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subsets.php
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50 lines (28 loc) · 861 Bytes
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<?php
class Solution
{
private $result = [];
/**
* 给你一个整数数组 nums ，数组中的元素 互不相同 。返回该数组所有可能的子集（幂集）。
* 解集 不能 包含重复的子集。你可以按 任意顺序 返回解集。
* @param Integer[] $nums
* @return Integer[][]
*/
function subsets($nums) {
$this->backTrack($nums, 0, []);
return $this->result;
}
function backTrack($nums, $step, $path)
{
if($step === count($nums)){
$this->result[] = $path;
return;
}
$this->backTrack($nums, $step + 1, $path);
$path[] = $nums[$step];
$this->backTrack($nums, $step + 1, $path);
unset($path[count($path) - 1]);
}
}
$model = new Solution();
var_dump($model->subsets([1, 2, 3]));