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Commit7de19ee

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Merge pull requestneetcode-gh#2479 from Anukriti167/patch-4
Update 0148-sort-list.java
2 parents0c2adfb +846e6c3 commit7de19ee

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‎java/0148-sort-list.java

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/**
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* Definition for singly-linked list.
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* public class ListNode {
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* int val;
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* ListNode next;
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* ListNode() {}
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* ListNode(int val) { this.val = val; }
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* ListNode(int val, ListNode next) { this.val = val; this.next = next; }
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* }
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*/
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classSolution {
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// Merge Sort Implementation
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publicListNodegetMid(ListNodehead){
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ListNodeslow=head,fast=head.next;
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while(fast !=null &&fast.next !=null){
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fast =fast.next.next;
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slow =slow.next;
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}
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returnslow;
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}
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publicListNodemerge(ListNodeleft,ListNoderight){
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ListNodedummy =newListNode();
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ListNodetail =dummy;
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while(left !=null &&right !=null){
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if(left.val <right.val){
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tail.next =left;
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left =left.next;
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}else{
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tail.next =right;
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right =right.next;
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}
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tail =tail.next;
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}
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if(left !=null){
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tail.next =left;
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}
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if(right !=null){
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tail.next =right;
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}
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returndummy.next;
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}
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publicListNodesortList(ListNodehead) {
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if(head ==null ||head.next ==null){
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returnhead;
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}
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// Split the list in 2 halfs
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ListNodeleft =head;
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ListNoderight =getMid(head);
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ListNodetmp =right.next;
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right.next =null;
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right =tmp;
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left =sortList(left);
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right =sortList(right);
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returnmerge(left,right);
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}
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}
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// Using a Heap to sort the list
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classSolution {
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publicListNodesortList(ListNodehead) {
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if(head ==null ||head.next ==null){

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