCursor.next;
}
sortedListCursor = sortedListCursor.next;
}
if (rightCursor == null) sortedListCursor.next = leftCursor;
if (leftCursor == null) sortedListCursor.next = rightCursor;
return sortedList.head;
}
public int get(int key) {
if (!cache.containsKey(key)) {
return -1;
}
Node node = cache.get(key);
if (node != head) {
Node prev = node.prev;
Node next = node.next;
node.prev = null;
node.next = head;
head.prev = node;
head = node;
prev.next = next;
if (next == null) {
least = prev;
} else {
next.prev = prev;
}
}
return node.value;
}
public void set(int key, int value) {
if (least == null) {
this.least = new Node(key, value);
this.head = this.least;
cache.put(key, this.least);
} else {
if (cache.containsKey(key)) {
Node node = cache.get(key);
node.value = value;
cache.put(key, node);
get(key);
} else {
Node node = new Node(key, value);
node.prev = null;
node.next = head;
head.prev = node;
head = node;
if (cache.size() == size) {
Node prev = least.prev;
prev.next = null;
least.prev = null;
least = prev;
cache.remove(least.key);
}
cache.put(key, node);
}
}
}
// Insert a node at a specific position in a linked list
Node InsertSpecific(Node head, int data, int position) {
// Will Need to Return Head Node
Node trackedHeadNode = head;
Node nodeToInsert = new Node();
nodeToInsert.data = data;
// Empty List - Returned newly created node or null
if (head == null) {
return nodeToInsert;
}
// Inserting a Node ahead of the List
if (position == 0) {
nodeToInsert.next = head;
return nodeToInsert;
}
// Traverse the Singly Linked List to 1 Position Prior
// Stop traversing if you reached the end of the List
int currPosition = 0;
while (currPosition < position - 1 && head.next != null) {
head = head.next;
currPosition++;
}
// Inserting a Node in-between a List or at the end of of a List
Node nodeAtPosition = head.next;
head.next = nodeToInsert;
head = head.next;
head.next = nodeAtPosition;
return trackedHeadNode;
}
// Delete a node
Node Delete(Node head, int position) {
// Complete this method
Node trackedHeadNode = head;
int currPosition = 0;
if (position == 0 && head.next == null) {
return null;
}
if (position == 0) {
head = head.next;
return head;
}
while (currPosition < position - 1 && head.next != null) {
head = head.next;
currPosition++;
}
Node tempNode = head.next;
head.next = null;
if (tempNode.next == null) {
return trackedHeadNode;
}
head.next = tempNode.next;
return trackedHeadNode;
}
public Item dequeue() // delete and return a random item
{
if (isEmpty()) {
throw new java.util.NoSuchElementException("RandomizedQueue is empty");
}
int index = StdRandom.uniform(0, size);
Node node = findNode(index);
Item item = node.item;
Node prevnode = node.prev;
Node nextnode = node.next;
if (prevnode != null) {
prevnode.next = nextnode;
} else {
first = nextnode;
}
if (nextnode != null) {
nextnode.prev = prevnode;
} else {
last = prevnode;
}
node.item = null;
node.next = null;
node.prev = null;
size--;
return item;
}
void add(int num) {
Node newNode = new Node();
newNode.contents = num;
if (first == null) {
first = newNode;
return;
}
assert first != null;
if (first.contents >= num) {
first.previous = newNode;
newNode.next = first;
first = newNode;
return;
}
assert first.contents < num;
Node tmp = first;
while (tmp.contents < num && tmp.next != null) tmp = tmp.next;
assert tmp != null;
if (tmp.contents < num && tmp.next == null) {
tmp.next = newNode;
newNode.previous = tmp;
} else {
assert tmp.contents >= num;
assert tmp.previous.contents < num;
newNode.previous = tmp.previous;
newNode.previous.next = newNode;
newNode.next = tmp;
newNode.next.previous = newNode;
}
}
/**
* Remove first occurrence of an object with the same value as obj
*
* @param object with equal value as the one to remove from the list
* @return true if an object is removed, false otherwise
*/
public boolean remove(E obj) {
if (tail == null) return false;
Node<E> list = tail.next;
// delete tail if only node
if (size == 1 && (tail.compare(obj))) {
tail = null;
size--;
return true;
}
// delete head node
if (list.compare(obj)) {
