Home Work Question related to Lect-48 added

Lecture048 Linked List Day5/Remove Duplicates From an Unsorted LL

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+Q.Remove Duplicates From an Unsorted Linked List:
+  https://www.naukri.com/code360/problems/remove-duplicates-from-unsorted-linked-list_1069331
+  Solution:-
+
+  	// Not Optimized: using map
+			#include <bits/stdc++.h> 
+			/****************************************************************
+				Following is the class structure of the Node class:
+				class Node {
+				public:
+					int data;
+					Node *next;
+					Node(int data) {
+						this->data = data;
+						this->next = NULL;
+					}
+				};
+			*****************************************************************/
+			Node *removeDuplicates(Node *head) {
+				Node *cur = head;
+				Node *prev = NULL;
+				map<int, bool> vis;
+
+				while(cur){
+					if(vis[cur -> data]){
+						Node *temp = cur;
+
+						prev -> next = cur -> next;
+						cur = cur -> next;
+
+						delete temp;
+					}else{
+						vis[cur -> data] = 1;
+						prev = cur;
+						cur =cur -> next;
+					}
+				}
+				return head;
+			}
+
+			// or TC: O(N²) & SC: O(1), Using loop
+				Node *removeDuplicates(Node *head){
+					Node *i, *j;
+					i = head;
+					while(i){
+						j = i -> next;
+						Node *prev = i;
+
+						while(j){
+							if(i -> data == j -> data){
+								prev -> next = j -> next;
+
+								delete j;
+
+								j = prev -> next;
+							}else{
+								prev = j;        
+								j= j-> next;
+							}
+						}
+						i = i-> next;
+					}
+					return head;
+				}
+
+		// Optimized: using Map
+			Node *removeDuplicates(Node *head){
+				unordered_map<int, bool> vis;
+				if(!head)
+					return head;
+
+				vis[head -> data] = 1;
+				Node *cur = head;
+
+				while(cur -> next){
+					if(vis[cur -> next -> data]){
+						cur -> next = cur -> next -> next;
+					}else{
+						vis[cur -> next -> data] = 1;
+						cur = cur -> next;
+					}
+				}
+				return head;
+			}
+

Lecture048 Linked List Day5/Split A Circular Linked List.txt

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+Split A Circular Linked List: (Coding Ninja)
+	https://www.naukri.com/code360/problems/split-a-circular-linked-list_1071003
+
+	#include <bits/stdc++.h> 
+	/********************************
+		class Node {
+			public:
+			int data;
+			Node *next;
+			Node(int data) {
+				this->data = data;
+				this->next = NULL;
+			}
+		};
+	********************************/
+	// Solution 1:
+		void splitCircularList(Node *head) {
+			if(head == NULL)
+				return ;
+
+			Node *slow, *fast;
+			slow = fast = head;
+
+			while(fast -> next != head){
+				fast = fast -> next;
+				if(fast -> next == head)
+					break;
+
+				fast = fast -> next;
+				slow = slow -> next;
+			}
+			fast -> next = slow -> next;
+			slow -> next = head;
+		}
+
+	// Solution 2:Brute Force:
+		int getLen(Node *h){
+			int l=0;
+			Node *Same = h;
+
+			while(h){
+				l++;
+				h = h-> next;
+
+				if(Same == h)
+					break;
+			}
+			return l;
+		}
+		void splitCircularList(Node *head) {
+			if(!head)
+				return ;
+			int len = getLen(head) / 2;
+			Node *first = head;
+
+			while(--len)
+				first = first -> next;
+
+			Node *second = first -> next;
+			Node *temp = second;
+
+			while(second -> next != head)
+				second = second -> next;
+
+			first -> next = head;
+			second -> next = temp;
+		}
+
+Split a Circular Linked List into two halves: (GFG)
+	https://www.geeksforgeeks.org/problems/split-a-circular-linked-list-into-two-halves/1
+	// Solution:
+	void splitList(Node *head, Node **head1_ref, Node **head2_ref) {
+		Node *slow = head;
+		Node *fast = head;
+
+		while(fast -> next != head){
+			fast = fast -> next;
+			if(fast -> next == head)
+				break;
+
+			fast = fast -> next;
+			slow = slow -> next;
+		}
+
+		fast -> next = slow -> next;
+		slow -> next = head;
+
+		*head1_ref = head;
+		*head2_ref = (fast -> next);
+	}