added 2 more problems on linked lists

Hackerrank/MergePointoftwolinkedlists.c

@@ -0,0 +1,36 @@
+#include <stdio.h>
+
+typedef struct node
+{
+    int data;
+    struct node *next;
+} SinglyLinkedListNode;
+
+int findMergeNode(SinglyLinkedListNode *head1, SinglyLinkedListNode *head2)
+{
+
+    SinglyLinkedListNode *temp1 = head1;
+    SinglyLinkedListNode *temp2 = head2;
+
+    while (temp1 != temp2)
+    {
+
+        if (temp1 == NULL)
+        {
+            temp1 = head2;
+        }
+        else
+        {
+            temp1 = temp1->next;
+        }
+
+        if (temp2 == NULL)
+        {
+            temp2 = head1;
+        }
+        else
+        {
+            temp2 = temp2->next;
+        }
+    }
+}

Hackerrank/README.md

@@ -1,57 +1,57 @@
 # These Are The Problem of Above Solutions :
-
- * ## [A Chessboard Game](https://www.hackerrank.com/challenges/a-chessboard-game-1/problem)
- * ## [Alternating Characters](https://www.hackerrank.com/challenges/alternating-characters/problem)
- * ## [Beautiful Binary String](https://www.hackerrank.com/challenges/beautiful-binary-string/problem)
- * ## [Beautiful Triplets](https://www.hackerrank.com/challenges/beautiful-triplets/problem)
- * ## [Between Two Sets](https://www.hackerrank.com/challenges/between-two-sets/problem)
- * ## [Bigger is Greater](https://www.hackerrank.com/challenges/bigger-is-greater/problem)
- * ## [Birthday Cake Candles](https://www.hackerrank.com/challenges/birthday-cake-candles/problem)
- * ## [Breaking the Records](https://www.hackerrank.com/challenges/breaking-best-and-worst-records/problem)
- * ## [Caesar Cipher](https://www.hackerrank.com/challenges/caesar-cipher-1/problem)
- * ## [Cavity Map](https://www.hackerrank.com/challenges/cavity-map/problem)
- * ## [Circular Array Rotation](https://www.hackerrank.com/challenges/circular-array-rotation/problem)
- * ## [Closest Numbers](https://www.hackerrank.com/challenges/closest-numbers/problem)
- * ## [Counting Valleys](https://www.hackerrank.com/challenges/counting-valleys/problem)
- * ## [Cut the sticks](https://www.hackerrank.com/challenges/cut-the-sticks/problem)
- * ## [Designer PDF Viewer](https://www.hackerrank.com/challenges/designer-pdf-viewer/problem)
- * ## [Encryption](https://www.hackerrank.com/challenges/encryption/problem)
- * ## [Fair Rations](https://www.hackerrank.com/challenges/fair-rations/problem)
- * ## [Find the Median](https://www.hackerrank.com/challenges/find-the-median/problem)
- * ## [Flipping bits](https://www.hackerrank.com/challenges/flipping-bits/problem)
- * ## [Game of Thrones - I](https://www.hackerrank.com/challenges/game-of-thrones/problem)
- * ## [Grid Challenge](https://www.hackerrank.com/challenges/grid-challenge/problem)
- * ## [Hacker Rank HackerRank in a String](https://prosenc.blogspot.com/2017/04/hacker-rank-hackerrank-in-string.html)