tail.next = list.next;
size--;
return true;
}
// delete middle nodes
while (list.next != tail) {
if (list.next.compare(obj)) {
// remove node from list
list.next = list.next.next;
size--;
return true;
}
list = list.next;
}
// delete tail node
if (tail.compare(obj)) {
list.next = tail.next;
tail = list;
size--;
return true;
}
return false;
}
// 插入节点
public DoubleLink insert(int ind, int x) throws Exception {
// 初始化没有节点
if (ind1 == 0 && ind == 0) {
addhead(x);
} // 节点>=1；插入位置=0
else if (ind1 >= 1 && ind == 0) {
addhead(x);
} // 节点>=2;插入位置位置不在头尾
else if (ind1 >= 2 && ind >= 1 && ind <= ind1 - 1) {
Node nn = new Node(x);
Node temp = head;
for (int i = 1; i <= ind - 1; i++) {
temp = temp.next;
}
temp.next.prior = nn;
nn.next = temp.next;
nn.prior = temp;
temp.next = nn;
ind1++;
} // 节点>=1;插入位置在尾部
else if (ind1 == ind && ind1 >= 1) {
Node nn = new Node(x);
tail.next = nn;
nn.prior = tail;
nn.next = null;
tail = nn;
ind1++;
} // 插入位置和节点不匹配
else {
throw new Exception("链表长度和插入位置不匹配.");
}
return this;
}
public Node(int nodeType, Node left, Node right) {
type = nodeType;
first = left;
last = right;
left.next = right;
right.next = null;
}
public void insert(Node newNode, int index) {
if (index > size || index < 0) {
throw new VectorIndexOutOfBoundsException();
}
Node current = null;
try {
current = getNode(index);
} catch (VectorIndexOutOfBoundsException e) {
current = head;
}
if (head != null) {
newNode.next = current;
newNode.prev = current.prev;
current.prev.next = newNode;
current.prev = newNode;
} else {
newNode.next = newNode;
newNode.prev = newNode;
}
if (index == 0) {
head = newNode;
}
++size;
}
public void removeChild(Node child) {
Node prev = getChildBefore(child);
if (prev == null) first = first.next;
else prev.next = child.next;
if (child == last) last = prev;
child.next = null;
}
/**
* Swap nodes containing the data provided.
*
* @param x
* @param y
*/
public void swapNodes(T x, T y) {
Node<T> cursor = head;
Node<T> curX = null;
Node<T> prevX = null;
Node<T> curY = null;
Node<T> prevY = null;
if (cursor != null && cursor.data.equals(x)) {
curX = head;
}
while (cursor != null && cursor.next != null) {
if (cursor.next.data.equals(x)) {
prevX = cursor;
curX = cursor.next;
}
if (cursor.next.data.equals(y)) {
prevY = cursor;
curY = cursor.next;
}
cursor = cursor.next;
}
Node<T> temp = null;
if (prevX != null) prevX.next = curY;
else head = curY;
prevY.next = curX;
temp = curY.next;
curY.next = curX.next;
curX.next = temp;
}
public void replaceChildAfter(Node prevChild, Node newChild) {
Node child = prevChild.next;
newChild.next = child.next;
prevChild.next = newChild;
if (child == last) last = newChild;
child.next = null;
}
/**
* Add an element.
*
* @param item element to add
* @param msg
* @return true if element was not there already
*/
@Override
public boolean add(Integer item, String msg) {
int key = item.hashCode();
while (true) {
Node pred = this.head;
Node curr = pred.next;
while (curr.key <= key) {
pred = curr;
curr = curr.next;
}
pred.lock();
curr.lock();
try {
if (validate(pred, curr)) {
if (curr.key == key) {
System.out.println(msg + "Adding " + item + " : cannot add same item twice.");
return false;
} else {
Node entry = new Node(item);
entry.next = curr;
pred.next = entry;
System.out.println(msg + "Adding : " + item);
return true;
}
}
} finally {
pred.unlock();
curr.unlock();
}
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Node head1 = null;
Node last1 = null;
Node head2 = null;
Node last2 = null;
Scanner in = new Scanner(System.in);
int num1 = in.nextInt();
for (int i = num1; i > 0; i--) {
if (head1 == null) {
head1 = new Node(in.nextInt(), in.nextInt());
} else {
head1.next = new Node(in.nextInt(), in.nextInt());
head1 = head1.next;
}
}
int num2 = in.nextInt();
for (int i = num2; i > 0; i--) {
if (head2 == null) {
head2 = new Node(in.nextInt(), in.nextInt());
last2 = head2;
} else {
last2.next = new Node(in.nextInt(), in.nextInt());
last2 = last2.next;
}
}
in.close();
display(head1);
display(head2);
display(PolyAdd(head1, head2));
}
/**
* Add an element.
