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28 lines
1.5 KiB
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<p>Given a string <code>path</code>, where <code>path[i] = 'N'</code>, <code>'S'</code>, <code>'E'</code> or <code>'W'</code>, each representing moving one unit north, south, east, or west, respectively. You start at the origin <code>(0, 0)</code> on a 2D plane and walk on the path specified by <code>path</code>.</p>
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<p>Return <code>true</code> <em>if the path crosses itself at any point, that is, if at any time you are on a location you have previously visited</em>. Return <code>false</code> otherwise.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2020/06/10/screen-shot-2020-06-10-at-123929-pm.png" style="width: 400px; height: 358px;" />
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<pre>
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<strong>Input:</strong> path = "NES"
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<strong>Output:</strong> false
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<strong>Explanation:</strong> Notice that the path doesn't cross any point more than once.
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</pre>
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<p><strong>Example 2:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2020/06/10/screen-shot-2020-06-10-at-123843-pm.png" style="width: 400px; height: 339px;" />
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<pre>
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<strong>Input:</strong> path = "NESWW"
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<strong>Output:</strong> true
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<strong>Explanation:</strong> Notice that the path visits the origin twice.</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 <= 10<sup>4</sup></code></li>
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<li><code>path[i]</code> is either <code>'N'</code>, <code>'S'</code>, <code>'E'</code>, or <code>'W'</code>.</li>
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</ul>
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