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<div class="headertitle"><div class="title">prefix_sum_array.cpp File Reference</div></div>
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<p><a href="https://en.wikipedia.org/wiki/Prefix_sum" target="_blank">Prefix Sum Array</a> data structure implementation.
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<a href="#details">More...</a></p>
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<div class="textblock"><code>#include <cassert></code><br />
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<code>#include <iostream></code><br />
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<code>#include <vector></code><br />
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</div><div class="textblock"><div class="dynheader">
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Include dependency graph for prefix_sum_array.cpp:</div>
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Namespaces</h2></td></tr>
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<tr class="memitem:dd/d69/namespacerange__queries"><td class="memItemLeft" align="right" valign="top">namespace  </td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d69/namespacerange__queries.html">range_queries</a></td></tr>
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<tr class="memdesc:dd/d69/namespacerange__queries"><td class="mdescLeft"> </td><td class="mdescRight">Algorithms and Data Structures that support range queries and updates. <br /></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:d7/d88/namespaceprefix__sum__array"><td class="memItemLeft" align="right" valign="top">namespace  </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d88/namespaceprefix__sum__array.html">prefix_sum_array</a></td></tr>
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<tr class="memdesc:d7/d88/namespaceprefix__sum__array"><td class="mdescLeft"> </td><td class="mdescRight">Range sum queries using prefix-sum-array. <br /></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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Functions</h2></td></tr>
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<tr class="memitem:ab36151479ad37d53ef9fcb60a274b1d9"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d1/d9e/prefix__sum__array_8cpp.html#ab36151479ad37d53ef9fcb60a274b1d9">range_queries::prefix_sum_array::build</a> (<a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>< int64_t > original_array)</td></tr>
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||||
<tr class="memdesc:ab36151479ad37d53ef9fcb60a274b1d9"><td class="mdescLeft"> </td><td class="mdescRight">function that builds the PSA <a href="../../d1/d9e/prefix__sum__array_8cpp.html#ab36151479ad37d53ef9fcb60a274b1d9">More...</a><br /></td></tr>
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<tr class="separator:ab36151479ad37d53ef9fcb60a274b1d9"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:a7c8fd967c36dbba5fdf9c71faed604cf"><td class="memItemLeft" align="right" valign="top">int64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d1/d9e/prefix__sum__array_8cpp.html#a7c8fd967c36dbba5fdf9c71faed604cf">range_queries::prefix_sum_array::query</a> (int64_t beg, int64_t end)</td></tr>
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<tr class="memdesc:a7c8fd967c36dbba5fdf9c71faed604cf"><td class="mdescLeft"> </td><td class="mdescRight">query function <a href="../../d1/d9e/prefix__sum__array_8cpp.html#a7c8fd967c36dbba5fdf9c71faed604cf">More...</a><br /></td></tr>
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<tr class="separator:a7c8fd967c36dbba5fdf9c71faed604cf"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:aa8dca7b867074164d5f45b0f3851269d"><td class="memItemLeft" align="right" valign="top">static void </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d1/d9e/prefix__sum__array_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a> ()</td></tr>
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||||
<tr class="memdesc:aa8dca7b867074164d5f45b0f3851269d"><td class="mdescLeft"> </td><td class="mdescRight">Self-test implementations. <a href="../../d1/d9e/prefix__sum__array_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">More...</a><br /></td></tr>
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<tr class="separator:aa8dca7b867074164d5f45b0f3851269d"><td class="memSeparator" colspan="2"> </td></tr>
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||||
<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d1/d9e/prefix__sum__array_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
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||||
<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft"> </td><td class="mdescRight">Main function. <a href="../../d1/d9e/prefix__sum__array_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">More...</a><br /></td></tr>
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<tr class="separator:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memSeparator" colspan="2"> </td></tr>
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</table><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="var-members" name="var-members"></a>
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Variables</h2></td></tr>
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<tr class="memitem:aed6103aaebcbf1a8978d1e038d22e001"><td class="memItemLeft" align="right" valign="top"><a id="aed6103aaebcbf1a8978d1e038d22e001" name="aed6103aaebcbf1a8978d1e038d22e001"></a>
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||||
<a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>< int64_t > </td><td class="memItemRight" valign="bottom"><b>range_queries::prefix_sum_array::PSA</b> (1, 0)</td></tr>
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<tr class="separator:aed6103aaebcbf1a8978d1e038d22e001"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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||||
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p ><a href="https://en.wikipedia.org/wiki/Prefix_sum" target="_blank">Prefix Sum Array</a> data structure implementation. </p>
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<p >Prefix Sum Array is a data structure, that allows answering sum in some range queries. It can answer most sum range queries in O(1), with a build time complexity of O(N). But it hasn't an update querie.</p>
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<ul>
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<li>Running Time Complexity <br />
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</li>
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<li>Build : O(N) <br />
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</li>
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<li>Range Query : O(1) <br />
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<dl class="section author"><dt>Author</dt><dd><a href="https://github.com/PauloVLB" target="_blank">Paulo Vitor Lima Borges</a> </dd></dl>
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</li>
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||||
</ul>
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||||
</div><h2 class="groupheader">Function Documentation</h2>
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<a id="ab36151479ad37d53ef9fcb60a274b1d9" name="ab36151479ad37d53ef9fcb60a274b1d9"></a>
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||||
<h2 class="memtitle"><span class="permalink"><a href="#ab36151479ad37d53ef9fcb60a274b1d9">◆ </a></span>build()</h2>
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<div class="memproto">
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<tr>
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<td class="memname">void range_queries::prefix_sum_array::build </td>
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<td>(</td>
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||||
<td class="paramtype"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>< int64_t > </td>
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<td class="paramname"><em>original_array</em></td><td>)</td>
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<td></td>
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</tr>
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</div><div class="memdoc">
