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2023-12-09 18:42:21 +08:00
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leetcode/problem/insert-delete-getrandom-o1-duplicates-allowed.html
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<p><code>RandomizedCollection</code> is a data structure that contains a collection of numbers, possibly duplicates (i.e., a multiset). It should support inserting and removing specific elements and also removing a random element.</p>
<p><code>RandomizedCollection</code> is a data structure that contains a collection of numbers, possibly duplicates (i.e., a multiset). It should support inserting and removing specific elements and also reporting a random element.</p>
<p>Implement the <code>RandomizedCollection</code> class:</p>
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<li><code>RandomizedCollection()</code> Initializes the empty <code>RandomizedCollection</code> object.</li>
<li><code>bool insert(int val)</code> Inserts an item <code>val</code> into the multiset, even if the item is already present. Returns <code>true</code> if the item is not present, <code>false</code> otherwise.</li>
<li><code>bool remove(int val)</code> Removes an item <code>val</code> from the multiset if present. Returns <code>true</code> if the item is present, <code>false</code> otherwise. Note that if <code>val</code> has multiple occurrences in the multiset, we only remove one of them.</li>
<li><code>int getRandom()</code> Returns a random element from the current multiset of elements. The probability of each element being returned is <strong>linearly related</strong> to the number of same values the multiset contains.</li>
<li><code>int getRandom()</code> Returns a random element from the current multiset of elements. The probability of each element being returned is <strong>linearly related</strong> to the number of the same values the multiset contains.</li>
</ul>
<p>You must implement the functions of the class such that each function works on <strong>average</strong> <code>O(1)</code> time complexity.</p>
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<p><strong>Note:</strong> The test cases are generated such that <code>getRandom</code> will only be called if there is <strong>at least one</strong> item in the <code>RandomizedCollection</code>.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<p><strong class="example">Example 1:</strong></p>
<pre>
<strong>Input</strong>