*
* @param item element to add
* @param msg
* @return true if element was not there already
*/
@Override
public boolean add(Integer item, String msg) {
int key = item.hashCode();
head.lock();
Node pred = head;
try {
Node curr = pred.next;
curr.lock();
try {
while (curr.key < key) {
pred.unlock();
pred = curr;
curr = curr.next;
curr.lock();
}
if (curr.key == key) {
System.out.println(msg + "Adding " + item + " : cannot add same item twice.");
return false;
}
Node newNode = new Node(item);
newNode.next = curr;
pred.next = newNode;
System.out.println(msg + "Adding : " + item);
return true;
} finally {
curr.unlock();
}
} finally {
pred.unlock();
}
}
private static Node partition(Node head, int val) {
Node less = null;
Node p1 = less;
Node great = null;
Node p2 = great;
while (head != null) {
Node temp = head.next;
head.next = null;
if (head.getData() < val) {
if (less == null) {
less = head;
p1 = less;
} else {
p1.next = head;
p1 = p1.next;
}
} else {
if (great == null) {
great = head;
p2 = great;
} else {
p2.next = head;
p2 = p2.next;
}
}
head = temp;
}
p1.next = great;
return less;
}
public static Node reverseList(Node Head) {
Node node = Head;
Node reverse = null;
Node returnReverse = null;
while (node != null) {
Node prev = node;
while (node.next != null) {
prev = node;
node = node.next;
}
if (reverse == null) {
reverse = node;
returnReverse = reverse;
} else {
reverse.next = node;
reverse = reverse.next;
}
prev.next = null;
node = Head;
if (prev == node) {
// 노드 삽입
reverse.next = node;
node = null;
}
}
return returnReverse;
}
public boolean insert(Object item) {
int key = item.hashCode();
head.lock();
Node pred = head;
try {
Node curr = pred.next;
curr.lock();
try {
while (curr.key < key) {
pred.unlock();
pred = curr;
curr = curr.next;
curr.lock();
}
if (curr.key == key) {
return false;
}
Node newNode = new Node(item);
newNode.next = curr;
pred.next = newNode;
return true;
} finally {
curr.unlock();
}
} finally {
pred.unlock();
}
}
public static Node ordersort(Node head, Node waitforsort) {
Node p = head;
Node newhead = head;
Node temp = waitforsort;
while (p.expo < temp.expo) {
if (p.next == null) {
p.next = temp;
return newhead;
}
if (p.next.expo > temp.expo) {
temp.next = p.next;
p.next = temp;
return newhead;
}
p = p.next;
}
if (p.expo == temp.expo) {
p.coeff = temp.coeff + p.coeff;
return newhead;
}
if (p.expo > temp.expo) {
temp.next = p;
newhead = temp;
return newhead;
}
return newhead;
}
// Задание 2.2.3
public void combineLists(List<Item> list2) {
Node l1 = this.head;
Node l2 = list2.head;
this.push(l2.data); // добавить эл-т из второго списка в начало первого
l2 = l2.next;
int position = 1; // позиция в первом списке
while (l2 != null && l1 != null) {
if (position % 2 != 0) { // если нечётная позиция
Node newNode = new Node(); // вставляемый узел
newNode.data = l2.data;
// вставка в первый список после текущего
newNode.next = l1.next;
l1.next = newNode;
l1 = l1.next;
l2 = l2.next;
position++;
} else { // если позиция чётная
l1 = l1.next;
position++;
}
}
if (l2 != null && l1 == null) {
while (l2 != null) {
this.addLast(l2.data);
l2 = l2.next;
}
}
}
// T = LITERAL | '${' V '}'
private Node T() throws ScanException {
Token t = getCurentToken();
switch (t.type) {
case LITERAL:
advanceTokenPointer();
return new Node(Node.Type.LITERAL, t.payload);
case CURLY_LEFT:
advanceTokenPointer();
Node inner = E();
Token right = getCurentToken();
expectCurlyRight(right);
advanceTokenPointer();
Node curlyLeft = new Node(Node.Type.LITERAL, CoreConstants.LEFT_ACCOLADE);
curlyLeft.next = inner;
Node curlyRightNode = new Node(Node.Type.LITERAL, CoreConstants.RIGHT_ACCOLADE);
if (inner == null) curlyLeft.next = curlyRightNode;
else appendNode(inner, curlyRightNode);
return curlyLeft;
case START:
advanceTokenPointer();
Node v = V();
Token w = getCurentToken();
expectCurlyRight(w);
advanceTokenPointer();
return v;
default:
return null;
}
}
public Node reverseList() {
if (head == null || head.next == null) return head;
if (head.next.next == null) {
head.next.next = head;
head = head.next;
head.next.next = null;
}
Node n1 = head;
Node n2 = head.next;
Node n3 = head.next.next;
n1.next = null;
while (n2.next != null) {
n2.next = n1;
n1 = n2;
n2 = n3;
n3 = n3.next;
}
n2.next = n1;
head = n2;
return head;
}