求链表倒数第几个节点

使用两个指针，和判断一个链表是否形成环类似

代码：

#include <iostream>
#include <list>
using namespace std;

typedef struct node {
	int data;
	struct node  *next ;
}Node,*pNode;

void creatNode( pNode &pHead ){
	bool isFirst=true;
	pNode p,q;
	int temp;
	scanf("%d",&temp);
	while(temp){
		p=(pNode)malloc(sizeof(Node));
		p->data = temp;
		p->next = NULL;
		if(isFirst){
			q=pHead=p;
			isFirst = false;
		}else{
			q->next = p;
			q = p;
		}
		scanf("%d",&temp);
	}
}

void print(pNode p){
	while(p){
		cout<<p->data << " ";
		p = p->next;
	}

}

pNode printLast(pNode pHead,unsigned int m){
	if(NULL == pHead || m==0)
		return NULL ;
	pNode pAhead = pHead;
	pNode pBehind = pHead;
	for(int i=1;i<=m;i++){
		if(pAhead->next != NULL)
			pAhead = pAhead->next;
		else
			return NULL;

	}
	while(pAhead){
		pAhead = pAhead->next;
		pBehind = pBehind->next;
	}
	return pBehind;
}

int main()
{
	pNode pHead=NULL;
	creatNode(pHead);
	print(pHead);
    cout<<endl<< printLast(pHead,2)->data;
    return 0;
}

运行结果：

求链表倒数第几个节点,布布扣,bubuko.com