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+<h2><a href="https://leetcode.com/problems/h-index">274. H-Index</a></h2><h3>Medium</h3><hr><p>Given an array of integers <code>citations</code> where <code>citations[i]</code> is the number of citations a researcher received for their <code>i<sup>th</sup></code> paper, return <em>the researcher&#39;s h-index</em>.</p>
+
+<p>According to the <a href="https://en.wikipedia.org/wiki/H-index" target="_blank">definition of h-index on Wikipedia</a>: The h-index is defined as the maximum value of <code>h</code> such that the given researcher has published at least <code>h</code> papers that have each been cited at least <code>h</code> times.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> citations = [3,0,6,1,5]
+<strong>Output:</strong> 3
+<strong>Explanation:</strong> [3,0,6,1,5] means the researcher has 5 papers in total and each of them had received 3, 0, 6, 1, 5 citations respectively.
+Since the researcher has 3 papers with at least 3 citations each and the remaining two with no more than 3 citations each, their h-index is 3.
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> citations = [1,3,1]
+<strong>Output:</strong> 1
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>n == citations.length</code></li>
+	<li><code>1 &lt;= n &lt;= 5000</code></li>
+	<li><code>0 &lt;= citations[i] &lt;= 1000</code></li>
+</ul>