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<title>Algorithms_in_C++: backtracking/n_queens_all_solution_optimised.cpp File Reference</title>
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<div id="projectname">Algorithms_in_C++<span id="projectnumber"> 1.0.0</span>
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</div>
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<div id="projectbrief">Set of algorithms implemented in C++.</div>
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</table>
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/* @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt MIT */
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var searchBox = new SearchBox("searchBox", "../../search",'Search','.html');
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@@ -191,27 +191,27 @@ template<size_t n> </div>
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<p >check in the row</p>
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<p >check the first diagonal</p>
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<p >check the second diagonal</p>
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<div class="fragment"><div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> {<span class="comment"></span></div>
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<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span><span class="comment"> /// check in the row</span></div>
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<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span><span class="comment"></span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i <= col; i++) {</div>
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<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> <span class="keywordflow">if</span> (board[row][i] == 1) {</div>
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> }</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> }<span class="comment"></span></div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span><span class="comment"> /// check the first diagonal</span></div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span><span class="comment"></span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = row, j = col; i >= 0 && j >= 0; i--, j--) {</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="keywordflow">if</span> (board[i][j] == 1) {</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> }</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> }<span class="comment"></span></div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span><span class="comment"> /// check the second diagonal</span></div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span><span class="comment"></span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = row, j = col; i <= n - 1 && j >= 0; i++, j--) {</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> <span class="keywordflow">if</span> (board[i][j] == 1) {</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> }</div>
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<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> }</div>
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<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</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="fragment"><div class="line"><span class="lineno"> 60</span> {<span class="comment"></span></div>
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<div class="line"><span class="lineno"> 61</span><span class="comment"> /// check in the row</span></div>
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<div class="line"><span class="lineno"> 62</span><span class="comment"></span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i <= col; i++) {</div>
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<div class="line"><span class="lineno"> 63</span> <span class="keywordflow">if</span> (board[row][i] == 1) {</div>
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<div class="line"><span class="lineno"> 64</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><span class="lineno"> 65</span> }</div>
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<div class="line"><span class="lineno"> 66</span> }<span class="comment"></span></div>
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<div class="line"><span class="lineno"> 67</span><span class="comment"> /// check the first diagonal</span></div>
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<div class="line"><span class="lineno"> 68</span><span class="comment"></span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = row, j = col; i >= 0 && j >= 0; i--, j--) {</div>
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<div class="line"><span class="lineno"> 69</span> <span class="keywordflow">if</span> (board[i][j] == 1) {</div>
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<div class="line"><span class="lineno"> 70</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><span class="lineno"> 71</span> }</div>
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<div class="line"><span class="lineno"> 72</span> }<span class="comment"></span></div>
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<div class="line"><span class="lineno"> 73</span><span class="comment"> /// check the second diagonal</span></div>
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<div class="line"><span class="lineno"> 74</span><span class="comment"></span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = row, j = col; i <= n - 1 && j >= 0; i++, j--) {</div>
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<div class="line"><span class="lineno"> 75</span> <span class="keywordflow">if</span> (board[i][j] == 1) {</div>
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<div class="line"><span class="lineno"> 76</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</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> }</div>
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<div class="line"><span class="lineno"> 79</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><span class="lineno"> 80</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="dyncontent">
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@@ -239,29 +239,29 @@ Here is the call graph for this function:</div>
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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="l00109" name="l00109"></a><span class="lineno"> 109</span> {</div>
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<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> <span class="keyword">const</span> <span class="keywordtype">int</span> n = 4;</div>
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<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/array.html">std::array<std::array<int, n></a>, n> board{};</div>
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<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> </div>
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<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> <span class="keywordflow">if</span> (n % 2 == 0) {</div>
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<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i <= n / 2 - 1; i++) {</div>
