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71. Simplify Path
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| # https://leetcode.com/problems/simplify-path/description/ | |
| # 71. Simplify Path | |
| # Given a string path, which is an absolute path (starting with a slash '/') to a file or directory in a Unix-style file system, convert it to the simplified canonical path. | |
| # In a Unix-style file system, a period '.' refers to the current directory, a double period '..' refers to the directory up a level, and any multiple consecutive slashes (i.e. '//') are treated as a single slash '/'. For this problem, any other format of periods such as '...' are treated as file/directory names. | |
| # The canonical path should have the following format: | |
| # The path starts with a single slash '/'. | |
| # Any two directories are separated by a single slash '/'. | |
| # The path does not end with a trailing '/'. | |
| # The path only contains the directories on the path from the root directory to the target file or directory (i.e., no period '.' or double period '..') | |
| # Return the simplified canonical path. | |
| # Example 1: | |
| # Input: path = "/home/" | |
| # Output: "/home" | |
| # Explanation: Note that there is no trailing slash after the last directory name. | |
| # Example 2: | |
| # Input: path = "/../" | |
| # Output: "/" | |
| # Explanation: Going one level up from the root directory is a no-op, as the root level is the highest level you can go. | |
| # Example 3: | |
| # Input: path = "/home//foo/" | |
| # Output: "/home/foo" | |
| # Explanation: In the canonical path, multiple consecutive slashes are replaced by a single one. | |
| # Constraints: | |
| # 1 <= path.length <= 3000 | |
| # path consists of English letters, digits, period '.', slash '/' or '_'. | |
| # path is a valid absolute Unix path. | |
| # @param {String} path | |
| # @return {String} | |
| def simplify_path(path) | |
| dirs = path.split('/').drop(1) | |
| output = [] | |
| dirs.each do |dir| | |
| # do nothing for '' and '.' | |
| case dir | |
| when '' | |
| when '.' | |
| when '..' | |
| output.pop | |
| else | |
| output << dir | |
| end | |
| end | |
| '/' + output.join('/') | |
| end | |
| # Runtime | |
| # 65ms | |
| # Beats 70.15%of users with Ruby | |
| # Memory | |
| # 211.13MB | |
| # Beats 13.43%of users with Ruby |
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