Merge two sorted single-linked lists

Topic

Enter two incrementally sorted lists, merge the two linked lists, and keep the nodes in the new list in ascending order.

Analysis

To merge a single linked list, you need to find the head node, control the two linked list head node, determine the head node, and then determine the head node next node, loop recursive as the previous operation to determine the location of each node, the same time consider the boundary conditions, assuming that two linked list is empty. There is no need to merge, that is, the empty list, if a list is empty, and one is not empty, then returns a list that is not empty. The detailed analysis process can look at the following examples:

"Test Code"

#include<Stdio.H>#include<Stdlib.H>#include<Stack>typedef int DATA_TYPE;TYPEDEF struct Node node_t;//Assign individual names to struct node node_ttypedef struct NODE*Node_ptr;//Give the struct node* an individual name node_ptrtypedef struct node{Data_typeData; struct Node*Node_next;//node_next is a pointer to a struct that tells the pointer to address it to a struct-type address};//List initializationnode_t*Init () {node_ptr p; P=(node_t*) malloc (sizeof (node_t)); P -Node_next= NULL;returnP;}//Insert a node behind a linked listnode_t*Insert_back (Node_ptr p, data_typeData) {Node_ptr pnew=(node_t*) malloc (sizeof (node_t)); Pnew -Node_next= NULL; Pnew -Data = Data; P -Node_next=Pnew;returnPnew;} node_t*Merge (Node_ptr List1_head, node_ptr list2_head) {if(List1_head== NULL)returnList2_head;Else if(List2_head== NULL)returnList1_head; Node_ptr Merge_head= NULL;if(List1_head -Data <List2_head -Data) {Merge_head=List1_head; Merge_head -Node_next=Merge (List1_head -Node_next,list2_head); }Else{Merge_head=List2_head; Merge_head -Node_next=Merge (List1_head, List2_head -Node_next); }returnMerge_head;}//Normal printingvoidPrint (Node_ptr p) {if(!P) {printf ("No data, you think too much");return; } node_ptrList =P while(List -Node_next!= NULL) {printf ("%d",List -Data);List = List -Node_next; } printf ("%d",List -Data); printf"\ n");}voidMain () {node_ptr pnode1,pnode2, list1,list2; Pnode1=Init (); Pnode2=Init (); List1=Pnode1; List2=Pnode2; Pnode1=Insert_back (Pnode1,1); Pnode1=Insert_back (Pnode1,3); Pnode1=Insert_back (Pnode1,5); Pnode2=Insert_back (Pnode2,2); Pnode2=Insert_back (Pnode2,4); Pnode2=Insert_back (Pnode2,6); printf"single-Link table 1 is:"); Print (List1 -Node_next); printf"Its head node element is:%d\n", List1 -Node_next -Data); printf"single-Link table 2 is:"); Print (List2 -Node_next); printf"Its head node element is:%d\n", List2 -Node_next -Data); printf"\ n"); node_t*Merge_list=Merge (List1 -Node_next, List2 -Node_next); printf"Merge single-linked list order:");    Print (merge_list); printf"head node element:%d\n", merge_list -Data); printf"\ n");}

Output

Merge two sorted single-linked lists