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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <meta name="generator" content= "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org"> <title>random_sample_n</title> <link href="../cppreference.css" rel="stylesheet" type="text/css"></head><body><table> <tr> <td> <div class="body-content"> <div class="header-box"> <a href="../index.html">cppreference.com</a> > <a href= "index.html">C++ Algorithms</a> > <a href= "random_sample_n.html">random_sample_n</a> </div> <div class="name-format"> random_sample_n </div> <div class="syntax-name-format"> Syntax: </div> <pre class="syntax-box"> #include <algorithm> iterator random_sample_n( iterator start, iterator end, iterator result, size_t N ); iterator random_sample_n( iterator start, iterator end, iterator result, size_t N, RandomNumberGenerator& rnd );</pre> <p>The random_sample_n() algorithm randomly copies <em>N</em> elements from [<em>start</em>,<em>end</em>) to <em>result</em>. Elements are chosen with uniform probability and elements from the input range will appear at most once in the output range. <strong>Element order is preserved</strong> from the input range to the output range.</p> <p>If a random number generator function object <em>rnd</em> is supplied, then it will be used instead of an internal random number generator.</p> <p>The return value of random_sample_n() is an iterator to the end of the output range.</p> <p>random_sample_n() runs in <a href="../complexity.html">linear time</a>.</p> <div class="related-name-format"> Related topics: </div> <div class="related-content"> <a href="next_permutation.html">next_permutation</a><br> <a href="prev_permutation.html">prev_permutation</a><br> <a href="random_sample.html">random_sample</a><br> <a href="random_shuffle.html">random_shuffle</a> </div> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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