// return the head of the new linked list
public static LinkedListNode partitionAround(LinkedListNode ll, int x) {
// start from a list with only one node
// we are actually creating a new linked list
LinkedListNode head = ll;
LinkedListNode tail = ll;
while (ll != null) {
// because the current node ll will be moved, we have to
// save the next node for the loop to continue
LinkedListNode next = ll.next;
if (ll.data < x) {
// prepend the node
ll.next = head;
// update the head
head = ll;
} else {
// append the node
tail.next = ll;
// update the tail
tail = ll;
}
ll = next;
}
tail.next = null;
return head;
}
public LinkedListNode partition(LinkedListNode head, int x) {
LinkedListNode ll = null, l = null, r = null, rr = null;
while (head != null) {
LinkedListNode next = head.next;
head.next = null;
if (head.data < x) {
if (ll == null) {
ll = head;
l = ll;
} else {
l.next = head;
l = head;
}
} else {
if (r == null) {
r = head;
rr = r;
} else {
rr.next = head;
rr = head;
}
}
head = next;
}
if (ll == null) return l;
l.next = r;
return ll;
}
public static void main(String[] args) {
LinkedListNode node1 = new LinkedListNode(10);
LinkedListNode node2 = new LinkedListNode(15);
LinkedListNode node3 = new LinkedListNode(12);
node1.next = node2;
node2.next = node3;
System.out.println(getNthFromLast(1, node1));
}
public static void main(String[] args) {
LinkedListNode node1 = new LinkedListNode(10);
LinkedListNode node2 = new LinkedListNode(15);
LinkedListNode node3 = new LinkedListNode(12);
node1.next = node2;
node2.next = node3;
printList(node1);
deleteFastNode(node1);
printList(node1);
}
public void insert(int[] array, int startIndex) {
for (int i = startIndex; i < array.length; i++) {
LinkedListNode node = new LinkedListNode(array[i]);
tail.next = node;
tail = node;
}
}
public static void main(String[] args) {
LinkedListNode h1 = new LinkedListNode(1);
LinkedListNode h2 = new LinkedListNode(5);
LinkedListNode h3 = new LinkedListNode(3);
LinkedListNode h4 = new LinkedListNode(9);
LinkedListNode h5 = new LinkedListNode(2);
h1.next = h2;
h2.next = h3;
h3.next = h4;
h4.next = h5;
LinkedListNode res = new CC204().partition1(h1, 4);
while (res != null) {
System.out.println(res.data);
res = res.next;
}
}
/**
* Adds a node to the beginning of the list.
*
* @param node the node to add to the beginning of the list.
*/
public LinkedListNode addFirst(LinkedListNode node) {
node.next = head.next;
node.previous = head;
node.previous.next = node;
node.next.previous = node;
return node;
}
public static LinkedListNode buildList(int[] A) {
LinkedListNode head = new LinkedListNode(A[0]);
for (i = 1; i < A.length; i++) {
head.next = new LinkedListNode(A[i]);
head = head.next;
}
return head;
}
@Override
public String toString() {
LinkedListNode node = head;
String res = new String("[");
while (node != null) {
res = res + node.value();
if (node.next() != null) {
res = res + ", ";
}
node = node.next();
}
res = res + "]";
return res;
}
public static boolean deleteNode(LinkedListNode n) {
if (n == null || n.next == null) return false;
n.data = n.next.data;
n.next = n.next.next;
return true;
}
Boolean deleteMiddleGivenNode(LinkedListNode n) {
if (n == null || n.next == null) {
return false;
}
LinkedListNode nextNode = n.next;
n.data = nextNode.data;
n.next = nextNode.next;
return true;
}
public void insert(LinkedListNode node) {
if (head == null) {
head = node;
tail = node;
} else {
tail.next = node;
tail = node;
}
}
static void deleteFastNode(LinkedListNode node) {
if (node == null) return;
LinkedListNode node1 = node.next;
if (node1 != null) {
node.next = node1.next;
node.value = node1.value;
} else {
node = null;
}
}
public void offer(int val) {
LinkedListNode node = new LinkedListNode(val);
if (size == 0) {
head = node;
tail = node;
} else {
tail.next = node;
tail = tail.next;
}
size++;
}
/** Erases all elements in the list and re-initializes it. */
public void clear() {
// Remove all references in the list.
LinkedListNode node = getLast();
while (node != null) {
node.remove();
node = getLast();
}
// Re-initialize.
head.next = head.previous = head;
}
public LinkedListNode partition1(LinkedListNode node, int x) {
LinkedListNode left = null, right = null;
while (node != null) {
LinkedListNode next = node.next;
if (node.data < x) {
node.next = left;
left = node;
} else {
node.next = right;
right = node;
}
node = next;
}
if (left == null) return right;
LinkedListNode start = left;
while (left.next != null) {
left = left.next;
}
left.next = right;
return start;
}
public void removeDuplicatesUsingMaps(LinkedListNode n) {
HashSet<Integer> set = new HashSet<Integer>();
LinkedListNode previous = null;
while (n.next != null) {
if (set.contains(n.data)) {
previous.next = n.next;
} else {
set.add(n.data);
previous = n;
}
n = n.next;
}
}
/* Insert key and value into hash table. */
public void put(K key, V value) {
LinkedListNode<K, V> node = getNodeForKey(key);
if (node != null) {
node.value = value; // just update the value.
return;
}
node = new LinkedListNode<K, V>(key, value);
int index = getIndexForKey(key);
if (arr.get(index) != null) {
node.next = arr.get(index);
node.next.prev = node;
}
arr.set(index, node);
}
public void removeDuplicatesUsingTwoPointers(LinkedListNode n) {
LinkedListNode p1 = n;
while (p1.next != null) {
LinkedListNode p2 = p1;
while (p2.next != null) {
if (p2.next.data == p1.data) {
p2.next = p2.next.next;
} else {
p2 = p2.next;
}
}
p1 = p1.next;
}
}
public static void main(String[] args) {
LinkedListNode h1 = new LinkedListNode(1);
LinkedListNode h2 = new LinkedListNode(5);
LinkedListNode h3 = new LinkedListNode(3);
LinkedListNode h4 = new LinkedListNode(9);
LinkedListNode h5 = new LinkedListNode(2);
LinkedListNode h6 = new LinkedListNode(8);
h1.next = h2;
h2.next = h3;
h3.next = h4;
h4.next = h5;
h5.next = h6;
h6.next = h3;
CC205 c = new CC205();
LinkedListNode res = new CC206().findBegin(h1);
// while(res!=null){
// System.out.println(res.data);
// res=res.next;
// }
System.out.println(res.data);
}
/** Removes this node from the linked list that it is a part of. */
public void remove() {
previous.next = next;
next.previous = previous;
}
/** Creates a new linked list. */
public LinkedList() {
head.next = head.previous = head;
}
/** Remove the value that is on the top of the stack */
public void pop() {
head = head.next();
}