- * ## [Halloween Sale](https://www.hackerrank.com/challenges/halloween-sale/problem)
- * ## [Happy Ladybugs](https://www.hackerrank.com/challenges/happy-ladybugs/problem)
- * ## [Ice Cream Parlor](https://www.hackerrank.com/challenges/icecream-parlor/problem)
- * ## [Journey to the Moon](https://www.hackerrank.com/challenges/journey-to-the-moon/problem)
- * ## [Jumping on the Clouds](https://www.hackerrank.com/challenges/jumping-on-the-clouds/problem)
- * ## [Jumping on the Clouds: Revisited](https://www.hackerrank.com/challenges/jumping-on-the-clouds-revisited/problem)
- * ## [Number Line Jumps](https://www.hackerrank.com/challenges/kangaroo/problem)
- * ## [Lisa's Workbook](https://www.hackerrank.com/challenges/lisa-workbook/problem)
- * ## [Lonely Integer](https://www.hackerrank.com/challenges/lonely-integer/problem)
- * ## [The Love-Letter Mystery](https://www.hackerrank.com/challenges/the-love-letter-mystery/problem)
- * ## [Luck Balance](https://www.hackerrank.com/challenges/luck-balance/problem)
- * ## [Marc's Cakewalk](https://www.hackerrank.com/challenges/marcs-cakewalk/problem)
- * ## [Mark and Toys](https://www.hackerrank.com/challenges/mark-and-toys/problem)
- * ## [Maximum Perimeter Triangle](https://www.hackerrank.com/challenges/maximum-perimeter-triangle/problem)
- * ## [Minimum Distances](https://www.hackerrank.com/challenges/minimum-distances/problem)
- * ## [Modified Kaprekar Numbers](https://www.hackerrank.com/challenges/kaprekar-numbers/problem)
- * ## [Picking Numbers](https://www.hackerrank.com/challenges/picking-numbers/problem)
- * ## [The Power Sum](https://www.hackerrank.com/challenges/the-power-sum/problem)
- * ## [Roads and Libraries](https://www.hackerrank.com/challenges/torque-and-development/problem)
- * ## [Service Lane](https://www.hackerrank.com/challenges/service-lane/problem)
- * ## [Sherlock and the Valid String](https://www.hackerrank.com/challenges/sherlock-and-valid-string/problem)
- * ## [Smart Number](https://www.hackerrank.com/challenges/smart-number/problem)
- * ## [String Construction](https://www.hackerrank.com/challenges/string-construction/problem)
- * ## [Strong Password](https://www.hackerrank.com/challenges/strong-password/problem)
- * ## [Super Reduced String](https://www.hackerrank.com/challenges/reduced-string/problem)
- * ## [Taum and B'day](https://www.hackerrank.com/challenges/taum-and-bday/problem)
- * ## [Time Conversion](https://www.hackerrank.com/challenges/time-conversion/problem)
- * ## [Two Strings](https://www.hackerrank.com/challenges/two-strings/problem)
- * ## [Weighted Uniform Strings](https://www.hackerrank.com/challenges/weighted-uniform-string/problem)
- * ## [Sparse Arrays](https://www.hackerrank.com/challenges/sparse-arrays/problem)
- * ## [Deletion of a node from linked list](https://www.hackerrank.com/challenges/delete-a-node-from-a-linked-list/problem)
 