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<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> <span class="keywordflow">if</span> (backtracking::n_queens_optimized::CanIMove(board, i, 0)) {</div>
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<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> board[i][0] = 1;</div>
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<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> <a class="code hl_function" href="../../da/dac/n__queens__all__solution__optimised_8cpp.html#a23c0547e4fd1708e6fb643b08327a60f">backtracking::n_queens_optimized::NQueenSol</a>(board, 1);</div>
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<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> board[i][0] = 0;</div>
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<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span> }</div>
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<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span> }</div>
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<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> } <span class="keywordflow">else</span> {</div>
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<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i <= n / 2; i++) {</div>
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<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> <span class="keywordflow">if</span> (backtracking::n_queens_optimized::CanIMove(board, i, 0)) {</div>
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||||
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span> board[i][0] = 1;</div>
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||||
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span> <a class="code hl_function" href="../../da/dac/n__queens__all__solution__optimised_8cpp.html#a23c0547e4fd1708e6fb643b08327a60f">backtracking::n_queens_optimized::NQueenSol</a>(board, 1);</div>
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||||
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span> board[i][0] = 0;</div>
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<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span> }</div>
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||||
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span> }</div>
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<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span> }</div>
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||||
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span> <span class="keywordflow">return</span> 0;</div>
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||||
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span>}</div>
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||||
<div class="fragment"><div class="line"><span class="lineno"> 109</span> {</div>
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||||
<div class="line"><span class="lineno"> 110</span> <span class="keyword">const</span> <span class="keywordtype">int</span> n = 4;</div>
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||||
<div class="line"><span class="lineno"> 111</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/array.html">std::array<std::array<int, n></a>, n> board{};</div>
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<div class="line"><span class="lineno"> 112</span> </div>
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||||
<div class="line"><span class="lineno"> 113</span> <span class="keywordflow">if</span> (n % 2 == 0) {</div>
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<div class="line"><span class="lineno"> 114</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i <= n / 2 - 1; i++) {</div>
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||||
<div class="line"><span class="lineno"> 115</span> <span class="keywordflow">if</span> (backtracking::n_queens_optimized::CanIMove(board, i, 0)) {</div>
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<div class="line"><span class="lineno"> 116</span> board[i][0] = 1;</div>
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||||
<div class="line"><span class="lineno"> 117</span> <a class="code hl_function" href="../../da/dac/n__queens__all__solution__optimised_8cpp.html#a23c0547e4fd1708e6fb643b08327a60f">backtracking::n_queens_optimized::NQueenSol</a>(board, 1);</div>
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<div class="line"><span class="lineno"> 118</span> board[i][0] = 0;</div>
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<div class="line"><span class="lineno"> 119</span> }</div>
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<div class="line"><span class="lineno"> 120</span> }</div>
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<div class="line"><span class="lineno"> 121</span> } <span class="keywordflow">else</span> {</div>
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<div class="line"><span class="lineno"> 122</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i <= n / 2; i++) {</div>
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<div class="line"><span class="lineno"> 123</span> <span class="keywordflow">if</span> (backtracking::n_queens_optimized::CanIMove(board, i, 0)) {</div>
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<div class="line"><span class="lineno"> 124</span> board[i][0] = 1;</div>
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||||
<div class="line"><span class="lineno"> 125</span> <a class="code hl_function" href="../../da/dac/n__queens__all__solution__optimised_8cpp.html#a23c0547e4fd1708e6fb643b08327a60f">backtracking::n_queens_optimized::NQueenSol</a>(board, 1);</div>
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<div class="line"><span class="lineno"> 126</span> board[i][0] = 0;</div>
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<div class="line"><span class="lineno"> 127</span> }</div>
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<div class="line"><span class="lineno"> 128</span> }</div>
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<div class="line"><span class="lineno"> 129</span> }</div>
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<div class="line"><span class="lineno"> 130</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><span class="lineno"> 131</span>}</div>
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<div class="ttc" id="aarray_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/array.html">std::array</a></div></div>
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||||
<div class="ttc" id="an__queens__all__solution__optimised_8cpp_html_a23c0547e4fd1708e6fb643b08327a60f"><div class="ttname"><a href="../../da/dac/n__queens__all__solution__optimised_8cpp.html#a23c0547e4fd1708e6fb643b08327a60f">backtracking::n_queens_optimized::NQueenSol</a></div><div class="ttdeci">void NQueenSol(std::array< std::array< int, n >, n > board, int col)</div><div class="ttdef"><b>Definition:</b> n_queens_all_solution_optimised.cpp:89</div></div>
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</div><!-- fragment -->
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@@ -307,19 +307,19 @@ template<size_t n> </div>
