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<div class="headertitle"><div class="title">fibonacci_fast.cpp</div></div>
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<a href="../../d4/d32/fibonacci__fast_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>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="preprocessor">#include <cinttypes></span></div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="preprocessor">#include <cstdio></span></div>
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<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="preprocessor">#include <iostream></span></div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span> </div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"><a class="line" href="../../d4/d32/fibonacci__fast_8cpp.html#a392fb874e547e582e9c66a08a1f23326"> 27</a></span><span class="preprocessor">#define MAX 93</span></div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> </div>
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<div class="foldopen" id="foldopen00030" data-start="{" data-end="}">
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<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"><a class="line" href="../../d4/d32/fibonacci__fast_8cpp.html#a5712edca101204eca8accdb1e096707f"> 30</a></span>uint64_t <a class="code hl_function" href="../../d4/d32/fibonacci__fast_8cpp.html#a5712edca101204eca8accdb1e096707f">fib</a>(uint64_t n) {</div>
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<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span> <span class="keyword">static</span> uint64_t f1 = 1,</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> f2 = 1; <span class="comment">// using static keyword will retain the values of</span></div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <span class="comment">// f1 and f2 for the next function call.</span></div>
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<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span> </div>
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<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span> <span class="keywordflow">if</span> (n <= 2)</div>
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<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> <span class="keywordflow">return</span> f2;</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keywordflow">if</span> (n >= 93) {</div>
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<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span> std::cerr</div>
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<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> << <span class="stringliteral">"Cannot compute for n>93 due to limit of 64-bit integers\n"</span>;</div>
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<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <span class="keywordflow">return</span> 0;</div>
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<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> </div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> uint64_t temp = f2; <span class="comment">// we do not need temp to be static</span></div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> f2 += f1;</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> f1 = temp;</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="keywordflow">return</span> f2;</div>
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<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span>}</div>
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</div>
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<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> </div>
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<div class="foldopen" id="foldopen00051" data-start="{" data-end="}">
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<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"><a class="line" href="../../d4/d32/fibonacci__fast_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 51</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../d4/d32/fibonacci__fast_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
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<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> <span class="comment">// Main Function</span></div>
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<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> <span class="keywordflow">for</span> (uint64_t i = 1; i < 93; i++) {</div>
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<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> std::cout << i << <span class="stringliteral">" th fibonacci number is "</span> << <a class="code hl_function" href="../../d4/d32/fibonacci__fast_8cpp.html#a5712edca101204eca8accdb1e096707f">fib</a>(i) << std::endl;</div>
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<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> }</div>
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<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span>}</div>
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</div>
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<div class="ttc" id="afibonacci__fast_8cpp_html_a5712edca101204eca8accdb1e096707f"><div class="ttname"><a href="../../d4/d32/fibonacci__fast_8cpp.html#a5712edca101204eca8accdb1e096707f">fib</a></div><div class="ttdeci">uint64_t fib(uint64_t n)</div><div class="ttdef"><b>Definition</b> <a href="#l00030">fibonacci_fast.cpp:30</a></div></div>
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<div class="ttc" id="afibonacci__fast_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../d4/d32/fibonacci__fast_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdef"><b>Definition</b> <a href="#l00051">fibonacci_fast.cpp:51</a></div></div>
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