PHP implementation merge Two sorted list of methods explained

This article mainly introduces the implementation of PHP to merge two sorted list of methods, involving PHP for the chain list traversal, judgment, sorting and other related operations skills, the need for friends can refer to the next

In this paper, we describe the method of merging two sorted lists with PHP implementation. Share to everyone for your reference, as follows:

Problem

Input two monotonically increasing list, output two list of linked lists, of course, we need to synthesize the linked list to meet the monotone non-reduction rules.

Solution Ideas

A simple merge sort. Since two numbers are incremented, each of the smaller parts of the two series can be taken over.

Implementation code

<?php/*class listnode{var $val; var $next = NULL, function __construct ($x) {  $this->val = $x;}} */function Merge ($pHead 1, $pHead 2) {if ($pHead 1 = = null)  return $pHead 2, if ($pHead 2 = = null)  return $pHead 1; $reHe AD = new ListNode (); if ($pHead 1->val < $pHead 2->val) {  $reHead = $pHead 1;  $pHead 1 = $pHead 1->next; }else{  $reHead = $pHead 2;  $pHead 2 = $pHead 2->next; } $p = $reHead; while ($pHead 1&& $pHead 2) {  if ($pHead 1->val <= $pHead 2->val) {   $p->next = $pHead 1;   $pHead 1 = $pHead 1->next;   $p = $p->next;  }  else{   $p->next = $pHead 2;   $pHead 2 = $pHead 2->next;   $p = $p->next;  } if ($pHead 1 = null) {  $p->next = $pHead 1;} if ($pHead 2! = null)  $p->next = $pHead 2; return $reHead;}

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