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permutations.php
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47 lines (28 loc) · 822 Bytes
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<?php
class Solution {
private $result = [];
/**
* 给定一个不含重复数字的数组 nums ，返回其 所有可能的全排列 。你可以 按任意顺序 返回答案。
* @param Integer[] $nums
* @return Integer[][]
*/
function permute($nums) {
$this->backTrack($nums, 0, []);
return $this->result;
}
function backTrack($nums, $step, $path) {
if($step == count($nums)){
$arr = $path;
$this->result[] = $arr;
return;
}
for ($i = 0; $i < count($nums); $i++){
if(in_array($nums[$i], $path)){
continue;
}
$path[] = $nums[$i];
$this->backTrack($nums, $step + 1, $path);
array_pop($path);
}
}
}