added circular-singly-1

linked-list-circular-singly-1-insertion/linked-list-circular-singly-1-insertion.go

@@ -0,0 +1,175 @@
+// ====================================================
+// Data-Structures-with-Go Copyright(C) 2017 Furkan Türkal
+// This program comes with ABSOLUTELY NO WARRANTY; This is free software,
+// and you are welcome to redistribute it under certain conditions; See
+// file LICENSE, which is part of this source code package, for details.
+// ====================================================
+
+package main
+
+import "fmt"
+
+type Node struct {
+	data int
+	next *Node
+}
+
+//Returns an initialized list
+func (n *Node) Init() *Node {
+	n.data = -1
+	return n
+}
+
+//Returns an new list
+func New() *Node {
+	return new(Node).Init()
+}
+
+//Returns the first node in list
+func (n *Node) Next() *Node {
+	return n.next
+}
+  
+//Returns the last node in list if exist, otherwise returns current
+func (n *Node) Back() *Node {
+	current := n.next
+	for current != nil && current.next != nil {
+		current = current.next
+	}
+	return current
+}
+
+//Function to insert node in an empty List
+func AddToEmpty(last *Node, data int) *Node {
+	if(last != nil){
+		return last
+	}
+
+	//Creating a node
+	temp := New()
+
+	//Assigning the data
+	temp.data = data
+	last = temp
+
+	//Creating the link
+	last.next = last
+
+	return last
+}
+
+//Function to insert node in the beginning of the List
+func AddBegin(last *Node, data int) *Node {
+	if(last == nil){
+		return AddToEmpty(last, data)
+	}
+
+	//Creating a node
+	temp := New()
+
+	//Assigning the data
+	temp.data = data
+
+	//List was empty. We link single node to itself
+	temp.next = last.next
+	last.next = temp
+
+	return last
+}
+
+//Function to insert node in the end of the List
+func AddEnd(last *Node, data int) *Node {
+	if(last == nil){
+		return AddToEmpty(last, data)
+	}
+
+	//Creating a node
+	temp := New()
+
+	//Assigning the data
+	temp.data = data
+
+	//List was empty. We link single node to itself
+	temp.next = last.next
+	last.next = temp
+	last = temp
+
+	return last
+}
+
+//Function to insert node in the end of the List
+func AddAfter(last *Node, data int, item int) *Node {
+	if(last == nil){
+		return nil
+	}
+
+	//Creating a node
+	temp := New()
+	p := New()
+
+	p = last.next
+
+	for(p != last.next){
+		if(p.data == item){
+			//Assigning the data
+			temp.data = data
+			//Adjusting the links
+			temp.next = p.next
+
+			//Adding newly allocated node after p
+			p.next = temp
+
+			//Checking for the last node
+			if(p == last){
+				last = temp
+			}
+
+			return last
+		}
+		p = p.next
+	}
+
+	fmt.Printf("\n%d not present in the list.\n", item)
+
+	return last
+}
+
+func Traverse(last *Node){
+	p := New()
+
+	//If list is empty, return
+	if(last == nil){
+		fmt.Println("List is empty")
+		return
+	}
+
+	//Pointing to first Node of the list
+	p = last.next
+
+	//Traversing the list
+	for p != nil {
+		fmt.Println(p.data)
+		p = p.next
+	}
+}
+
+//This function prints contents of linked list starting from the given node
+func printList(n *Node){
+	for n != nil {
+		fmt.Println(n.data)
+		n = n.next
+	}
+}
+
+func main() {
+	last := New()
+
+	last = AddEnd(last, 12)
+	last = AddToEmpty(last, 6)
+	last = AddBegin(last, 4)
+	last = AddBegin(last, 2)
+	last = AddEnd(last, 8)
+	last = AddAfter(last, 10, 8)
+
+	Traverse(last)
+}