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<a href="#func-members">Functions</a> </div>
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<div class="title">coin_change_topdown.cpp File Reference</div> </div>
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<div class="contents">
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<p><a href="https://leetcode.com/problems/coin-change/">Minimum coins</a> change problem is a problem used to find the minimum number of coins required to completely reach a target amount.
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<a href="#details">More...</a></p>
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<div class="textblock"><code>#include <iostream></code><br />
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<code>#include <vector></code><br />
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<code>#include <cassert></code><br />
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<code>#include <climits></code><br />
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Namespaces</h2></td></tr>
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<tr class="memitem:dd/d24/namespacedynamic__programming"><td class="memItemLeft" align="right" valign="top">  </td><td class="memItemRight" valign="bottom"><a class="el" href="../../dd/d24/namespacedynamic__programming.html">dynamic_programming</a></td></tr>
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<tr class="memdesc:dd/d24/namespacedynamic__programming"><td class="mdescLeft"> </td><td class="mdescRight">Dynamic Programming algorithms. <br /></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:d5/db8/namespacemincoins__topdown"><td class="memItemLeft" align="right" valign="top">  </td><td class="memItemRight" valign="bottom"><a class="el" href="../../d5/db8/namespacemincoins__topdown.html">mincoins_topdown</a></td></tr>
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<tr class="memdesc:d5/db8/namespacemincoins__topdown"><td class="mdescLeft"> </td><td class="mdescRight">Functions for <a href="https://leetcode.com/problems/coin-change/">minimum coin exchange</a> problem. <br /></td></tr>
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<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:ac816a4ae8a29c156b90377041000929a"><td class="memTemplParams" colspan="2">template<typename T > </td></tr>
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<tr class="memitem:ac816a4ae8a29c156b90377041000929a"><td class="memTemplItemLeft" align="right" valign="top">int64_t </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="../../d9/d31/coin__change__topdown_8cpp.html#ac816a4ae8a29c156b90377041000929a">dynamic_programming::mincoins_topdown::mincoins</a> (const T &n, const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>< T > &coins, const int16_t &t, <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>< T > dp)</td></tr>
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<tr class="memdesc:ac816a4ae8a29c156b90377041000929a"><td class="mdescLeft"> </td><td class="mdescRight">This implementation is for finding minimum number of coins . <a href="../../d9/d31/coin__change__topdown_8cpp.html#ac816a4ae8a29c156b90377041000929a">More...</a><br /></td></tr>
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<tr class="separator:ac816a4ae8a29c156b90377041000929a"><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="../../d9/d31/coin__change__topdown_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a> ()</td></tr>
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<tr class="memdesc:aa8dca7b867074164d5f45b0f3851269d"><td class="mdescLeft"> </td><td class="mdescRight">Test implementations. <a href="../../d9/d31/coin__change__topdown_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="../../d9/d31/coin__change__topdown_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="../../d9/d31/coin__change__topdown_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>
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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://leetcode.com/problems/coin-change/">Minimum coins</a> change problem is a problem used to find the minimum number of coins required to completely reach a target amount. </p>
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<p>This problem can be solved using 2 methods:</p><ol type="1">
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<li>Top down approach</li>
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<li>Bottom up appraoch Top down approach involves a vector with all elements initialised to 0. It is based on optimal substructure and overlapping subproblems. Overall time complexity of coin change problem is O(n*t) For example: example 1:- Coins: {1,7,10} Target:15 Therfore minimum number of coins required = 3 of denomination 1,7 and 7. <dl class="section author"><dt>Author</dt><dd><a href="https://github.com/webdesignbydivyansh">Divyansh Kushwaha</a> </dd></dl>
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</li>
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</ol>
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</div><h2 class="groupheader">Function Documentation</h2>
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<a id="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="memitem">
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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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<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 name="l00086"></a><span class="lineno"> 86</span>  {</div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <a class="code" href="../../d9/d31/coin__change__topdown_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a>(); <span class="comment">// execute the test</span></div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</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="../../d9/d31/coin__change__topdown_8cpp_ae66f6b31b5ad750f1fe042a706a4e3d4_cgraph.svg" width="324" height="139"><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="ac816a4ae8a29c156b90377041000929a"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ac816a4ae8a29c156b90377041000929a">◆ </a></span>mincoins()</h2>
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template<typename T > </div>
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<tr>
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<td class="memname">int64_t dynamic_programming::mincoins_topdown::mincoins </td>
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<td>(</td>
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<td class="paramtype">const T & </td>
