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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. struct listNode{
  5. 	int data;
  6. 	struct listNode* next;
  7. } typedef listNode;
  8.  
  9. /* Function to print nodes in a given linked list */
  10. void printList(listNode *node){
  11.   while(node != NULL){
  12.   	printf("%d ", node->data);
  13.    	node = node->next;
  14.   }
  15.   printf("\n");
  16. }
  17.  
  18. void push(listNode **head, int data){
  19. 	listNode *temp = (listNode *)malloc(sizeof(listNode));
  20. 	temp->data = data;
  21. 	temp->next = *head;
  22. 	*head = temp;
  23. }
  24.  
  25. /**
  26.  * Definition for singly-linked list.
  27.  * struct ListNode {
  28.  *     int val;
  29.  *     struct ListNode *next;
  30.  * };
  31.  */
  32. struct listNode* mergeTwoLists(struct listNode* a, struct listNode* b) {
  33.     struct listNode* result = NULL;  
  34.    /* Base cases */  
  35.    if (a == NULL)  
  36.      return(b);  
  37.    else if (b == NULL)  
  38.      return(a);  
  39.    /* Pick either a or b, and recur */  
  40.    if (a->data <= b->data) {  
  41.      result = a;  
  42.      result->next = mergeTwoLists(a->next, b);  
  43.    }else {  
  44.      result = b;  
  45.      result->next = mergeTwoLists(a, b->next);  
  46.    }  
  47.    return(result); 
  48. }
  49.  
  50. /* Driver program to test above functions*/
  51. int main(){
  52.   /* Start with the empty list */
  53.   listNode *a = NULL;
  54.   listNode *b = NULL;
  55.  
  56.   /* Let us create a unsorted linked lists to test the functions
  57.   Created lists shall be a: 2->3->20->5->10->15 */
  58.   push(&a, 15);
  59.   push(&a, 10);
  60.   push(&a, 5); 
  61.  
  62.   push(&b, 20);
  63.   push(&b, 3);
  64.   push(&b, 2); 
  65.   push(&b, 1); 
  66.  
  67.   printList(a);
  68.   printList(b);           
  69.   /* Sort the above created Linked List */
  70.   listNode *result = mergeTwoLists(a, b);
  71.   printf("Merged Linked List is: ");
  72.   printList(result);           
  73.  
  74.   return 0;
  75. }
Success #stdin #stdout 0s 10320KB
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Standard input is empty
stdout
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5 10 15 
1 2 3 20 
Merged Linked List is: 1 2 3 5 10 15 20
https://ideone.com/V6zDKA
language:
C (gcc 8.3)
created:
7 years ago
visibility:
secret

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