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<div class="headertitle"><div class="title">trie_modern.cpp</div></div>
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<a href="../../dc/d93/trie__modern_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="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="preprocessor">#include <iostream></span> <span class="comment">// for io operations</span></div>
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<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="preprocessor">#include <memory></span> <span class="comment">// for std::shared_ptr<></span></div>
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<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="preprocessor">#include <string></span> <span class="comment">// for std::string class</span></div>
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<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span></div>
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<div class="foldopen" id="foldopen00016" data-start="{" data-end="};">
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<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"><a class="line" href="../../dd/d2f/class_trie.html"> 16</a></span><span class="keyword">class </span><a class="code hl_function" href="../../dd/d2f/class_trie.html#a6af57e9f25d0d0a2d59eea5a4a802908">Trie</a> {</div>
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<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span> <span class="keyword">private</span>:</div>
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<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span> <span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keywordtype">size_t</span> ALPHABETS = 26;</div>
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<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span></div>
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<div class="foldopen" id="foldopen00026" data-start="{" data-end="};">
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"><a class="line" href="../../de/d48/struct_trie_1_1_trie_node.html"> 26</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="../../de/d48/struct_trie_1_1_trie_node.html">TrieNode</a> {</div>
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<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span> <span class="comment">// An array of pointers of size 26 which tells if a character of word is</span></div>
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<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span> <span class="comment">// present or not.</span></div>
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<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span> std::shared_ptr<TrieNode> character[ALPHABETS]{<span class="keyword">nullptr</span>};</div>
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<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="keywordtype">bool</span> isEndOfWord{<span class="keyword">false</span>};</div>
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<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span> };</div>
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</div>
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<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span></div>
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<div class="foldopen" id="foldopen00041" data-start="{" data-end="}">
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<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"><a class="line" href="../../dd/d2f/class_trie.html#a6d10eb1669453395d1900ebd401954fb"> 41</a></span> <span class="keyword">inline</span> <span class="keyword">static</span> <span class="keywordtype">bool</span> <a class="code hl_function" href="../../dd/d2f/class_trie.html#a6d10eb1669453395d1900ebd401954fb">hasChildren</a>(std::shared_ptr<TrieNode> <a class="code hl_class" href="../../d5/da1/structnode.html">node</a>) {</div>
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<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> i = 0; i < ALPHABETS; i++) {</div>
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<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> <span class="keywordflow">if</span> (<a class="code hl_class" href="../../d5/da1/structnode.html">node</a>->character[i]) {</div>
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<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</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="keywordflow">return</span> <span class="keyword">false</span>;</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="foldopen00064" data-start="{" data-end="}">
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<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"><a class="line" href="../../dd/d2f/class_trie.html#a26941759ecf94d67a27d4a610bc0f63d"> 64</a></span> std::shared_ptr<TrieNode> <a class="code hl_function" href="../../dd/d2f/class_trie.html#a26941759ecf94d67a27d4a610bc0f63d">removeWordHelper</a>(<span class="keyword">const</span> std::string& word,</div>
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<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> std::shared_ptr<TrieNode> curr,</div>
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<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keywordtype">size_t</span> index) {</div>
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<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> <span class="keywordflow">if</span> (word.size() == index) {</div>
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<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> <span class="keywordflow">if</span> (curr->isEndOfWord) {</div>
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<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> curr->isEndOfWord = <span class="keyword">false</span>;</div>
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<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> }</div>
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<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> <span class="keywordflow">if</span> (<a class="code hl_function" href="../../dd/d2f/class_trie.html#a6d10eb1669453395d1900ebd401954fb">hasChildren</a>(curr)) {</div>
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<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> <span class="keywordflow">return</span> curr;</div>
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<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> }</div>
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<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</div>
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<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> }</div>
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<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> </div>
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<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> <span class="keywordtype">size_t</span> idx = word[index] - <span class="charliteral">'a'</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="comment">// Throw a runtime error in case the user enters a word which is not</span></div>
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<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <span class="comment">// present in the trie.</span></div>
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<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> <span class="keywordflow">if</span> (!curr->character[idx]) {</div>
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<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span> <span class="keywordflow">throw</span> std::runtime_error(std::move(std::string(<span class="stringliteral">"Word not found."</span>)));</div>
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<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span> }</div>
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<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span> </div>
