Diagram operation for single-linked list inversion

Source: Internet
Author: User

There is a linear table \$ (a_1,a_2, \cdots, A_n) \$, which takes the lead node of the single-linked list \$l\$ storage, and designs an algorithm to reverse it in place. The so-called "in-place" refers to the auxiliary space of \$o (1) \$.

Answer: Scan the original single linked list with \$p\$ pointer, first \$l\$ the \$next\$ domain of the head node to \$null\$ and become an empty list, then, the \$*p\$ node is inserted into the \$l\$ by the head interpolation method. The algorithm is as follows:

`1 voidReverse (linklist *&L) {2Linklist *p=l->next,*Q;3l->next=NULL;4      while(p!=NULL)5     {6Q=p->Next;7p->next=l->next;//Insert the *p node in front of the new linked list8l->next=p;9p=Q;Ten     } One  A}`

The diagram of the above algorithm is as follows:

The complete code is as follows:

`//LinkBase.h#include <stdio.h>#include<malloc.h>typedefintElemtype;typedefstructlnode{elemtype data; structLnode *Next;} linklist;voidInitlist (linklist *&L) {L= (linklist *)malloc(sizeof(linklist)); L->next=NULL;}voidDestroylist (linklist *&L) {linklist*p=l, *q=p->Next;  while(q!=NULL) {         Free(P); P=Q; Q=p->Next; }     Free(P); }intListlength (linklist *m) {linklist*p=m; intI=0;  while(p->next!=NULL) {i++; P=p->Next; }    returni;}voidDisplist (linklist *L) {linklist*p=l->Next;  while(p!=NULL) {printf ("%d",p->data); P=p->Next; } printf ("\ n");}intGetelem (linklist *l,intI,elemtype &e) {    intj=0; Linklist*p=m;  while(J<i && p!=NULL) {J++; P=p->Next; }    if(p==NULL) {        return 0; }    Else{e=p->data; return 1; }}intLocateelem (linklist *L,elemtype e) {linklist*p=l->Next; intn=1;  while(P!=null && p->data!=e) {p=p->Next; N++; }    if(p==NULL)return 0; Else        returnN;}intListinsert (linklist *&l,intI,elemtype e) {    intj=0; Linklist*p=l,*s;  while(j<i-1&& p!=NULL) {J++; P=p->Next; }    if(p==NULL)return 0; Else{s= (linklist *)malloc(sizeof(linklist)); S->data=e; S->next=p->Next; P->next=s; return 1; }}intListdelete (linklist *&l,intI,elemtype &e) {    intj=0; Linklist*p=l,*Q;  while(j<i-1&& p!=NULL) {J++; P=p->Next; }    if(p==NULL)return 0; Else{Q=p->Next; if(Q==null)return 0; E=q->data; P->next=q->Next;  Free(q); return 1; }}//main function. cpp#include"LinkBase.h"#include<stdio.h>voidReverse (linklist *&m) {linklist*p=l->next,*Q; L->next=NULL;  while(p!=NULL) {Q=p->Next; P->next=l->next;//Insert the *p node in front of the new linked listl->next=Q; P=Q; }}voidMain () {linklist*ls = (linklist *)malloc(sizeof(linklist)); Ls->next=NULL; intI=0;  for(i=1;i<Ten; i++) {Listinsert (ls,i,i*i-1); } printf ("original linear table: \ n");    Displist (Ls); //Listinsert (ls,3,15);Reverse (Ls); printf ("linear table after reversal: \ n");    Displist (Ls);  Free(Ls);}`

The effect is as follows:

Diagram operation for single-linked list inversion

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