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    <p>Sorting is the process of applying some order to a collection of items. There are various <a href="/questions/tagged/algorithms" class="post-tag" title="show questions tagged &#39;algorithms&#39;" rel="tag">algorithms</a> for doing this, including <a href="/questions/tagged/mergesort" class="post-tag" title="show questions tagged &#39;mergesort&#39;" rel="tag">mergesort</a>, <a href="/questions/tagged/quicksort" class="post-tag" title="show questions tagged &#39;quicksort&#39;" rel="tag">quicksort</a>, and <a href="/questions/tagged/heapsort" class="post-tag" title="show questions tagged &#39;heapsort&#39;" rel="tag">heapsort</a>.</p> <p>From the <a href="http://en.wikipedia.org/wiki/Sorting_algorithm" rel="nofollow noreferrer">Sorting Algorithms Wikipedia entry</a>:</p> <blockquote> <p>In <a href="/questions/tagged/computer-science" class="post-tag" title="show questions tagged &#39;computer-science&#39;" rel="tag">computer-science</a> a <a href="/questions/tagged/sorting-algorithm" class="post-tag" title="show questions tagged &#39;sorting-algorithm&#39;" rel="tag">sorting-algorithm</a> is an <em>algorithm</em> that puts elements of a list in a certain order. The most-used orders are <a href="/questions/tagged/numerical" class="post-tag" title="show questions tagged &#39;numerical&#39;" rel="tag">numerical</a> order and <a href="/questions/tagged/lexicographical" class="post-tag" title="show questions tagged &#39;lexicographical&#39;" rel="tag">lexicographical</a> order. Efficient sorting is important for optimizing the use of other algorithms (such as search and merge algorithms) that require sorted lists to work correctly; it is also often useful for <a href="/questions/tagged/canonicalizing" class="post-tag" title="show questions tagged &#39;canonicalizing&#39;" rel="tag">canonicalizing</a> data and for producing human-readable <a href="/questions/tagged/output" class="post-tag" title="show questions tagged &#39;output&#39;" rel="tag">output</a>. More formally, the output must satisfy two conditions:</p> <ol> <li>The output is in nondecreasing order (each element is no smaller than the previous element according to the desired total order);</li> <li>The output is a permutation (reordering) of the input.</li> </ol> </blockquote> <p><strong>Related tags:</strong></p> <ul> <li><a href="/questions/tagged/alphabetical-sort" class="post-tag" title="show questions tagged &#39;alphabetical-sort&#39;" rel="tag">alphabetical-sort</a></li> <li><a href="/questions/tagged/bubble-sort" class="post-tag" title="show questions tagged &#39;bubble-sort&#39;" rel="tag">bubble-sort</a></li> <li><a href="/questions/tagged/bucket-sort" class="post-tag" title="show questions tagged &#39;bucket-sort&#39;" rel="tag">bucket-sort</a></li> <li><a href="/questions/tagged/heapsort" class="post-tag" title="show questions tagged &#39;heapsort&#39;" rel="tag">heapsort</a></li> <li><a href="/questions/tagged/insertion-sort" class="post-tag" title="show questions tagged &#39;insertion-sort&#39;" rel="tag">insertion-sort</a></li> <li><a href="/questions/tagged/mergesort" class="post-tag" title="show questions tagged &#39;mergesort&#39;" rel="tag">mergesort</a></li> <li><a href="/questions/tagged/natural-sort" class="post-tag" title="show questions tagged &#39;natural-sort&#39;" rel="tag">natural-sort</a></li> <li><a href="/questions/tagged/quicksort" class="post-tag" title="show questions tagged &#39;quicksort&#39;" rel="tag">quicksort</a></li> <li><a href="/questions/tagged/radix-sort" class="post-tag" title="show questions tagged &#39;radix-sort&#39;" rel="tag">radix-sort</a></li> <li><a href="/questions/tagged/selection-sort" class="post-tag" title="show questions tagged &#39;selection-sort&#39;" rel="tag">selection-sort</a></li> <li><a href="/questions/tagged/shellsort" class="post-tag" title="show questions tagged &#39;shellsort&#39;" rel="tag">shellsort</a></li> <li><a href="/questions/tagged/stable-sort" class="post-tag" title="show questions tagged &#39;stable-sort&#39;" rel="tag">stable-sort</a></li> <li><a href="/questions/tagged/topological-sort" class="post-tag" title="show questions tagged &#39;topological-sort&#39;" rel="tag">topological-sort</a></li> <li><a href="/questions/tagged/counting-sort" class="post-tag" title="show questions tagged &#39;counting-sort&#39;" rel="tag">counting-sort</a></li> <li><a href="https://en.wikipedia.org/wiki/Quantum_sort" rel="nofollow noreferrer">Quantum-sort</a></li> </ul>
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