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<a href="#func-members">Functions</a> </div>
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<div class="headertitle"><div class="title">count_bits_flip.cpp File Reference</div></div>
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<p>Implementation to <a href="https://www.geeksforgeeks.org/count-number-of-bits-to-be-flipped-to-convert-a-to-b/" target="_blank">Count number of bits to be flipped to convert A to B</a> in an integer.
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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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</div><div class="textblock"><div class="dynheader">
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Include dependency graph for count_bits_flip.cpp:</div>
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Namespaces</h2></td></tr>
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<tr class="memitem:d7/d81/namespacebit__manipulation"><td class="memItemLeft" align="right" valign="top">namespace  </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d81/namespacebit__manipulation.html">bit_manipulation</a></td></tr>
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<tr class="memdesc:d7/d81/namespacebit__manipulation"><td class="mdescLeft"> </td><td class="mdescRight">for IO operations <br /></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:d4/d38/namespacecount__bits__flip"><td class="memItemLeft" align="right" valign="top">namespace  </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d4/d38/namespacecount__bits__flip.html">count_bits_flip</a></td></tr>
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<tr class="memdesc:d4/d38/namespacecount__bits__flip"><td class="mdescLeft"> </td><td class="mdescRight">Functions for the <a href="https://www.geeksforgeeks.org/count-set-bits-in-an-integer/" target="_blank">count bits flip</a> implementation. <br /></td></tr>
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<tr class="separator:"><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="func-members" name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:a2548486b6c3b80101e768562e687ef7b"><td class="memItemLeft" align="right" valign="top"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint64_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d7/d56/count__bits__flip_8cpp.html#a2548486b6c3b80101e768562e687ef7b">bit_manipulation::count_bits_flip::countBitsFlip</a> (<a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/types/integer.html">std::int64_t</a> A, <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/types/integer.html">std::int64_t</a> B)</td></tr>
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<tr class="memdesc:a2548486b6c3b80101e768562e687ef7b"><td class="mdescLeft"> </td><td class="mdescRight">The main function implements count of bits flip required. <a href="../../d7/d56/count__bits__flip_8cpp.html#a2548486b6c3b80101e768562e687ef7b">More...</a><br /></td></tr>
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<tr class="separator:a2548486b6c3b80101e768562e687ef7b"><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="../../d7/d56/count__bits__flip_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="../../d7/d56/count__bits__flip_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="../../d7/d56/count__bits__flip_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="../../d7/d56/count__bits__flip_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">More...</a><br /></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 >Implementation to <a href="https://www.geeksforgeeks.org/count-number-of-bits-to-be-flipped-to-convert-a-to-b/" target="_blank">Count number of bits to be flipped to convert A to B</a> in an integer. </p>
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<p >We are given two numbers A and B. Our task is to count the number of bits needed to be flipped to convert A to B.</p>
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<p >Explanation:</p>
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<p >A = 01010 B = 10100 As we can see, the bits of A that need to be flipped are 01010. If we flipthese bits, we get 10100, which is B.</p>
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<p >Worst Case Time Complexity: O(log n) Space complexity: O(1) </p><dl class="section author"><dt>Author</dt><dd><a href="https://github.com/yashrajyash" target="_blank">Yash Raj Singh</a> </dd></dl>
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</div><h2 class="groupheader">Function Documentation</h2>
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<a id="a2548486b6c3b80101e768562e687ef7b" name="a2548486b6c3b80101e768562e687ef7b"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#a2548486b6c3b80101e768562e687ef7b">◆ </a></span>countBitsFlip()</h2>
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<td class="memname"><a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/types/integer.html">std::uint64_t</a> bit_manipulation::count_bits_flip::countBitsFlip </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/types/integer.html">std::int64_t</a> </td>
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<td class="paramname"><em>A</em>, </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/types/integer.html">std::int64_t</a> </td>
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<td class="paramname"><em>B</em> </td>
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<td></td>
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<td>)</td>
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<td></td><td></td>
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</div><div class="memdoc">
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<p>The main function implements count of bits flip required. </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">A</td><td>is the given number whose bits will be flipped to get number B </td></tr>
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<tr><td class="paramname">B</td><td>is the given target number </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>total number of bits needed to be flipped to convert A to B </dd></dl>
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<div class="fragment"><div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> { <span class="comment">// int64_t is preferred over int so that</span></div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <span class="comment">// no Overflow can be there.</span></div>
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<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> </div>
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<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="keywordtype">int</span> count =</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> 0; <span class="comment">// "count" variable is used to count number of bits flip of the</span></div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> <span class="comment">// number A to form B in binary representation of number 'n'</span></div>
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<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> A = A ^ B;</div>
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="keywordflow">while</span> (A) {</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> A = A & (A - 1);</div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> count++;</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> }</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> <span class="keywordflow">return</span> count;</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span>}</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="center"><iframe scrolling="no" frameborder="0" src="../../d7/d56/count__bits__flip_8cpp_a2548486b6c3b80101e768562e687ef7b_cgraph.svg" width="170" 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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<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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<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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<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="l00085" name="l00085"></a><span class="lineno"> 85</span> {</div>
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<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span> <a class="code hl_function" href="../../d7/d56/count__bits__flip_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// run self-test implementations</span></div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span>}</div>
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<div class="ttc" id="acount__bits__flip_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../d7/d56/count__bits__flip_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> count_bits_flip.cpp:64</div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#aa8dca7b867074164d5f45b0f3851269d">◆ </a></span>test()</h2>
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<td class="memname">static void test </td>
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<td>(</td>
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<span class="mlabels"><span class="mlabel">static</span></span> </td>
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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"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> {</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// A = 10, B = 20 return 4</span></div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(10, 20) == 4);</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="comment">// A = 20, B = 25 return 3</span></div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(20, 25) == 3);</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="comment">// A = 7, B = 10 return 3</span></div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(7, 10) == 3);</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="comment">// A = 17, B = 25 return 1</span></div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(17, 25) == 1);</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> <span class="comment">// A = 11, B = 8 return 2</span></div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(11, 8) == 2);</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="comment">// A = 21, B = 22 return 2</span></div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(21, 22) == 2);</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="comment">// A = 7, B = 786 return 5</span></div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> assert(bit_manipulation::count_bits_flip::countBitsFlip(7, 786) == 5);</div>
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<div class="line"><a id="l00079" name="l00079"></a><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">"All test cases successfully 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"><a id="l00080" name="l00080"></a><span class="lineno"> 80</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>
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<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>
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