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<p>function that builds the PSA </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">original_array</td><td>original array of values </td></tr>
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</table>
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</dd>
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||||
</dl>
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<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
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<div class="fragment"><div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> {</div>
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||||
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 1; i <= static_cast<int>(original_array.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/size.html">size</a>()); i++) {</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> PSA.push_back(PSA[i - 1] + original_array[i]);</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> }</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span>}</div>
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||||
<div class="ttc" id="asize_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/vector/size.html">std::vector::size</a></div><div class="ttdeci">T size(T... args)</div></div>
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||||
</div><!-- fragment --><div class="dynheader">
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||||
Here is the call graph for this function:</div>
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||||
<div class="dyncontent">
|
||||
<div class="center"><iframe scrolling="no" frameborder="0" src="../../d1/d9e/prefix__sum__array_8cpp_ab36151479ad37d53ef9fcb60a274b1d9_cgraph.svg" width="320" height="76"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe>
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</div>
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||||
</div>
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</div>
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||||
<a id="ae66f6b31b5ad750f1fe042a706a4e3d4" name="ae66f6b31b5ad750f1fe042a706a4e3d4"></a>
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||||
<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">◆ </a></span>main()</h2>
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<div class="memproto">
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<td class="memname">int main </td>
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<td>(</td>
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<td class="paramtype">void </td>
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<td class="paramname"></td><td>)</td>
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<td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>Main function. </p>
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<dl class="section return"><dt>Returns</dt><dd>0 on exit </dd></dl>
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<div class="fragment"><div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> {</div>
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||||
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <a class="code hl_function" href="../../d1/d9e/prefix__sum__array_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// run self-test implementations</span></div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span>}</div>
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||||
<div class="ttc" id="aprefix__sum__array_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../d1/d9e/prefix__sum__array_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">Self-test implementations.</div><div class="ttdef"><b>Definition:</b> prefix_sum_array.cpp:61</div></div>
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</div><!-- fragment --><div class="dynheader">
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Here is the call graph for this function:</div>
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<div class="dyncontent">
|
||||
<div class="center"><iframe scrolling="no" frameborder="0" src="../../d1/d9e/prefix__sum__array_8cpp_ae66f6b31b5ad750f1fe042a706a4e3d4_cgraph.svg" width="154" height="38"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe>
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</div>
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</div>
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<a id="a7c8fd967c36dbba5fdf9c71faed604cf" name="a7c8fd967c36dbba5fdf9c71faed604cf"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a7c8fd967c36dbba5fdf9c71faed604cf">◆ </a></span>query()</h2>
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<div class="memitem">
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<div class="memproto">
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<table class="memname">
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<tr>
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<td class="memname">int64_t range_queries::prefix_sum_array::query </td>
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<td>(</td>
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<td class="paramtype">int64_t </td>
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<td class="paramname"><em>beg</em>, </td>
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</tr>
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<tr>
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<td class="paramkey"></td>
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<td></td>
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<td class="paramtype">int64_t </td>
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<td class="paramname"><em>end</em> </td>
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</tr>
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<tr>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</tr>
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</table>
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</div><div class="memdoc">
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<p>query function </p>
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<dl class="params"><dt>Parameters</dt><dd>
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<table class="params">
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<tr><td class="paramname">beg</td><td>begin of the interval to sum </td></tr>
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<tr><td class="paramname">end</td><td>end of the interval to sum </td></tr>
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</table>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>sum of the range [beg, end] </dd></dl>
|
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<div class="fragment"><div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span>{ <span class="keywordflow">return</span> PSA[<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/iterator/end.html">end</a>] - PSA[beg - 1]; }</div>
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<p>Self-test implementations. </p>
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<div class="fragment"><div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> {</div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<int64_t></a> values{0, 123, 0, 2, -2, 5,</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <a class="code hl_function" href="../../d1/d9e/prefix__sum__array_8cpp.html#ab36151479ad37d53ef9fcb60a274b1d9">range_queries::prefix_sum_array::build</a>(values);</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="comment">// queries are of the type: sum of the range [a, b] = psa[b] - psa[a-1]</span></div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> </div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> assert(range_queries::prefix_sum_array::query(1, 10) ==</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> 173); <span class="comment">// sum of the entire array</span></div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> assert(range_queries::prefix_sum_array::query(4, 6) ==</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> 27); <span class="comment">// the sum of the interval [4, 6]</span></div>
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