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<div class="headertitle"><div class="title">fenwick_tree.cpp File Reference</div></div>
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<p>Fenwick tree.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;cassert&gt;</code><br />
<code>#include &lt;iostream&gt;</code><br />
<code>#include &lt;vector&gt;</code><br />
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Include dependency graph for fenwick_tree.cpp:</div>
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Classes</h2></td></tr>
<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d91/class_fenwick_tree.html">FenwickTree</a></td></tr>
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Functions</h2></td></tr>
<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../d6/d2e/fenwick__tree_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Fenwick tree. </p>
<p>A Fenwick tree or binary indexed tree is a data structure that can efficiently update elements and calculate prefix sums in a table of numbers. </p>
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<a id="ae66f6b31b5ad750f1fe042a706a4e3d4" name="ae66f6b31b5ad750f1fe042a706a4e3d4"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&#160;</a></span>main()</h2>
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<td class="memname">int main </td>
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<td class="paramtype">void&#160;</td>
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<p>Main function </p>
<div class="fragment"><div class="line"><span class="lineno"> 69</span> {</div>
<div class="line"><span class="lineno"> 70</span> <span class="keywordtype">int</span> n = 5;</div>
<div class="line"><span class="lineno"> 71</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector&lt;int&gt;</a> arr = {1, 2, 3, 4, 5};</div>
<div class="line"><span class="lineno"> 72</span> <a class="code hl_class" href="../../dd/d91/class_fenwick_tree.html">FenwickTree</a> fenwick_tree(arr);</div>
<div class="line"><span class="lineno"> 73</span> </div>
<div class="line"><span class="lineno"> 74</span> assert(fenwick_tree.sum_range(0, 0) == 1);</div>
<div class="line"><span class="lineno"> 75</span> assert(fenwick_tree.sum_range(0, 1) == 3);</div>
<div class="line"><span class="lineno"> 76</span> assert(fenwick_tree.sum_range(0, 2) == 6);</div>
<div class="line"><span class="lineno"> 77</span> fenwick_tree.update(0, 6);</div>
<div class="line"><span class="lineno"> 78</span> assert(fenwick_tree.sum_range(0, 0) == 6);</div>
<div class="line"><span class="lineno"> 79</span> assert(fenwick_tree.sum_range(0, 1) == 8);</div>
<div class="line"><span class="lineno"> 80</span> assert(fenwick_tree.sum_range(0, 2) == 11);</div>
<div class="line"><span class="lineno"> 81</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 82</span>}</div>
<div class="ttc" id="aclass_fenwick_tree_html"><div class="ttname"><a href="../../dd/d91/class_fenwick_tree.html">FenwickTree</a></div><div class="ttdef"><b>Definition</b> fenwick_tree.cpp:17</div></div>
<div class="ttc" id="avector_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a></div></div>
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