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		<title>常见算法总结 &#8211; 链表篇-思洋互动</title>
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咱们能够选用快慢指针的思维，运用步长为1的慢指针和步长为2的快指针，当快指针抵达链表结尾时，此时慢指针指向的即为中点方位。
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                                    <h1 class="mg-bt35">常见算法总结 &#8211; 链表篇</h1>
                                    <span>时间：2023-05-16</span>
                                </div>
                                <div class="edit2 mg-bt60 wow slideUp">
                                                                        <p>1.怎么找到链表的中心元素？<br />
咱们能够选用快慢指针的思维，运用步长为1的慢指针和步长为2的快指针，当快指针抵达链表结尾时，此时慢指针指向的即为中点方位。<br />
publicstaticLinkNodefindMiddleByPointer(LinkNodenode){<br />
LinkNodeslow=node;<br />
LinkNodefast=node;//检测快指针是否能够安全移动while(fast.next!=null&amp;&amp;fast.next.next!=null){<br />
slow=slow.next;<br />
fast=fast.next.next;<br />
}returnslow;<br />
}<br />
咱们还能够选用递归的方式，当递归到最结尾的时分，咱们现已能知道链表的长度，此时当递归回去的时分，判别当时递归层级等于链表长度一半的时分，即为链表的要点。<br />
publicstaticvoidfindMiddleByRecursion(LinkNodenode,intrecursionIndex){if(node.next!=null){<br />
findMiddleByRecursion(node.next,recursionIndex+1);<br />
}else{<br />
middleIndex=recursionIndex%2==0?recursionIndex/2:recursionIndex/2+1;<br />
}if(middleIndex==recursionIndex){<br />
System.out.println(node.value);<br />
}return;<br />
}<br />
2.检测链表是否有环。<br />
检测链表是否有环是非常常见的算法考察。常见的就是运用快慢指针，假如快慢指针有重合的时分，说明链表是有环的。<br />
publicstaticbooleanisExistCircle(LinkNodenode){<br />
LinkNodeslow=node;<br />
LinkNodefast=node;while(fast.next!=null&amp;&amp;fast.next.next!=null){<br />
slow=slow.next;<br />
fast=fast.next.next;if(slow==fast){<br />
returntrue;<br />
}<br />
}<br />
returnfalse;<br />
}<br />
3.怎么列表回转（递归）<br />
咱们能够在递归回溯的时分，反向更改节点的指针。<br />
publicstaticvoidreverseLinkListByRecursion(LinkNodecur,LinkNodenext){if(next==null){<br />
return;<br />
}<br />
reverseLinkListByRecursion(next,next.next);next.next=cur;<br />
cur.next=null;<br />
return;<br />
}<img class="aligncenter  wp-image-4824" src="https://zzzjtd.com/wp-content/uploads/2019/07/209.jpg" alt="java" width="459" height="232" /><br />
4.怎么回转链表（非递归）<br />
回转链表的非递归方式，咱们能够选用三个指针，别离指向当时节点，下个节点，下下个节点，调整好下个节点的next指向后，持续使用下下个节点进行往后操作。<br />
publicstaticvoidreverseLinkListByPointer(LinkNodenode){<br />
LinkNodecur=node;<br />
LinkNodenext=node.next;<br />
LinkNodenextNext=null;<br />
cur.next=null;while(next!=null){<br />
nextNext=next.next;next.next=cur;<br />
cur=next;next=nextNext;<br />
}<br />
}<br />
5.删去经过排序的链表中重复的节点。<br />
通过在遍历中，判别当时的数字是否与之前的重复数字相同，假如相同的话，直接越过，直到找到与之前重复数字不同时，将原先的指针越过重复的节点，指向当时非重复数字节点。<br />
publicstaticvoidremoveDuplicateNode(LinkNodenode){if(node==null){<br />
return;<br />
}<br />
LinkNodecur=node;<br />
LinkNodenext=node.next;intdupicateVal=node.value;while(next!=null){if(next.value==dupicateVal){next=next.next;<br />
continue;<br />
}<br />
dupicateVal=next.value;<br />
cur.next=next;<br />
cur=next;next=next.next;<br />
}<br />
}<br />
6.怎么核算两个链表的代表数字之和。<br />
将链表代表的数字进行相加即可，注意首位代表的是个位。3-&gt;1-&gt;5代表513，5-&gt;9-&gt;2代表295，最终核算结果为8-&gt;0-&gt;8，808。<br />
publicstaticLinkNodesumTwoLinkList(LinkNodenum1,LinkNodenum2){//假如其间一个链表为空的，直接当做0处理，回来另外一个链表if(num1==null){returnnum2;<br />
}if(num2==null){returnnum1;<br />
}<br />
