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realstealthninja
@@ -114,13 +114,14 @@ $(function(){initNavTree('df/d94/subarray__sum_8cpp.html','../../'); initResizab
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<p><a href="https://en.wikipedia.org/wiki/Subset_sum_problem" target="_blank">Subset-sum</a> (only continuous subsets) problem
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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 <cstdint></code><br />
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<code>#include <iostream></code><br />
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<code>#include <unordered_map></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 subarray_sum.cpp:</div>
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<div class="dyncontent">
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<div class="center"><iframe scrolling="no" frameborder="0" src="../../d1/d90/subarray__sum_8cpp__incl.svg" width="387" height="126"><p><b>This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.</b></p></iframe></div>
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</div>
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</div><table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="namespaces" name="namespaces"></a>
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@@ -166,11 +167,11 @@ Functions</h2></td></tr>
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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"><span class="lineno"> 114</span> {</div>
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<div class="line"><span class="lineno"> 115</span> <a class="code hl_function" href="#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// run self-test implementations</span></div>
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<div class="line"><span class="lineno"> 116</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><span class="lineno"> 117</span>}</div>
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<div class="ttc" id="asubarray__sum_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">Self-test implementations.</div><div class="ttdef"><b>Definition</b> subarray_sum.cpp:67</div></div>
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<div class="fragment"><div class="line"><span class="lineno"> 115</span> {</div>
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<div class="line"><span class="lineno"> 116</span> <a class="code hl_function" href="#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// run self-test implementations</span></div>
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<div class="line"><span class="lineno"> 117</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><span class="lineno"> 118</span>}</div>
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<div class="ttc" id="asubarray__sum_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">Self-test implementations.</div><div class="ttdef"><b>Definition</b> subarray_sum.cpp:68</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">
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@@ -207,28 +208,28 @@ Here is the call graph for this function:</div>
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</dd>
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</dl>
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<dl class="section return"><dt>Returns</dt><dd>count of the number of subsets with required sum </dd></dl>
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<div class="fragment"><div class="line"><span class="lineno"> 38</span> {</div>
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<div class="line"><span class="lineno"> 39</span> int64_t nelement = in_arr.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/size.html">size</a>();</div>
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<div class="line"><span class="lineno"> 40</span> int64_t count_of_subset = 0;</div>
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<div class="line"><span class="lineno"> 41</span> int64_t current_sum = 0;</div>
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<div class="line"><span class="lineno"> 42</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map.html">std::unordered_map<int64_t, int64_t></a></div>
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<div class="line"><span class="lineno"> 43</span> sumarray; <span class="comment">// to store the subarrays count</span></div>
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<div class="line"><span class="lineno"> 44</span> <span class="comment">// frequency having some sum value</span></div>
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<div class="line"><span class="lineno"> 45</span> </div>
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<div class="line"><span class="lineno"> 46</span> <span class="keywordflow">for</span> (int64_t i = 0; i < nelement; i++) {</div>
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<div class="line"><span class="lineno"> 47</span> current_sum += in_arr[i];</div>
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<div class="line"><span class="lineno"> 48</span> </div>
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<div class="line"><span class="lineno"> 49</span> <span class="keywordflow">if</span> (current_sum == sum) {</div>
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<div class="line"><span class="lineno"> 50</span> count_of_subset++;</div>
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<div class="line"><span class="lineno"> 51</span> }</div>
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<div class="line"><span class="lineno"> 52</span> <span class="comment">// If in case current_sum is greater than the required sum</span></div>
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<div class="line"><span class="lineno"> 53</span> <span class="keywordflow">if</span> (sumarray.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map/find.html">find</a>(current_sum - sum) != sumarray.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map/end.html">end</a>()) {</div>
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<div class="line"><span class="lineno"> 54</span> count_of_subset += (sumarray[current_sum - <a class="code hl_function" href="../../d8/d77/namespacemachine__learning.html#a6f1c98c016ad34ff3d9f39372161bd35">sum</a>]);</div>