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</table>
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</dd>
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</dl>
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||||
<div class="fragment"><div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> {</div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> <span class="keywordflow">if</span> (col >= n) {</div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> PrintSol<n>(board);</div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> <span class="keywordflow">return</span>;</div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> }</div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < n; i++) {</div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> <span class="keywordflow">if</span> (CanIMove<n>(board, i, col)) {</div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> board[i][col] = 1;</div>
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> NQueenSol<n>(board, col + 1);</div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> board[i][col] = 0;</div>
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<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span> }</div>
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<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span> }</div>
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<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span>}</div>
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<div class="fragment"><div class="line"><span class="lineno"> 89</span> {</div>
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<div class="line"><span class="lineno"> 90</span> <span class="keywordflow">if</span> (col >= n) {</div>
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<div class="line"><span class="lineno"> 91</span> PrintSol<n>(board);</div>
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<div class="line"><span class="lineno"> 92</span> <span class="keywordflow">return</span>;</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="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < n; i++) {</div>
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<div class="line"><span class="lineno"> 95</span> <span class="keywordflow">if</span> (CanIMove<n>(board, i, col)) {</div>
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<div class="line"><span class="lineno"> 96</span> board[i][col] = 1;</div>
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<div class="line"><span class="lineno"> 97</span> NQueenSol<n>(board, col + 1);</div>
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<div class="line"><span class="lineno"> 98</span> board[i][col] = 0;</div>
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<div class="line"><span class="lineno"> 99</span> }</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>}</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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@@ -358,24 +358,24 @@ template<size_t n> </div>
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</table>
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||||
</dd>
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</dl>
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<div class="fragment"><div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> {</div>
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<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 < n; i++) {</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < n; j++) {</div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << board[i][j] << <span class="stringliteral">" "</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> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <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="l00036" name="l00036"></a><span class="lineno"> 36</span> }</div>
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<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <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="l00038" name="l00038"></a><span class="lineno"> 38</span> <span class="keywordflow">if</span> (n % 2 == 0 || (n % 2 == 1 && board[n / 2 + 1][0] != 1)) {</div>
|
||||
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < n; i++) {</div>
|
||||
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < n; j++) {</div>
|
||||
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << board[j][i] << <span class="stringliteral">" "</span>;</div>
|
||||
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> }</div>
|
||||
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <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"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> }</div>
|
||||
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <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"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> }</div>
|
||||
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span>}</div>
|
||||
<div class="fragment"><div class="line"><span class="lineno"> 30</span> {</div>
|
||||
<div class="line"><span class="lineno"> 31</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < n; i++) {</div>
|
||||
<div class="line"><span class="lineno"> 32</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < n; j++) {</div>
|
||||
<div class="line"><span class="lineno"> 33</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << board[i][j] << <span class="stringliteral">" "</span>;</div>
|
||||
<div class="line"><span class="lineno"> 34</span> }</div>
|
||||
<div class="line"><span class="lineno"> 35</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <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"> 36</span> }</div>
|
||||
<div class="line"><span class="lineno"> 37</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <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"> 38</span> <span class="keywordflow">if</span> (n % 2 == 0 || (n % 2 == 1 && board[n / 2 + 1][0] != 1)) {</div>
|
||||
<div class="line"><span class="lineno"> 39</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i < n; i++) {</div>
|
||||
<div class="line"><span class="lineno"> 40</span> <span class="keywordflow">for</span> (<span class="keywordtype">int</span> j = 0; j < n; j++) {</div>
|
||||
<div class="line"><span class="lineno"> 41</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << board[j][i] << <span class="stringliteral">" "</span>;</div>
|
||||
<div class="line"><span class="lineno"> 42</span> }</div>
|
||||
<div class="line"><span class="lineno"> 43</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <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"> 44</span> }</div>
|
||||
<div class="line"><span class="lineno"> 45</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/io/basic_ostream.html">std::cout</a> << <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"> 46</span> }</div>
|
||||
<div class="line"><span class="lineno"> 47</span>}</div>
|
||||
<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><!-- fragment --><div class="dynheader">
|
||||
@@ -393,7 +393,7 @@ Here is the call graph for this function:</div>
|
||||
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