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<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span> curr->character[idx] =</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="../../dd/d2f/class_trie.html#a26941759ecf94d67a27d4a610bc0f63d">removeWordHelper</a>(word, curr->character[idx], index + 1);</div>
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<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span> </div>
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<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span> <span class="comment">// This if condition checks if the node has some childern.</span></div>
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<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span> <span class="comment">// The 1st if check, i.e. (curr->character[idx]) is checked specifically</span></div>
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<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span> <span class="comment">// because if the older string is a prefix of some other string, then,</span></div>
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<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span> <span class="comment">// there would be no need to check all 26 characters. Example- str1 =</span></div>
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<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span> <span class="comment">// abbey, str2 = abbex and we want to delete string "abbey", then in</span></div>
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<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span> <span class="comment">// this case, there would be no need to check all characters for the</span></div>
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<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span> <span class="comment">// chars a,b,b.</span></div>
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<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span> <span class="keywordflow">if</span> (curr->character[idx] || <a class="code hl_function" href="../../dd/d2f/class_trie.html#a6d10eb1669453395d1900ebd401954fb">hasChildren</a>(curr)) {</div>
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<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span> <span class="keywordflow">return</span> curr;</div>
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<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span> }</div>
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<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span> <span class="keywordflow">return</span> <span class="keyword">nullptr</span>;</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>
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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> <span class="keyword">public</span>:</div>
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<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"><a class="line" href="../../dd/d2f/class_trie.html#a6af57e9f25d0d0a2d59eea5a4a802908"> 103</a></span> <a class="code hl_function" href="../../dd/d2f/class_trie.html#a6af57e9f25d0d0a2d59eea5a4a802908">Trie</a>() : m_root(std::make_shared<<a class="code hl_struct" href="../../de/d48/struct_trie_1_1_trie_node.html">TrieNode</a>>()) {}</div>
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<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span></div>
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<div class="foldopen" id="foldopen00109" data-start="{" data-end="}">
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<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"><a class="line" href="../../dd/d2f/class_trie.html#afd8b79959009b554e98ea7128b2886f2"> 109</a></span> <span class="keywordtype">void</span> <a class="code hl_function" href="../../dd/d2f/class_trie.html#afd8b79959009b554e98ea7128b2886f2">insert</a>(<span class="keyword">const</span> std::string& word) {</div>
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<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span> <span class="keyword">auto</span> curr = m_root;</div>
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<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span> <span class="keywordflow">for</span> (<span class="keywordtype">char</span> ch : word) {</div>
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<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span> <span class="keywordtype">size_t</span> index = ch - <span class="charliteral">'a'</span>;</div>
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<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span> </div>
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<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span> <span class="comment">// if a node for current word is not already present in trie, create</span></div>
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<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span> <span class="comment">// a new node for it.</span></div>
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<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span> <span class="keywordflow">if</span> (!curr->character[index]) {</div>
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<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span> curr->character[index] = std::make_shared<TrieNode>();</div>
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<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span> }</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> curr = curr->character[index];</div>
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<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span> }</div>
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<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span> curr->isEndOfWord = <span class="keyword">true</span>;</div>
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<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span> }</div>
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</div>
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<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span></div>
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<div class="foldopen" id="foldopen00132" data-start="{" data-end="}">
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<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"><a class="line" href="../../dd/d2f/class_trie.html#a411e77126930a0942dd7b65e96b15206"> 132</a></span> <span class="keywordtype">bool</span> <a class="code hl_function" href="../../dd/d2f/class_trie.html#a411e77126930a0942dd7b65e96b15206">search</a>(<span class="keyword">const</span> std::string& word) {</div>
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<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span> <span class="keyword">auto</span> curr = m_root;</div>
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<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span> <span class="keywordflow">for</span> (<span class="keywordtype">char</span> ch : word) {</div>
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<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span> <span class="keywordtype">size_t</span> index = ch - <span class="charliteral">'a'</span>;</div>
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<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span> </div>
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<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span> <span class="comment">// if any node for a character is not found, then return that the</span></div>
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<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span> <span class="comment">// word cannot be formed.</span></div>
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<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span> <span class="keywordflow">if</span> (!curr->character[index]) {</div>
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<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span> }</div>