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<div class="line"><span class="lineno"> 55</span> }</div>
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<div class="line"><span class="lineno"> 56</span> sumarray[current_sum]++;</div>
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<div class="line"><span class="lineno"> 57</span> }</div>
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<div class="line"><span class="lineno"> 58</span> <span class="keywordflow">return</span> count_of_subset;</div>
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<div class="line"><span class="lineno"> 59</span>}</div>
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<div class="fragment"><div class="line"><span class="lineno"> 39</span> {</div>
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<div class="line"><span class="lineno"> 40</span> int64_t nelement = in_arr.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector/size.html">size</a>();</div>
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<div class="line"><span class="lineno"> 41</span> int64_t count_of_subset = 0;</div>
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<div class="line"><span class="lineno"> 42</span> int64_t current_sum = 0;</div>
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<div class="line"><span class="lineno"> 43</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map.html">std::unordered_map<int64_t, int64_t></a></div>
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<div class="line"><span class="lineno"> 44</span> sumarray; <span class="comment">// to store the subarrays count</span></div>
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<div class="line"><span class="lineno"> 45</span> <span class="comment">// frequency having some sum value</span></div>
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<div class="line"><span class="lineno"> 46</span> </div>
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<div class="line"><span class="lineno"> 47</span> <span class="keywordflow">for</span> (int64_t i = 0; i < nelement; i++) {</div>
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<div class="line"><span class="lineno"> 48</span> current_sum += in_arr[i];</div>
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<div class="line"><span class="lineno"> 49</span> </div>
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<div class="line"><span class="lineno"> 50</span> <span class="keywordflow">if</span> (current_sum == sum) {</div>
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<div class="line"><span class="lineno"> 51</span> count_of_subset++;</div>
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<div class="line"><span class="lineno"> 52</span> }</div>
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<div class="line"><span class="lineno"> 53</span> <span class="comment">// If in case current_sum is greater than the required sum</span></div>
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<div class="line"><span class="lineno"> 54</span> <span class="keywordflow">if</span> (sumarray.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map/find.html">find</a>(current_sum - sum) != sumarray.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map/end.html">end</a>()) {</div>
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<div class="line"><span class="lineno"> 55</span> count_of_subset += (sumarray[current_sum - <a class="code hl_function" href="../../d8/d77/namespacemachine__learning.html#a6f1c98c016ad34ff3d9f39372161bd35">sum</a>]);</div>
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<div class="line"><span class="lineno"> 56</span> }</div>
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<div class="line"><span class="lineno"> 57</span> sumarray[current_sum]++;</div>
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<div class="line"><span class="lineno"> 58</span> }</div>
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<div class="line"><span class="lineno"> 59</span> <span class="keywordflow">return</span> count_of_subset;</div>
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<div class="line"><span class="lineno"> 60</span>}</div>
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<div class="ttc" id="aend_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/unordered_map/end.html">std::unordered_map::end</a></div><div class="ttdeci">T end(T... args)</div></div>
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<div class="ttc" id="afind_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/unordered_map/find.html">std::unordered_map::find</a></div><div class="ttdeci">T find(T... args)</div></div>
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<div class="ttc" id="anamespacemachine__learning_html_a6f1c98c016ad34ff3d9f39372161bd35"><div class="ttname"><a href="../../d8/d77/namespacemachine__learning.html#a6f1c98c016ad34ff3d9f39372161bd35">machine_learning::sum</a></div><div class="ttdeci">T sum(const std::vector< std::valarray< T > > &A)</div><div class="ttdef"><b>Definition</b> vector_ops.hpp:232</div></div>
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@@ -267,48 +268,48 @@ Here is the call graph for this function:</div>
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<p>Self-test implementations. </p>
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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"><span class="lineno"> 67</span> {</div>
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<div class="line"><span class="lineno"> 68</span> <span class="comment">// 1st test</span></div>
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<div class="line"><span class="lineno"> 69</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"1st test "</span>;</div>
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<div class="line"><span class="lineno"> 70</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<int64_t></a> array1 = {-7, -3, -2, 5, 8}; <span class="comment">// input array</span></div>
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<div class="line"><span class="lineno"> 71</span> assert(</div>
