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<div class="headertitle"><div class="title">kadanes3.cpp</div></div>
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<a href="../../de/dcd/kadanes3_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span> </div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="preprocessor">#include &lt;array&gt;</span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="preprocessor">#include &lt;cassert&gt;</span> </div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="preprocessor">#include &lt;climits&gt;</span> </div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#include &lt;cstdint&gt;</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="preprocessor">#include &lt;iostream&gt;</span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="keyword">template</span> &lt;std::<span class="keywordtype">size_t</span> SIZE&gt;</div>
<div class="foldopen" id="foldopen00029" data-start="{" data-end="}">
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"><a class="line" href="../../de/dcd/kadanes3_8cpp.html#a338439a04148ae89f695595acfa5c147"> 29</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../de/dcd/kadanes3_8cpp.html#a338439a04148ae89f695595acfa5c147">max_subarray_sum</a>(std::array&lt;int64_t, SIZE&gt; arr, uint64_t length) {</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> int64_t current_max = INT_MIN, current_sum = 0;</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; length; i++) {</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> current_sum = current_sum + arr[i];</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="keywordflow">if</span> (current_max &lt; current_sum) {</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> current_max = current_sum;</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> }</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> </div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keywordflow">if</span> (current_sum &lt; 0) {</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> current_sum = 0;</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> }</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> }</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <span class="keywordflow">return</span> current_max;</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span>}</div>
</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span></div>
<div class="foldopen" id="foldopen00048" data-start="{" data-end="}">
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"><a class="line" href="../../de/dcd/kadanes3_8cpp.html#aa8dca7b867074164d5f45b0f3851269d"> 48</a></span><span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../de/dcd/kadanes3_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>() {</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> std::array&lt;int64_t, 4&gt; arr = {1, 2, 3, 4};</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> std::array&lt;int64_t, 5&gt; arr1 = {-1, -2, -4, -6, 7};</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> assert(<a class="code hl_function" href="../../de/dcd/kadanes3_8cpp.html#a338439a04148ae89f695595acfa5c147">max_subarray_sum</a>(arr, 4) == 10);</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> assert(<a class="code hl_function" href="../../de/dcd/kadanes3_8cpp.html#a338439a04148ae89f695595acfa5c147">max_subarray_sum</a>(arr1, 5) == 7);</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> std::cout &lt;&lt; <span class="stringliteral">&quot;All test cases have passed!\n&quot;</span>;</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span>}</div>
</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span></div>
<div class="foldopen" id="foldopen00060" data-start="{" data-end="}">
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"><a class="line" href="../../de/dcd/kadanes3_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 60</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../de/dcd/kadanes3_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> <span class="comment">// Below is the code for accepting array from the user and then</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> <span class="comment">// calling the function for the required output.</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="comment">// It has been commented for now so that the test() function can run</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <span class="comment">// and the test cases can be verified.</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// code for accepting array from user starts</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> </div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="comment">// std::size_t n; // variable for length of input array</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="comment">// std::cout &lt;&lt; &quot;Enter length of the array: &quot;;</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="comment">// std::cin &gt;&gt; n;</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="comment">// std::array&lt;int64_t, 100&gt; arr = {0};</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="comment">// // we need to give a constant in size. Hence we have allocated 100</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="comment">// for now.</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// for (int i = 0; i &lt; n; i++)</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> <span class="comment">// taking input of each element of the array</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="comment">// {</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="comment">// std::cin &gt;&gt; arr[i];</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// }</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="comment">// code for accepting array from user ends</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> </div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="comment">// int max_sum = max_subarray_sum(arr, n);</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="comment">// std::cout &lt;&lt; &quot;Maximum contiguous sum for this array is : &quot; &lt;&lt; max_sum</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="comment">// &lt;&lt; std::endl;</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> </div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> <a class="code hl_function" href="../../de/dcd/kadanes3_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// run self-test implementations</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span>}</div>
</div>
<div class="ttc" id="akadanes3_8cpp_html_a338439a04148ae89f695595acfa5c147"><div class="ttname"><a href="../../de/dcd/kadanes3_8cpp.html#a338439a04148ae89f695595acfa5c147">max_subarray_sum</a></div><div class="ttdeci">int max_subarray_sum(std::array&lt; int64_t, SIZE &gt; arr, uint64_t length)</div><div class="ttdoc">for IO operations</div><div class="ttdef"><b>Definition</b> <a href="#l00029">kadanes3.cpp:29</a></div></div>
<div class="ttc" id="akadanes3_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../de/dcd/kadanes3_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> <a href="#l00048">kadanes3.cpp:48</a></div></div>
<div class="ttc" id="akadanes3_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../de/dcd/kadanes3_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdoc">Main function.</div><div class="ttdef"><b>Definition</b> <a href="#l00060">kadanes3.cpp:60</a></div></div>
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