Backend DevelopmentPHP TutorialPHP implements data structure linear table (sequential and chained)_PHP tutorial
Linked list operations
1. InitList(L): Initialize the linked list
2. DestroyList(L): Delete the connection
3. ClearList(L): Clear the linked list
4. ListEmpty(L): Determine whether it is empty
5. ListLength(L): List length
6. getElem(L,i): Take out the element
7. LocateElem(L,e): Determine whether e is in the linked list
8. PriorElem(L,i): precursor
9. NextElem(L,i): Successor
10. ListInsert(L,i,e): Insert element
11. ListDelete(L,i,): Delete element
Sequential linked list operations
class ArrayList{
private $list;
private $size;
//Constructor
public function __construct(){
$this->list=array();
$this->size=0;
}
public function initList(){
$this->list=array();
$this->size=0;
}
//Delete linked list
public function destroyList(){
if(isset($this->list)){
unset($this->list);
$this->size=0;
}
}
//Clear the linked list
public function clearList(){
if(isset($this->list)){
unset($this->list);
}$this->list=array();
$this->size=0;
}
//Judge whether the linked list is empty
public function emptyList(){
if(isset($this->list)){
if($this->size=0)
return TRUE;
else
return FALSE;
}
}
//Length of linked list
public function lenghtList(){
if(isset($this->list)){
return $this->size;
}
}
//Get element
public function getElem($i){
if($i$this->size){
echo "overflow
";
exit();
}
if(isset($this->list)&&is_array($this->list)){
return $this->list[$i-1];
}
}
//Whether it is in the linked list
public function locateElem($e){
if(isset($this->list)&&is_array($this->list)){
for($i=0;$isize;$i++){
if($this->list[$i]==$e){
return $i+1;
}
}
return 0;
}
}
//Forerunner
public function priorElem($i){
if($i$this->size){
echo "overflow";
exit();
}
if($i==1){
echo "No precursor";
exit();
}
if(isset($this->list)&&is_array($this->list)){
return $this->list[$i-2];
}
}
//后继
public function nextElem($i){
if($i$this->size){
echo "溢出";
exit();
}
if($i==$this->size){
echo "没有后继";
exit();
}
if(isset($this->list)&&is_array($this->list)){
return $this->list[$i];
}
}
//插入元素
public function insertList($i,$e){
if($i$this->size+1){
echo "插入元素位置有误";
exit();
}
if(isset($this->list)&&is_array($this->list)){
if($this->size==0){
$this->list[$this->size]=$e;
$this->size++;
}else{
$this->size++;
for($j=$this->size-1;$j>=$i;$j--){
$this->list[$j]=$this->list[$j-1];
}
$this->list[$i-1]=$e;
}
}
}
//删除元素
public function deleteLlist($i){
if($i$this->size){
echo "删除元素位置有误";
exit();
}
if(isset($this->list)&&is_array($this->list)){
if($i==$this->size){
unset($this->list[$this->size-1]);
}else{
for($j=$i;$jsize;$j++){
$this->list[$j-1]=$this->list[$j];
}
unset($this->list[$this->size-1]);
}
$this->size--;
}
}
//遍历
public function printList(){
if(isset($this->list)&&is_array($this->list)){
foreach ($this->list as $value){
echo $value." ";
}
echo "
";
}
}
}
?>
//链式线性表
class LinkList {
private $head;
private $size;
private $list;
public function__construct(){
$this->head="";
$this->size=0;
$this->list=array();
}
public functioninitList(){
$this->head="";
$this->size=0;
$this->list=array();
}
//删除链表
public functiondestoryList(){
if(isset($this->list)&&isset($this->head)){
unset($this->list);
unset($this->head);
}
}
//清空链表
public functionclearList(){
if(isset($this->list)){
