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leetcode/problem/x-of-a-kind-in-a-deck-of-cards.html

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+<p>In a deck of cards, each card has an integer written on it.</p>
+
+<p>Return <code>true</code> if and only if you can choose <code>X &gt;= 2</code> such that it is possible to split the entire deck into 1 or more groups of cards, where:</p>
+
+<ul>
+	<li>Each group has exactly <code>X</code> cards.</li>
+	<li>All the cards in each group have the same integer.</li>
+</ul>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> deck = [1,2,3,4,4,3,2,1]
+<strong>Output:</strong> true
+<strong>Explanation</strong>: Possible partition [1,1],[2,2],[3,3],[4,4].
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> deck = [1,1,1,2,2,2,3,3]
+<strong>Output:</strong> false
+<strong>Explanation</strong>: No possible partition.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= deck.length &lt;= 10<sup>4</sup></code></li>
+	<li><code>0 &lt;= deck[i] &lt; 10<sup>4</sup></code></li>
+</ul>