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<div class="line"><span class="lineno"> 72</span> backtracking::subarray_sum::subarray_sum(0, array1) ==</div>
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<div class="line"><span class="lineno"> 73</span> 1); <span class="comment">// first argument in subarray_sum function is the required sum and</span></div>
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<div class="line"><span class="lineno"> 74</span> <span class="comment">// second is the input array, answer is the subarray {(-3,-2,5)}</span></div>
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<div class="line"><span class="lineno"> 75</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 76</span> </div>
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<div class="line"><span class="lineno"> 77</span> <span class="comment">// 2nd test</span></div>
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<div class="line"><span class="lineno"> 78</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"2nd test "</span>;</div>
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<div class="line"><span class="lineno"> 79</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<int64_t></a> array2 = {1, 2, 3, 3};</div>
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<div class="line"><span class="lineno"> 80</span> assert(backtracking::subarray_sum::subarray_sum(6, array2) ==</div>
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<div class="line"><span class="lineno"> 81</span> 2); <span class="comment">// here we are expecting 2 subsets which sum up to 6 i.e.</span></div>
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<div class="line"><span class="lineno"> 82</span> <span class="comment">// {(1,2,3),(3,3)}</span></div>
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<div class="line"><span class="lineno"> 83</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 84</span> </div>
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<div class="line"><span class="lineno"> 85</span> <span class="comment">// 3rd test</span></div>
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<div class="line"><span class="lineno"> 86</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"3rd test "</span>;</div>
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<div class="line"><span class="lineno"> 87</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<int64_t></a> array3 = {1, 1, 1, 1};</div>
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<div class="line"><span class="lineno"> 88</span> assert(backtracking::subarray_sum::subarray_sum(1, array3) ==</div>
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<div class="line"><span class="lineno"> 89</span> 4); <span class="comment">// here we are expecting 4 subsets which sum up to 1 i.e.</span></div>
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<div class="line"><span class="lineno"> 90</span> <span class="comment">// {(1),(1),(1),(1)}</span></div>
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<div class="line"><span class="lineno"> 91</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 92</span> </div>
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<div class="line"><span class="lineno"> 93</span> <span class="comment">// 4rd test</span></div>
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<div class="line"><span class="lineno"> 94</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"4th test "</span>;</div>
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<div class="line"><span class="lineno"> 95</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<int64_t></a> array4 = {3, 3, 3, 3};</div>
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<div class="line"><span class="lineno"> 96</span> assert(backtracking::subarray_sum::subarray_sum(6, array4) ==</div>
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<div class="line"><span class="lineno"> 97</span> 3); <span class="comment">// here we are expecting 3 subsets which sum up to 6 i.e.</span></div>
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<div class="line"><span class="lineno"> 98</span> <span class="comment">// {(3,3),(3,3),(3,3)}</span></div>
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<div class="line"><span class="lineno"> 99</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 100</span> </div>
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<div class="line"><span class="lineno"> 101</span> <span class="comment">// 5th test</span></div>
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<div class="line"><span class="lineno"> 102</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"5th test "</span>;</div>
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<div class="line"><span class="lineno"> 103</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<int64_t></a> array5 = {};</div>
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<div class="line"><span class="lineno"> 104</span> assert(backtracking::subarray_sum::subarray_sum(6, array5) ==</div>
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<div class="line"><span class="lineno"> 105</span> 0); <span class="comment">// here we are expecting 0 subsets which sum up to 6 i.e. we</span></div>
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<div class="line"><span class="lineno"> 106</span> <span class="comment">// cannot select anything from an empty array</span></div>
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<div class="line"><span class="lineno"> 107</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 108</span>}</div>
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<div class="fragment"><div class="line"><span class="lineno"> 68</span> {</div>
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<div class="line"><span class="lineno"> 69</span> <span class="comment">// 1st test</span></div>
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<div class="line"><span class="lineno"> 70</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"1st test "</span>;</div>
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<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<int64_t></a> array1 = {-7, -3, -2, 5, 8}; <span class="comment">// input array</span></div>