LinkNodesum=newLinkNode();//保存头结点，假如核算完成后直接回来头结点LinkNodehead=sum;//是否进位booleanisOver=false;//当两个节点，其间一个存在时，即可进行累加while(num1!=null||num2!=null){//默认初始化为0intnum1Val=0;intnum2Val=0;if(num1!=null){<br />
num1Val=num1.value;<br />
}if(num2!=null){<br />
num2Val=num2.value;<br />
}//假如进位的话多加1intsingleSum=num1Val+num2Val+(isOver==true?1:0);if(singleSum&gt;=10){<br />
isOver=true;<br />
singleSum=singleSum%10;<br />
}else{<br />
isOver=false;<br />
}<br />
sum.value=singleSum;//移动指针num1=num1!=null?num1.next:null;<br />
num2=num2!=null?num2.next:null;//没有数字相加，直接结束if(num1==null&amp;&amp;num2==null){break;<br />
}else{//还有数字相加的话提前生成下个数字sum.next=newLinkNode();<br />
sum=sum.next;<br />
}<br />
}returnhead;<br />
}<br />
7.链表-奇数位升序偶数位降序-让链表变成升序<br />
先将链表拆分红奇数的链表，和偶数的链表，然后翻转偶数的链表，在兼并两个链表。<br />
publicclassSortAscDescLinkList{publicstaticLinkNodeoddLinkList=null;publicstaticLinkNodeevenLinkList=null;publicstaticvoidmain(String[]args){//初始化测试链表LinkNodex1=newLinkNode(1);<br />
LinkNodex2=newLinkNode(10);<br />
LinkNodex3=newLinkNode(2);<br />
LinkNodex4=newLinkNode(9);<br />
LinkNodex5=newLinkNode(3);<br />
LinkNodex6=newLinkNode(8);<br />
LinkNodex7=newLinkNode(4);<br />
LinkNodex8=newLinkNode(7);<br />
LinkNodex9=newLinkNode(5);<br />
LinkNodex10=newLinkNode(6);<br />
x1.setNext(x2).setNext(x3).setNext(x4).setNext(x5).setNext(x6).setNext(x7).setNext(x8).setNext(x9).setNext(x10);//先按奇数偶数位拆分链表splitList(x1);//再回转链表evenLinkList=reverseLinkList(evenLinkList);//再兼并链表mergeList(oddLinkList,evenLinkList);<br />
oddLinkList.printList();<br />
}/**<br />
*拆分两个链表<br />
*@paramnode<br />
*/publicstaticvoidsplitList(LinkNodenode){<br />
oddLinkList=node;<br />
evenLinkList=node.next;<br />
LinkNodeoddCur=node;<br />
LinkNodeevenCur=node.next;while(oddCur!=null||evenCur!=null){if(oddCur.next!=null&amp;&amp;oddCur.next.next!=null){<br />
oddCur.next=oddCur.next.next;<br />
oddCur=oddCur.next;<br />
}else{<br />
oddCur.next=null;<br />
oddCur=null;<br />
}if(evenCur.next!=null&amp;&amp;evenCur.next.next!=null){<br />
evenCur.next=evenCur.next.next;<br />
evenCur=evenCur.next;<br />
}else{<br />
evenCur.next=null;<br />
evenCur=null;<br />
}<br />
}<br />
}/**<br />
*回转链表<br />
*@paramnode<br />
*@return*/publicstaticLinkNodereverseLinkList(LinkNodenode){<br />
LinkNodecur=node;<br />
LinkNodenext=node.next;<br />
LinkNodenextNext=null;<br />
cur.next=null;while(next!=null){<br />
nextNext=next.next;<br />
next.next=cur;<br />
cur=next;<br />
next=nextNext;<br />
}returncur;<br />
}/**<br />
*兼并两个链表<br />
*@paramoddLinkList<br />
*@paramevenLinkList<br />
*/publicstaticvoidmergeList(LinkNodeoddLinkList,LinkNodeevenLinkList){<br />
LinkNodeoddTail=oddLinkList;while(oddTail.next!=null){<br />
oddTail=oddTail.next;<br />
}<br />
oddTail.next=evenLinkList;<br />
}<br />
}<br />
8.一个单向链表，删去倒数第N个数据。<br />
预备两个指针，初始指向头结点，1号指针先走n步，然后2号指针开始走，当1号指针走到尾节点时，2号指针即为倒数第N个数据。<br />
publicstaticLinkNodefindLastKNumber(LinkNodenode,intk){<br />
LinkNodefast=node;<br />
LinkNodeslow=node;for(inti=0;i&lt;k;i++){//假如fast为空的话，说明k超出规模if(fast==null){thrownewRuntimeException(&#8220;超出链表规模！&#8221;);<br />
}<br />
fast=fast.next;<br />
}while(fast!=null){<br />
fast=fast.next;<br />
slow=slow.next;<br />
}returnslow;<br />
}<br />
笔者个人总结，如有过错之处望不吝指出。</p>


		
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