更新风车旋转排序算法

Author: pfinal-nc

README-EN.md

@@ -70,6 +70,7 @@
 │         └──  Judge.php 
 │         └──  Factorial.php 
 |         └──  HashTable.php
+|         └──  RotateSort.php  
 │     
 ├──LICENSE 
 └──README.md

README.md

@@ -85,6 +85,7 @@
 │         └──  Judge.php              面试题之扑克牌中任选五张判断是不是顺子
 │         └──  Factorial.php          面试题之N的阶乘末尾有多少个0
 |         └──  HashTable.php          HashTable
+|         └──  RotateSort.php         面试题之风车旋转排序算法
 │     
 ├──LICENSE
 └──README.md

src/Other/RotateSort.php

@@ -0,0 +1,166 @@
+<?php
+	/**
+	 * ----------------------------------------
+	 * | Created By algorithm-php                 |
+	 * | User: 南丞 <[email protected]>     |
+	 * | Date: 2019/10/11                      |
+	 * | Time: 下午2:56                        |
+	 * ----------------------------------------
+	 * |    _____  ______ _             _     |
+	 * |   |  __ \|  ____(_)           | |    |
+	 * |   | |__) | |__   _ _ __   __ _| |    |
+	 * |   |  ___/|  __| | | '_ \ / _` | |    |
+	 * |   | |    | |    | | | | | (_| | |    |
+	 * |   |_|    |_|    |_|_| |_|\__,_|_|    |
+	 * ----------------------------------------
+	 * 说明:  面试遇到一个写一个函数 让输出效果 如风车一样旋转 如下
+	 *  foo(4)  逆时针
+	 *   16,15,14,13
+	 *   5, 4, 3, 12
+	 *   6, 1, 2, 11
+	 *   7, 8, 9, 10
+	 * foo(4)  顺顺时针
+	 *   7, 8, 9, 10
+	 *   6, 1, 2, 11
+	 *   5, 4, 3, 12
+	 *   16,15, 14,13
+	 *
+	 */
+	
+	$num = 4;
+	$arr = foo($num);
+	for ($i = 0; $i < $num; $i++) {
+		echo implode(',', $arr[$i])."<br>";
+	}
+	
+	/**
+	 * @param $num
+	 * @param int $direction 方向  1 为  顺时针旋转 2 为逆时针旋转
+	 * @return mixed
+	 */
+	function foo($num, $direction = 1)
+	{
+		//填充map
+		$data = new stdClass();
+		$data->x = 1;
+		if ($direction == 1) {
+			$data->y = $num;
+		} elseif ($direction == 2) {
+			$data->y = 1;
+		}
+		$data->num = $num;
+		$data->len = $num * $num;
+		$data->tmp_data = [];
+		$data->rate = 1;//方向
+		$data->struct = create_struct($num);
+		for ($i = $data->len; $i >= 1; $i--) {
+			$data->i = $i;
+			$key = change_key($data, $direction);
+			$data->tmp_data[$key] = $i;
+			unset($data->struct[$key]);
+		}
+		
+		//根据y坐标分组
+		$data->struct = create_struct($num);
+		foreach ($data->tmp_data as $key => $value) {
+			$data->struct[$key] = $value;
+		}
+		for ($i = 1; $i <= $data->num; $i++) {
+			$start = ($i - 1) * $data->num;
+			$end = $data->num;
+			$slice = array_slice($data->struct, $start, $end);
+			$data->slice[] = $slice;
+		}
+		
+		return $data->slice;
+	}
+	
+	function create_struct($num)
+	{
+		$struct = [];
+		for ($i = 1; $i <= $num; $i++) {
+			//嵌套
+			for ($m = 1; $m <= $num; $m++) {
+				$key = $m.','.$i;
+				$struct[$key] = '';
+			}
+		}
+		
+		return $struct;
+	}
+	
+	function change_key($data, $direction)
+	{
+		$key = $data->x.','.$data->y;
+		if (isset($data->struct[$key])) {
+			return $key;
+		}
+		switch ($data->rate) {
+			// LEFT 方向
+			case 1:
+				$data->tmp_x = $data->x + 1;
+				$key = $data->tmp_x.','.$data->y;
+				if (isset($data->struct[$key])) {
+					$data->x = $data->tmp_x;
+					
+					return $key;
+				} else {
+					if ($direction = 1) {
+						$data->rate = 4;
+					} elseif ($direction = 2) {
+						$data->rate = 2;
+					}
+				}
+				break;
+			// DOWN 方向
+			case 2:
+				$data->tmp_y = $data->y + 1;
+				$key = $data->x.','.$data->tmp_y;
+				if (isset($data->struct[$key])) {
+					$data->y = $data->tmp_y;
+					
+					return $key;
+				} else {
+					if ($direction = 1) {
+						$data->rate = 1;
+					} elseif ($direction = 2) {
+						$data->rate = 3;
+					}
+				}
+				break;
+			// RIGHT 方向
+			case 3:
+				$data->tmp_x = $data->x - 1;
+				$key = $data->tmp_x.','.$data->y;
+				if (isset($data->struct[$key])) {
+					$data->x = $data->tmp_x;
+					
+					return $key;
+				} else {
+					if ($direction = 1) {
+						$data->rate = 2;
+					} elseif ($direction = 2) {
+						$data->rate = 4;
+					}
+				}
+				break;
+			// UP 方向
+			case 4:
+				$data->tmp_y = $data->y - 1;
+				$key = $data->x.','.$data->tmp_y;
+				if (isset($data->struct[$key])) {
+					$data->y = $data->tmp_y;
+					
+					return $key;
+				} else {
+					if ($direction = 1) {
+						$data->rate = 3;
+					} elseif ($direction = 2) {
+						$data->rate = 1;
+					}
+				}
+				break;
+		}
+		
+		return change_key($data, $direction);
+	}