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<h2><a name="push_heap" id="push_heap">push_heap</a></h2>
<div class="level2">
<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <algorithm></span>
<span class="kw4">void</span> push_heap<span class="br0">(</span> random_access_iterator start<span class="sy0">,</span> random_access_iterator end <span class="br0">)</span><span class="sy0">;</span>
<span class="kw4">void</span> push_heap<span class="br0">(</span> random_access_iterator start<span class="sy0">,</span> random_access_iterator end<span class="sy0">,</span> StrictWeakOrdering cmp <span class="br0">)</span><span class="sy0">;</span></pre>
<p>
The push_heap() function adds an element (defined as the last element before
end) to a heap (defined as the range of elements between [start,''end-1).
</p>
<p>
If the strict weak ordering comparison function object cmp is given, then it is
used instead of the < operator to compare elements.
</p>
<p>
push_heap() runs in <a href="../../complexity.html" class="wikilink1" title="complexity">logarithmic time</a>.
</p>
<p>
Example
</p>
<pre class="c code c++" style="font-family:monospace;"><span class="co1">// range heap example</span>
<span class="co2">#include <iostream></span>
<span class="co2">#include <algorithm></span>
<span class="co2">#include <vector></span>
using namespace std<span class="sy0">;</span>
<span class="kw4">int</span> main <span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw4">int</span> myints<span class="br0">[</span><span class="br0">]</span> <span class="sy0">=</span> <span class="br0">{</span>10<span class="sy0">,</span>20<span class="sy0">,</span>30<span class="sy0">,</span>5<span class="sy0">,</span>15<span class="br0">}</span><span class="sy0">;</span>
vector<span class="sy0"><</span>int<span class="sy0">></span> v<span class="br0">(</span>myints<span class="sy0">,</span>myints<span class="sy0">+</span>5<span class="br0">)</span><span class="sy0">;</span>
vector<span class="sy0"><</span>int<span class="sy0">>::</span><span class="me2">iterator</span> it<span class="sy0">;</span>
make_heap <span class="br0">(</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">,</span>v.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">"initial max heap : "</span> <span class="sy0"><<</span> v.<span class="me1">front</span><span class="br0">(</span><span class="br0">)</span> <span class="sy0"><<</span> endl<span class="sy0">;</span>
pop_heap <span class="br0">(</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">,</span>v.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy0">;</span> v.<span class="me1">pop_back</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">"max heap after pop : "</span> <span class="sy0"><<</span> v.<span class="me1">front</span><span class="br0">(</span><span class="br0">)</span> <span class="sy0"><<</span> endl<span class="sy0">;</span>
v.<span class="me1">push_back</span><span class="br0">(</span>99<span class="br0">)</span><span class="sy0">;</span> push_heap <span class="br0">(</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">,</span>v.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">"max heap after push: "</span> <span class="sy0"><<</span> v.<span class="me1">front</span><span class="br0">(</span><span class="br0">)</span> <span class="sy0"><<</span> endl<span class="sy0">;</span>
sort_heap <span class="br0">(</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">,</span>v.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">"final sorted range :"</span><span class="sy0">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">unsigned</span> i<span class="sy0">=</span><span class="nu0">0</span><span class="sy0">;</span> i<span class="sy0"><</span>v.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span> i<span class="sy0">++</span><span class="br0">)</span> <a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">" "</span> <span class="sy0"><<</span> v<span class="br0">[</span>i<span class="br0">]</span><span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> endl<span class="sy0">;</span>
<span class="kw1">return</span> <span class="nu0">0</span><span class="sy0">;</span>
<span class="br0">}</span></pre>
<p>
Output:
initial max heap : 30
</p>
<p>
max heap after pop : 20
</p>
<p>
max heap after push: 99
</p>
<p>
final sorted range : 5 10 15 20 99
</p>
<p>
Related Topics: <a href="../../stl/algorithm/is_heap.html" class="wikilink1" title="stl:algorithm:is_heap">is_heap</a>, <a href="../../stl/algorithm/make_heap.html" class="wikilink1" title="stl:algorithm:make_heap">make_heap</a>, <a href="../../stl/algorithm/pop_heap.html" class="wikilink1" title="stl:algorithm:pop_heap">pop_heap</a>, <a href="../../stl/algorithm/sort_heap.html" class="wikilink1" title="stl:algorithm:sort_heap">sort_heap</a>
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