时间:2021-07-01 10:21:17 帮助过:4人阅读
本文实例讲述了PHP实现深度优先搜索算法。分享给大家供大家参考,具体如下:
深度优先搜索的实现原理:
实现代码:
<?php class Search_Method { //无向图的数组描述 private $dfs_save; //全局记录数组 private $arr; //控制分支- private $k = 0; public function __construct() { $this->dfs_save = array( array(0,1,1,1,0,0,0,0,0), array(1,0,0,0,1,0,0,0,0), array(1,0,0,0,0,1,0,0,0), array(1,0,0,0,0,0,1,0,0), array(0,1,0,0,0,1,0,0,1), array(0,0,1,0,1,0,0,1,0), array(0,0,0,1,0,0,0,0,0), array(0,0,0,0,0,1,0,0,0), array(0,0,0,0,1,0,0,0,0), ); $this->arr = array(); } //深度优先搜索的递归实现方法 public function dfs($v) { //对顶点做一些操作 echo str_repeat("-",$this->k); echo 'V'.($v+1).'<br>'; //记录已访问的顶点 $this->arr[]= $v; //查找与顶点相连接的顶点,如果存在就继续深度优先搜索 for($i=0;$i<9;$i++) { if(!in_array($i,$this->arr)&&$this->dfs_save[$v][$i]==1) { $this->k++; $this->dfs($i); } } $this->k--; return; } } ?>
实现输出结果:
V1 -V2 --V5 ---V6 ----V3 ----V8 ---V9 -V4 --V7
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