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<div class="line"><span class="lineno"> 72</span> assert(</div>
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<div class="line"><span class="lineno"> 73</span> backtracking::subarray_sum::subarray_sum(0, array1) ==</div>
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<div class="line"><span class="lineno"> 74</span> 1); <span class="comment">// first argument in subarray_sum function is the required sum and</span></div>
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<div class="line"><span class="lineno"> 75</span> <span class="comment">// second is the input array, answer is the subarray {(-3,-2,5)}</span></div>
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<div class="line"><span class="lineno"> 76</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 77</span> </div>
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<div class="line"><span class="lineno"> 78</span> <span class="comment">// 2nd test</span></div>
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<div class="line"><span class="lineno"> 79</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"2nd test "</span>;</div>
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<div class="line"><span class="lineno"> 80</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<int64_t></a> array2 = {1, 2, 3, 3};</div>
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<div class="line"><span class="lineno"> 81</span> assert(backtracking::subarray_sum::subarray_sum(6, array2) ==</div>
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<div class="line"><span class="lineno"> 82</span> 2); <span class="comment">// here we are expecting 2 subsets which sum up to 6 i.e.</span></div>
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<div class="line"><span class="lineno"> 83</span> <span class="comment">// {(1,2,3),(3,3)}</span></div>
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<div class="line"><span class="lineno"> 84</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 85</span> </div>
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<div class="line"><span class="lineno"> 86</span> <span class="comment">// 3rd test</span></div>
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<div class="line"><span class="lineno"> 87</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"3rd test "</span>;</div>
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<div class="line"><span class="lineno"> 88</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<int64_t></a> array3 = {1, 1, 1, 1};</div>
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<div class="line"><span class="lineno"> 89</span> assert(backtracking::subarray_sum::subarray_sum(1, array3) ==</div>
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<div class="line"><span class="lineno"> 90</span> 4); <span class="comment">// here we are expecting 4 subsets which sum up to 1 i.e.</span></div>
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<div class="line"><span class="lineno"> 91</span> <span class="comment">// {(1),(1),(1),(1)}</span></div>
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<div class="line"><span class="lineno"> 92</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
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<div class="line"><span class="lineno"> 93</span> </div>
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<div class="line"><span class="lineno"> 94</span> <span class="comment">// 4rd test</span></div>
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<div class="line"><span class="lineno"> 95</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"4th test "</span>;</div>
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<div class="line"><span class="lineno"> 96</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<int64_t></a> array4 = {3, 3, 3, 3};</div>
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<div class="line"><span class="lineno"> 97</span> assert(backtracking::subarray_sum::subarray_sum(6, array4) ==</div>
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<div class="line"><span class="lineno"> 98</span> 3); <span class="comment">// here we are expecting 3 subsets which sum up to 6 i.e.</span></div>
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<div class="line"><span class="lineno"> 99</span> <span class="comment">// {(3,3),(3,3),(3,3)}</span></div>
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<div class="line"><span class="lineno"> 100</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
|
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<div class="line"><span class="lineno"> 101</span> </div>
|
||||
<div class="line"><span class="lineno"> 102</span> <span class="comment">// 5th test</span></div>
|
||||
<div class="line"><span class="lineno"> 103</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"5th test "</span>;</div>
|
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<div class="line"><span class="lineno"> 104</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<int64_t></a> array5 = {};</div>
|
||||
<div class="line"><span class="lineno"> 105</span> assert(backtracking::subarray_sum::subarray_sum(6, array5) ==</div>
|
||||
<div class="line"><span class="lineno"> 106</span> 0); <span class="comment">// here we are expecting 0 subsets which sum up to 6 i.e. we</span></div>
|
||||
<div class="line"><span class="lineno"> 107</span> <span class="comment">// cannot select anything from an empty array</span></div>
|
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<div class="line"><span class="lineno"> 108</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"passed"</span> << <a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a>;</div>
|
||||
<div class="line"><span class="lineno"> 109</span>}</div>
|
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<div class="ttc" id="abasic_ostream_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a></div></div>
|
||||
<div class="ttc" id="aendl_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/io/manip/endl.html">std::endl</a></div><div class="ttdeci">T endl(T... args)</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>
|
||||
|
||||
Reference in New Issue
Block a user