DEV Community

Cover image for 1598. Crawler Log Folder
MD ARIFUL HAQUE
MD ARIFUL HAQUE

Posted on • Edited on

2

1598. Crawler Log Folder

1598. Crawler Log Folder

Easy

The Leetcode file system keeps a log each time some user performs a change folder operation.

The operations are described below:

  • "../" : Move to the parent folder of the current folder. (If you are already in the main folder, remain in the same folder).
  • "./" : Remain in the same folder.
  • "x/" : Move to the child folder named x (This folder is guaranteed to always exist).

You are given a list of strings logs where logs[i] is the operation performed by the user at the ith step.

The file system starts in the main folder, then the operations in logs are performed.

Return the minimum number of operations needed to go back to the main folder after the change folder operations.

Example 1:

sample_11_1957

  • Input: logs = ["d1/","d2/","../","d21/","./"]
  • Output: 2
  • Explanation: Use this change folder operation "../" 2 times and go back to the main folder.

Example 2:

sample_22_1957

  • Input: logs = ["d1/","d2/","./","d3/","../","d31/"]
  • Output: 3

Example 3:

  • Input: logs = ["d1/","../","../","../"]
  • Output: 0

Constraints:

  • 1 <= logs.length <= 103
  • 2 <= logs[i].length <= 10
  • logs[i] contains lowercase English letters, digits, '.', and '/'.
  • logs[i] follows the format described in the statement.
  • Folder names consist of lowercase English letters and digits.

Solution:

class Solution {

    /**
     * @param String[] $logs
     * @return Integer
     */
    function minOperations($logs) {
        $depth = 0;

        foreach ($logs as $log) {
            if ($log == "../") {
                if ($depth > 0) {
                    $depth--;
                }
            } elseif ($log != "./") {
                $depth++;
            }
        }

        return $depth;
    }
}
Enter fullscreen mode Exit fullscreen mode

Contact Links

If you found this series helpful, please consider giving the repository a star on GitHub or sharing the post on your favorite social networks 😍. Your support would mean a lot to me!

If you want more helpful content like this, feel free to follow me:

Heroku

Simplify your DevOps and maximize your time.

Since 2007, Heroku has been the go-to platform for developers as it monitors uptime, performance, and infrastructure concerns, allowing you to focus on writing code.

Learn More

Top comments (0)

Image of Timescale

Timescale – the developer's data platform for modern apps, built on PostgreSQL

Timescale Cloud is PostgreSQL optimized for speed, scale, and performance. Over 3 million IoT, AI, crypto, and dev tool apps are powered by Timescale. Try it free today! No credit card required.

Try free