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<td class="paramname"><em>n</em>, </td>
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<td class="paramtype">const <a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector</a>< T > & </td>
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<td class="paramname"><em>coins</em>, </td>
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<td class="paramtype">const int16_t & </td>
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<td class="paramname"><em>dp</em> </td>
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<p>This implementation is for finding minimum number of coins . </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">T</td><td>template-type to use any kind of value </td></tr>
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<tr><td class="paramname">n</td><td>amount to be reached </td></tr>
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<tr><td class="paramname">coins</td><td>vector of coins </td></tr>
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<tr><td class="paramname">t</td><td>deontes the number of coins </td></tr>
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<tr><td class="paramname">dp</td><td>initilised to 0 </td></tr>
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<dl class="section return"><dt>Returns</dt><dd>minimum number of coins </dd></dl>
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<div class="fragment"><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  {</div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  <span class="keywordflow">if</span>(n==0){</div>
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<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  }</div>
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<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">if</span>(dp[n]!=0){</div>
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<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  <span class="keywordflow">return</span> dp[n];</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  }</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordtype">int</span> <a class="code" href="../../d7/d35/matrix__exponentiation_8cpp.html#ad8389ed58fd0ec66df248014775ad1fa">ans</a>=INT_MAX; <span class="comment">//variable to store min coins</span></div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i=0;i<t;i++){</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  <span class="keywordflow">if</span>(n-coins[i]>=0){ <span class="comment">//if after subtracting the current denomination is it greater than 0 or not</span></div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  <span class="keywordtype">int</span> sub=<a class="code" href="../../d9/d31/coin__change__topdown_8cpp.html#ac816a4ae8a29c156b90377041000929a">mincoins</a>(n-coins[i],coins,t,dp);</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <a class="code" href="../../d7/d35/matrix__exponentiation_8cpp.html#ad8389ed58fd0ec66df248014775ad1fa">ans</a>=<a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/algorithm/min.html">std::min</a>(<a class="code" href="../../d7/d35/matrix__exponentiation_8cpp.html#ad8389ed58fd0ec66df248014775ad1fa">ans</a>,sub+1);</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  }</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  }</div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  dp[n]=<a class="code" href="../../d7/d35/matrix__exponentiation_8cpp.html#ad8389ed58fd0ec66df248014775ad1fa">ans</a>;</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <span class="keywordflow">return</span> dp[n]; <span class="comment">//returns minimum number of coins</span></div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  }</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>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 name="l00070"></a><span class="lineno"> 70</span>  {</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="comment">// example 1: number of coins=3 and minimum coins required=3(7,7,1)</span></div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keyword">const</span> int64_t n1 = 15;</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keyword">const</span> int8_t t1=3, a1=0;</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"\nTest 1..."</span>;</div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<int64_t></a> arr1 {1,7,10};</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/vector.html">std::vector<int64_t></a> dp1 (n1+1);</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <a class="code" href="../../de/d85/decimal__to__roman__numeral_8cpp.html#a88203bd297e8405160c132faa1187780">fill</a>(dp1.begin(),dp1.end(),a1);</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  assert(dynamic_programming::mincoins_topdown::mincoins(n1, arr1, t1, dp1)==3);</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <a class="codeRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <span class="stringliteral">"Passed\n"</span>;</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> }</div>
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<div class="ttc" id="acoin__change__topdown_8cpp_html_aa8dca7b867074164d5f45b0f3851269d"><div class="ttname"><a href="../../d9/d31/coin__change__topdown_8cpp.html#aa8dca7b867074164d5f45b0f3851269d">test</a></div><div class="ttdeci">static void test()</div><div class="ttdoc">Test implementations.</div><div class="ttdef"><b>Definition:</b> coin_change_topdown.cpp:70</div></div>
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<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 class="ttdoc">STL class.</div></div>
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<div class="ttc" id="adecimal__to__roman__numeral_8cpp_html_a88203bd297e8405160c132faa1187780"><div class="ttname"><a href="../../de/d85/decimal__to__roman__numeral_8cpp.html#a88203bd297e8405160c132faa1187780">fill</a></div><div class="ttdeci">std::string fill(char c, int n)</div><div class="ttdef"><b>Definition:</b> decimal_to_roman_numeral.cpp:15</div></div>
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<div class="ttc" id="acoin__change__topdown_8cpp_html_ac816a4ae8a29c156b90377041000929a"><div class="ttname"><a href="../../d9/d31/coin__change__topdown_8cpp.html#ac816a4ae8a29c156b90377041000929a">dynamic_programming::mincoins_topdown::mincoins</a></div><div class="ttdeci">int64_t mincoins(const T &n, const std::vector< T > &coins, const int16_t &t, std::vector< T > dp)</div><div class="ttdoc">This implementation is for finding minimum number of coins .</div><div class="ttdef"><b>Definition:</b> coin_change_topdown.cpp:45</div></div>
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