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49 lines
2.4 KiB
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<p>Given a string <code>path</code>, which is an <strong>absolute path</strong> (starting with a slash <code>'/'</code>) to a file or directory in a Unix-style file system, convert it to the simplified <strong>canonical path</strong>.</p>
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<p>In a Unix-style file system, a period <code>'.'</code> refers to the current directory, a double period <code>'..'</code> refers to the directory up a level, and any multiple consecutive slashes (i.e. <code>'//'</code>) are treated as a single slash <code>'/'</code>. For this problem, any other format of periods such as <code>'...'</code> are treated as file/directory names.</p>
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<p>The <strong>canonical path</strong> should have the following format:</p>
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<ul>
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<li>The path starts with a single slash <code>'/'</code>.</li>
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<li>Any two directories are separated by a single slash <code>'/'</code>.</li>
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<li>The path does not end with a trailing <code>'/'</code>.</li>
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<li>The path only contains the directories on the path from the root directory to the target file or directory (i.e., no period <code>'.'</code> or double period <code>'..'</code>)</li>
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</ul>
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<p>Return <em>the simplified <strong>canonical path</strong></em>.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> path = "/home/"
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<strong>Output:</strong> "/home"
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<strong>Explanation:</strong> Note that there is no trailing slash after the last directory name.
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> path = "/../"
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<strong>Output:</strong> "/"
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<strong>Explanation:</strong> Going one level up from the root directory is a no-op, as the root level is the highest level you can go.
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</pre>
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<p><strong class="example">Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> path = "/home//foo/"
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<strong>Output:</strong> "/home/foo"
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<strong>Explanation:</strong> In the canonical path, multiple consecutive slashes are replaced by a single one.
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 <= path.length <= 3000</code></li>
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<li><code>path</code> consists of English letters, digits, period <code>'.'</code>, slash <code>'/'</code> or <code>'_'</code>.</li>
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<li><code>path</code> is a valid absolute Unix path.</li>
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</ul>
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