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39 lines
1.5 KiB
HTML
39 lines
1.5 KiB
HTML
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<p>Design a HashSet without using any built-in hash table libraries.</p>
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<p>Implement <code>MyHashSet</code> class:</p>
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<ul>
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<li><code>void add(key)</code> Inserts the value <code>key</code> into the HashSet.</li>
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<li><code>bool contains(key)</code> Returns whether the value <code>key</code> exists in the HashSet or not.</li>
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<li><code>void remove(key)</code> Removes the value <code>key</code> in the HashSet. If <code>key</code> does not exist in the HashSet, do nothing.</li>
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</ul>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input</strong>
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["MyHashSet", "add", "add", "contains", "contains", "add", "contains", "remove", "contains"]
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[[], [1], [2], [1], [3], [2], [2], [2], [2]]
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<strong>Output</strong>
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[null, null, null, true, false, null, true, null, false]
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<strong>Explanation</strong>
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MyHashSet myHashSet = new MyHashSet();
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myHashSet.add(1); // set = [1]
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myHashSet.add(2); // set = [1, 2]
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myHashSet.contains(1); // return True
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myHashSet.contains(3); // return False, (not found)
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myHashSet.add(2); // set = [1, 2]
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myHashSet.contains(2); // return True
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myHashSet.remove(2); // set = [1]
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myHashSet.contains(2); // return False, (already removed)</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>0 <= key <= 10<sup>6</sup></code></li>
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<li>At most <code>10<sup>4</sup></code> calls will be made to <code>add</code>, <code>remove</code>, and <code>contains</code>.</li>
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</ul>
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