diff --git a/problems/0001.两数之和.md b/problems/0001.两数之和.md index 31a808b0..5be94996 100644 --- a/problems/0001.两数之和.md +++ b/problems/0001.两数之和.md @@ -187,7 +187,23 @@ var twoSum = function (nums, target) { }; ``` +php +```php +function twoSum(array $nums, int $target): array +{ + for ($i = 0; $i < count($nums);$i++) { + // 计算剩下的数 + $residue = $target - $nums[$i]; + // 匹配的index,有则返回index, 无则返回false + $match_index = array_search($residue, $nums); + if ($match_index !== false && $match_index != $i) { + return array($i, $match_index); + } + } + return []; +} +``` ----------------------- diff --git a/problems/0015.三数之和.md b/problems/0015.三数之和.md index 5b77a170..36abb58c 100644 --- a/problems/0015.三数之和.md +++ b/problems/0015.三数之和.md @@ -354,6 +354,47 @@ def is_valid(strs) end ``` +php: + +```php +function threeSum(array $nums): array +{ + $result = []; + $length = count($nums); + if ($length < 3) { + return []; + } + sort($nums); + for ($i = 0; $i < $length; $i++) { + // 如果大于0结束 + if ($nums[$i] > 0) break; + // 去重 + if ($i > 0 && $nums[$i] == $nums[$i - 1]) continue; + $left = $i + 1; + $right = $length - 1; + // 比较 + while ($left < $right) { + $sum = $nums[$i] + $nums[$left] + $nums[$right]; + if ($sum < 0) { + $left++; + } elseif ($sum > 0) { + $right--; + } else { + array_push($result, [$nums[$i], $nums[$left], $nums[$right]]); + while ($left < $right && $nums[$left] == $nums[$left + 1]) $left++; + while ($left < $right && $nums[$right - 1] == $nums[$right]) $right--; + $left++; + $right--; + } + } + } + + return $result; +} +``` + + + ----------------------- * 作者微信:[程序员Carl](https://mp.weixin.qq.com/s/b66DFkOp8OOxdZC_xLZxfw) * B站视频:[代码随想录](https://space.bilibili.com/525438321)