-
+- ## [A Chessboard Game](https://www.hackerrank.com/challenges/a-chessboard-game-1/problem)
+- ## [Alternating Characters](https://www.hackerrank.com/challenges/alternating-characters/problem)
+- ## [Beautiful Binary String](https://www.hackerrank.com/challenges/beautiful-binary-string/problem)
+- ## [Beautiful Triplets](https://www.hackerrank.com/challenges/beautiful-triplets/problem)
+- ## [Between Two Sets](https://www.hackerrank.com/challenges/between-two-sets/problem)
+- ## [Bigger is Greater](https://www.hackerrank.com/challenges/bigger-is-greater/problem)
+- ## [Birthday Cake Candles](https://www.hackerrank.com/challenges/birthday-cake-candles/problem)
+- ## [Breaking the Records](https://www.hackerrank.com/challenges/breaking-best-and-worst-records/problem)
+- ## [Caesar Cipher](https://www.hackerrank.com/challenges/caesar-cipher-1/problem)
+- ## [Cavity Map](https://www.hackerrank.com/challenges/cavity-map/problem)
+- ## [Circular Array Rotation](https://www.hackerrank.com/challenges/circular-array-rotation/problem)
+- ## [Closest Numbers](https://www.hackerrank.com/challenges/closest-numbers/problem)
+- ## [Counting Valleys](https://www.hackerrank.com/challenges/counting-valleys/problem)
+- ## [Cut the sticks](https://www.hackerrank.com/challenges/cut-the-sticks/problem)
+- ## [Designer PDF Viewer](https://www.hackerrank.com/challenges/designer-pdf-viewer/problem)
+- ## [Encryption](https://www.hackerrank.com/challenges/encryption/problem)
+- ## [Fair Rations](https://www.hackerrank.com/challenges/fair-rations/problem)
+- ## [Find the Median](https://www.hackerrank.com/challenges/find-the-median/problem)
+- ## [Flipping bits](https://www.hackerrank.com/challenges/flipping-bits/problem)
+- ## [Game of Thrones - I](https://www.hackerrank.com/challenges/game-of-thrones/problem)
+- ## [Grid Challenge](https://www.hackerrank.com/challenges/grid-challenge/problem)
+- ## [Hacker Rank HackerRank in a String](https://prosenc.blogspot.com/2017/04/hacker-rank-hackerrank-in-string.html)
+- ## [Halloween Sale](https://www.hackerrank.com/challenges/halloween-sale/problem)
+- ## [Happy Ladybugs](https://www.hackerrank.com/challenges/happy-ladybugs/problem)
+- ## [Ice Cream Parlor](https://www.hackerrank.com/challenges/icecream-parlor/problem)
+- ## [Journey to the Moon](https://www.hackerrank.com/challenges/journey-to-the-moon/problem)
+- ## [Jumping on the Clouds](https://www.hackerrank.com/challenges/jumping-on-the-clouds/problem)
+- ## [Jumping on the Clouds: Revisited](https://www.hackerrank.com/challenges/jumping-on-the-clouds-revisited/problem)
+- ## [Number Line Jumps](https://www.hackerrank.com/challenges/kangaroo/problem)
+- ## [Lisa's Workbook](https://www.hackerrank.com/challenges/lisa-workbook/problem)
+- ## [Lonely Integer](https://www.hackerrank.com/challenges/lonely-integer/problem)
+- ## [The Love-Letter Mystery](https://www.hackerrank.com/challenges/the-love-letter-mystery/problem)
+- ## [Luck Balance](https://www.hackerrank.com/challenges/luck-balance/problem)
+- ## [Marc's Cakewalk](https://www.hackerrank.com/challenges/marcs-cakewalk/problem)
+- ## [Mark and Toys](https://www.hackerrank.com/challenges/mark-and-toys/problem)
+- ## [Maximum Perimeter Triangle](https://www.hackerrank.com/challenges/maximum-perimeter-triangle/problem)
+- ## [Minimum Distances](https://www.hackerrank.com/challenges/minimum-distances/problem)
+- ## [Modified Kaprekar Numbers](https://www.hackerrank.com/challenges/kaprekar-numbers/problem)
+- ## [Picking Numbers](https://www.hackerrank.com/challenges/picking-numbers/problem)
+- ## [The Power Sum](https://www.hackerrank.com/challenges/the-power-sum/problem)
+- ## [Roads and Libraries](https://www.hackerrank.com/challenges/torque-and-development/problem)
+- ## [Service Lane](https://www.hackerrank.com/challenges/service-lane/problem)
+- ## [Sherlock and the Valid String](https://www.hackerrank.com/challenges/sherlock-and-valid-string/problem)
+- ## [Smart Number](https://www.hackerrank.com/challenges/smart-number/problem)
+- ## [String Construction](https://www.hackerrank.com/challenges/string-construction/problem)
+- ## [Strong Password](https://www.hackerrank.com/challenges/strong-password/problem)
+- ## [Super Reduced String](https://www.hackerrank.com/challenges/reduced-string/problem)
+- ## [Taum and B'day](https://www.hackerrank.com/challenges/taum-and-bday/problem)
+- ## [Time Conversion](https://www.hackerrank.com/challenges/time-conversion/problem)
+- ## [Two Strings](https://www.hackerrank.com/challenges/two-strings/problem)
+- ## [Weighted Uniform Strings](https://www.hackerrank.com/challenges/weighted-uniform-string/problem)
+- ## [Sparse Arrays](https://www.hackerrank.com/challenges/sparse-arrays/problem)
+- ## [Deletion of a node from linked list](https://www.hackerrank.com/challenges/delete-a-node-from-a-linked-list/problem)
+- ## [Finding merge point of two linked lists](https://www.hackerrank.com/challenges/find-the-merge-point-of-two-joined-linked-lists/problem)
+- ## [Reversing a doubly linked list](https://www.hackerrank.com/challenges/reverse-a-doubly-linked-list/problem)

Hackerrank/Reversingadoublylinkedlist.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+typedef struct node
+{
+    int data;
+    struct node *next;
+    struct node *prev;
+
+} DoublyLinkedListNode;
+
+DoublyLinkedListNode *reverse(DoublyLinkedListNode *head)
+{
+
+    DoublyLinkedListNode *returner = head;
+    // DoublyLinkedListNode *temp=head;
+
+    while (head != NULL)
+    {
+        DoublyLinkedListNode *prev = head->prev;
+        head->prev = head->next;
+        head->next = prev;
+        returner = head;
+        head = head->prev;
+    }
+
+    return returner;
+}