{ "data": { "question": { "questionId": "1720", "questionFrontendId": "1598", "categoryTitle": "Algorithms", "boundTopicId": 425382, "title": "Crawler Log Folder", "titleSlug": "crawler-log-folder", "content": "

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

\n\n

The operations are described below:

\n\n\n\n

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

\n\n

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

\n\n

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

\n\n

 

\n

Example 1:

\n\n

\"\"

\n\n
\nInput: logs = ["d1/","d2/","../","d21/","./"]\nOutput: 2\nExplanation: Use this change folder operation "../" 2 times and go back to the main folder.\n
\n\n

Example 2:

\n\n

\"\"

\n\n
\nInput: logs = ["d1/","d2/","./","d3/","../","d31/"]\nOutput: 3\n
\n\n

Example 3:

\n\n
\nInput: logs = ["d1/","../","../","../"]\nOutput: 0\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "文件夹操作日志搜集器", "translatedContent": "

每当用户执行变更文件夹操作时，LeetCode 文件系统都会保存一条日志记录。

\n\n

下面给出对变更操作的说明：

\n\n\n\n

给你一个字符串列表 logs ，其中 logs[i] 是用户在 ith 步执行的操作。

\n\n

文件系统启动时位于主文件夹，然后执行 logs 中的操作。

\n\n

执行完所有变更文件夹操作后，请你找出 返回主文件夹所需的最小步数 。

\n\n

 

\n\n

示例 1：

\n\n

\"\"

\n\n
输入：logs = ["d1/","d2/","../","d21/","./"]\n输出：2\n解释：执行 "../" 操作变更文件夹 2 次，即可回到主文件夹\n
\n\n

示例 2：

\n\n

\"\"

\n\n
输入：logs = ["d1/","d2/","./","d3/","../","d31/"]\n输出：3\n
\n\n

示例 3：

\n\n
输入：logs = ["d1/","../","../","../"]\n输出：0\n
\n\n

 

\n\n

提示：

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