H 指数(English) [h-index].html

<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 compute the researcher&#39;s <code>h</code><strong>-index</strong>.</p>

<p>According to the <a href="https://en.wikipedia.org/wiki/H-index" target="_blank">definition of h-index on Wikipedia</a>: A scientist has an index <code>h</code> if <code>h</code> of their <code>n</code> papers have at least <code>h</code> citations each, and the other <code>n &minus; h</code> papers have no more than <code>h</code> citations each.</p>

<p>If there are several possible values for <code>h</code>, the maximum one is taken as the <code>h</code><strong>-index</strong>.</p>

<p>&nbsp;</p>
<p><strong>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>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>