-
Notifications
You must be signed in to change notification settings - Fork 0
/
CrawlerLogFolder.java
52 lines (44 loc) · 1.63 KB
/
CrawlerLogFolder.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
package stack;
import utils.LeetCode;
import utils.Level;
import java.util.Stack;
/**
* The Leetcode file system keeps a log each time some user performs a change folder operation.
* <p>
* The operations are described below:
* <p>
* "../" : 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.
* <p>
* The file system starts in the main folder, then the operations in logs are performed.
* <p>
* Return the minimum number of operations needed to go back to the main folder after the change folder operations.
*/
/**
* <b>Results</b>
*Runtime: 1 ms, faster than 76.24% of Java online submissions for Crawler Log Folder.
* Memory Usage: 38.7 MB, less than 52.92% of Java online submissions for Crawler Log Folder.
*/
@LeetCode(no = 1598,
title = "Crawler Log Folder"
, url = "https://leetcode.com/problems/crawler-log-folder/",
level = Level.EASY)
public class CrawlerLogFolder {
public int minOperations(String[] logs) {
Stack<String> folders = new Stack<>();
for (String s : logs) {
switch (s) {
case "../":
if (!folders.isEmpty())
folders.pop();
case "./":
continue;
default:
folders.push(s);
}
}
return folders.size();
}
}