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<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span> curr = curr->character[index];</div>
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<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span> }</div>
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<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span> <span class="keywordflow">return</span> curr->isEndOfWord;</div>
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<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span> }</div>
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</div>
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<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span> </div>
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<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span> <span class="comment">// Function to remove the word which calls the helper function.</span></div>
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<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span> <span class="keywordtype">void</span> removeWord(<span class="keyword">const</span> std::string& word) {</div>
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<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span> m_root = <a class="code hl_function" href="../../dd/d2f/class_trie.html#a26941759ecf94d67a27d4a610bc0f63d">removeWordHelper</a>(word, m_root, 0);</div>
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<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span> }</div>
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<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span> </div>
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<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span> <span class="keyword">private</span>:</div>
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<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span> <span class="comment">// data member to store the root of the trie.</span></div>
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<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span> std::shared_ptr<TrieNode> m_root;</div>
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<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span>};</div>
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</div>
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<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span></div>
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<div class="foldopen" id="foldopen00160" data-start="{" data-end="}">
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<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"><a class="line" href="../../dc/d93/trie__modern_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4"> 160</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="../../dc/d93/trie__modern_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a>() {</div>
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<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span> <a class="code hl_class" href="../../dd/d2f/class_trie.html">Trie</a> trie;</div>
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<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span> trie.<a class="code hl_function" href="../../dd/d2f/class_trie.html#afd8b79959009b554e98ea7128b2886f2">insert</a>(<span class="stringliteral">"hel"</span>);</div>
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<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span> trie.<a class="code hl_function" href="../../dd/d2f/class_trie.html#afd8b79959009b554e98ea7128b2886f2">insert</a>(<span class="stringliteral">"hello"</span>);</div>
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<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span> trie.removeWord(<span class="stringliteral">"hel"</span>);</div>
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<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span> std::cout << trie.<a class="code hl_function" href="../../dd/d2f/class_trie.html#a411e77126930a0942dd7b65e96b15206">search</a>(<span class="stringliteral">"hello"</span>) << <span class="charliteral">'\n'</span>;</div>
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<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span> </div>
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<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span> <span class="keywordflow">return</span> 0;</div>
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<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span>}</div>
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</div>
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<div class="ttc" id="aclass_trie_html"><div class="ttname"><a href="../../dd/d2f/class_trie.html">Trie</a></div><div class="ttdef"><b>Definition</b> <a href="#l00016">trie_modern.cpp:16</a></div></div>
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<div class="ttc" id="aclass_trie_html_a26941759ecf94d67a27d4a610bc0f63d"><div class="ttname"><a href="../../dd/d2f/class_trie.html#a26941759ecf94d67a27d4a610bc0f63d">Trie::removeWordHelper</a></div><div class="ttdeci">std::shared_ptr< TrieNode > removeWordHelper(const std::string &word, std::shared_ptr< TrieNode > curr, size_t index)</div><div class="ttdef"><b>Definition</b> <a href="#l00064">trie_modern.cpp:64</a></div></div>
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<div class="ttc" id="aclass_trie_html_a411e77126930a0942dd7b65e96b15206"><div class="ttname"><a href="../../dd/d2f/class_trie.html#a411e77126930a0942dd7b65e96b15206">Trie::search</a></div><div class="ttdeci">bool search(const std::string &word)</div><div class="ttdef"><b>Definition</b> <a href="#l00132">trie_modern.cpp:132</a></div></div>
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<div class="ttc" id="aclass_trie_html_a6af57e9f25d0d0a2d59eea5a4a802908"><div class="ttname"><a href="../../dd/d2f/class_trie.html#a6af57e9f25d0d0a2d59eea5a4a802908">Trie::Trie</a></div><div class="ttdeci">Trie()</div><div class="ttdoc">constructor to initialise the root of the trie.</div><div class="ttdef"><b>Definition</b> <a href="#l00103">trie_modern.cpp:103</a></div></div>
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<div class="ttc" id="aclass_trie_html_a6d10eb1669453395d1900ebd401954fb"><div class="ttname"><a href="../../dd/d2f/class_trie.html#a6d10eb1669453395d1900ebd401954fb">Trie::hasChildren</a></div><div class="ttdeci">static bool hasChildren(std::shared_ptr< TrieNode > node)</div><div class="ttdef"><b>Definition</b> <a href="#l00041">trie_modern.cpp:41</a></div></div>
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<div class="ttc" id="aclass_trie_html_afd8b79959009b554e98ea7128b2886f2"><div class="ttname"><a href="../../dd/d2f/class_trie.html#afd8b79959009b554e98ea7128b2886f2">Trie::insert</a></div><div class="ttdeci">void insert(const std::string &word)</div><div class="ttdef"><b>Definition</b> <a href="#l00109">trie_modern.cpp:109</a></div></div>
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<div class="ttc" id="astruct_trie_1_1_trie_node_html"><div class="ttname"><a href="../../de/d48/struct_trie_1_1_trie_node.html">Trie::TrieNode</a></div><div class="ttdef"><b>Definition</b> <a href="#l00026">trie_modern.cpp:26</a></div></div>
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<div class="ttc" id="astructnode_html"><div class="ttname"><a href="../../d5/da1/structnode.html">node</a></div><div class="ttdef"><b>Definition</b> <a href="../../d3/d26/binary__search__tree_8cpp_source.html#l00011">binary_search_tree.cpp:11</a></div></div>
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<div class="ttc" id="atrie__modern_8cpp_html_ae66f6b31b5ad750f1fe042a706a4e3d4"><div class="ttname"><a href="../../dc/d93/trie__modern_8cpp.html#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a></div><div class="ttdeci">int main()</div><div class="ttdef"><b>Definition</b> <a href="#l00160">trie_modern.cpp:160</a></div></div>
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