unset($this->list);
}
$this->list=array();
$this->size=0;
$this->head="";
}
//判断链表是否为空
public functionemptyList(){
if(isset($this->list)){
if($this->size==0)
returnTRUE;
else
returnFALSE;
}
}
//链表长度
public functionlenghtList(){
if(isset($this->list)){
return$this->size;
}
}
//取元素
public function getElem($i){
if($i$this->size){
echo "溢出
";
exit();
}
if(isset($this->list)&&is_array($this->list)){
$j=1;
//头指针
$tmp=$this->head;
while($i>$j){
if($this->list[$tmp]['next']!=null){
$tmp=$this->list[$tmp]['next'];
$j++;
}
}
return $this->list[$tmp]['data'];
}
}
//是否在链表中
public functionlocateElem($e){
if(isset($this->list)&&is_array($this->list)){
$tmp=$this->head;
while($this->list[$tmp]['data']!=$e){
if($this->list[$tmp]['next']!=null){
$tmp=$this->list[$tmp]['next'];
}else{
returnFALSE;
}
}
return TRUE;
}
}
//前驱
public functionpriorElem($i){
if($i=$this->size){
echo "溢出";
exit();
}
if($i==1){
echo "没有前驱";
exit();
}
$tmp=$this->head;
$j=1;
while($i>$j+1){
if($this->list[$tmp]['next']!=null){
$j++;
$tmp=$this->list[$tmp]['next'];
}
}
return$this->list[$tmp]['data'];
}
//后继
public functionnextElem($i){
if($i$this->size){
echo "溢出";
exit();
}
if($i==$this->size){
echo "没有后继";
exit();
}
$j=1;
$tmp=$this->head;
while($i>=$j){
if($this->list[$tmp]['next']!=null){
$j++;
$tmp=$this->list[$tmp]['next'];
}
}
return$this->list[$tmp]['data'];
}
//插入元素:后插法
public functioninsertList($i,$e){
if(isset($this->list)&&is_array($this->list)){
//空表
if($this->size==0){
$this->head=$this->uuid();
$this->list[$this->head]['data']=$e;
$this->list[$this->head]['next']=NULL;
$this->size++;
}else{
if($i$this->size){
echo"插入元素位置有误";
exit();
}
$j=1;
$tmp=$this->head;
while($i>$j){
if($this->list[$tmp]['next']!=null){
$j++;
$tmp=$this->list[$tmp]['next'];
}
}
$find=$tmp;
$id=$this->uuid();
if($this->list[$find]['next']==null){
//尾部
$this->list[$find]['next']=$id;
$this->list[$id]['data']=$e;
$this->list[$id]['next']=null;
$this->size++;
}else{
//中间
$this->list[$id]['next']=$this->list[$find]['next'];
$this->list[$find]['next']=$id;
$this->list[$id]['data']=$e;
$this->size++;
}
}
}
}
//删除元素
public functiondeleteLlist($i){
if($i$this->size){
echo "删除元素位置有误";
exit();
}
if(isset($this->list)&&is_array($this->list)){
if($i==1){
//删除头元素
$this->head=$this->list[$this->head]['next'];
}else{
$tmp=$this->head;
$j=1;
while($i>$j+1){
if($this->list[$tmp]['next']!=null){
$j++;
$tmp=$this->list[$tmp]['next'];
}
}
//找到删除元素的前驱
$find=$tmp;
//删除的元素
if($this->list[$find]['next']!=null){
//不是最后一个元素
$delete=$this->list[$find]['next'];
$this->list[$find]['next']=$this->list[$delete]['next'];
}else{
$this->list[$tmp]['next']=null;
}
}
}
}
public functiontraverstList(){
$tmp=$this->head;
while($this->list[$tmp]['next']!=NULL){
$this->printList($this->list[$tmp]['data'],TRUE);
$tmp=$this->list[$tmp]['next'];
}
$this->printList($this->list[$tmp]['data'],FALSE);
}
public functionprintList($str,$flag){
if($flag){
echo$str."->";
}else {
echo$str."
";
}
}
//uuid 唯一码
public function uuid($prefix = '') {
$chars =md5(uniqid(mt_rand(), true));
$uuid = substr($chars,0,8) . '-';
$uuid .=substr($chars,8,4) . '-';
$uuid .=substr($chars,12,4) . '-';
$uuid .=substr($chars,16,4) . '-';
$uuid .= substr($chars,20,12);
return $prefix. $uuid;
}
}
?>
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