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<a href="#pub-methods">Public Member Functions</a> |
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<div class="headertitle"><div class="title">Longest_Substring Class Reference</div></div>
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<p>Class that solves the Longest Substring Without Repeating Characters problem.
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<a href="#details">More...</a></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pub-methods" name="pub-methods"></a>
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Public Member Functions</h2></td></tr>
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<tr class="memitem:af8a3672bc8d95e7da4f9a45e5e2e387d" id="r_af8a3672bc8d95e7da4f9a45e5e2e387d"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="#af8a3672bc8d95e7da4f9a45e5e2e387d">lengthOfLongestSubstring</a> (<a class="elRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string.html">std::string</a> s)</td></tr>
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<tr class="memdesc:af8a3672bc8d95e7da4f9a45e5e2e387d"><td class="mdescLeft"> </td><td class="mdescRight">Function to find the length of the longest substring without repeating characters. <br /></td></tr>
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<tr class="separator:af8a3672bc8d95e7da4f9a45e5e2e387d"><td class="memSeparator" colspan="2"> </td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<div class="textblock"><p>Class that solves the Longest Substring Without Repeating Characters problem. </p>
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</div><h2 class="groupheader">Member Function Documentation</h2>
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<a id="af8a3672bc8d95e7da4f9a45e5e2e387d" name="af8a3672bc8d95e7da4f9a45e5e2e387d"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#af8a3672bc8d95e7da4f9a45e5e2e387d">◆ </a></span>lengthOfLongestSubstring()</h2>
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<td class="memname">int Longest_Substring::lengthOfLongestSubstring </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/string/basic_string.html">std::string</a></td> <td class="paramname"><span class="paramname"><em>s</em></span></td><td>)</td>
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<p>Function to find the length of the longest substring without repeating characters. </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">s</td><td>Input string. </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>Length of the longest substring. </dd></dl>
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<div class="fragment"><div class="line"><span class="lineno"> 44</span> {</div>
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<div class="line"><span class="lineno"> 45</span> <span class="comment">// If the size of string is 1, then it will be the answer.</span></div>
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<div class="line"><span class="lineno"> 46</span> <span class="keywordflow">if</span> (s.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">size</a>() == 1) <span class="keywordflow">return</span> 1;</div>
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<div class="line"><span class="lineno"> 47</span> </div>
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<div class="line"><span class="lineno"> 48</span> <span class="comment">// Map used to store the character frequency.</span></div>
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<div class="line"><span class="lineno"> 49</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/unordered_map.html">std::unordered_map<char, int></a> m;</div>
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<div class="line"><span class="lineno"> 50</span> <span class="keywordtype">int</span> n = s.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">length</a>();</div>
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<div class="line"><span class="lineno"> 51</span> </div>
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<div class="line"><span class="lineno"> 52</span> <span class="comment">// Deque to remove from back if repeating characters are present.</span></div>
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<div class="line"><span class="lineno"> 53</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/deque.html">std::deque<char></a> temp;</div>
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<div class="line"><span class="lineno"> 54</span> <a class="code hl_classRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/deque.html">std::deque<char></a> res;</div>
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<div class="line"><span class="lineno"> 55</span> <span class="keywordtype">int</span> i, j;</div>
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<div class="line"><span class="lineno"> 56</span> </div>
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<div class="line"><span class="lineno"> 57</span> <span class="comment">// Sliding window approach using two pointers.</span></div>
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<div class="line"><span class="lineno"> 58</span> <span class="keywordflow">for</span> (i = 0, j = 0; i < n && j < n;) {</div>
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<div class="line"><span class="lineno"> 59</span> m[s[j]]++;</div>
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<div class="line"><span class="lineno"> 60</span> </div>
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<div class="line"><span class="lineno"> 61</span> <span class="comment">// If repeating character found, update result and remove from the front.</span></div>
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<div class="line"><span class="lineno"> 62</span> <span class="keywordflow">if</span> (m[s[j]] > 1) {</div>
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<div class="line"><span class="lineno"> 63</span> <span class="keywordflow">if</span> (temp.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/deque/size.html">size</a>() > res.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/deque/size.html">size</a>()) {</div>
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<div class="line"><span class="lineno"> 64</span> res = temp;</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> </div>
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<div class="line"><span class="lineno"> 67</span> <span class="keywordflow">while</span> (m[s[j]] > 1) {</div>
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<div class="line"><span class="lineno"> 68</span> temp.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/deque/pop_front.html">pop_front</a>();</div>
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<div class="line"><span class="lineno"> 69</span> m[s[i]]--;</div>
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<div class="line"><span class="lineno"> 70</span> i++;</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> }</div>
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<div class="line"><span class="lineno"> 73</span> </div>
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<div class="line"><span class="lineno"> 74</span> <span class="comment">// Add the current character to the deque.</span></div>
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<div class="line"><span class="lineno"> 75</span> temp.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/deque/push_back.html">push_back</a>(s[j]);</div>
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<div class="line"><span class="lineno"> 76</span> j++;</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="comment">// Final check to update result.</span></div>
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<div class="line"><span class="lineno"> 80</span> <span class="keywordflow">if</span> (temp.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/deque/size.html">size</a>() > res.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/deque/size.html">size</a>()) {</div>
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<div class="line"><span class="lineno"> 81</span> res = temp;</div>
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<div class="line"><span class="lineno"> 82</span> }</div>
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<div class="line"><span class="lineno"> 83</span> </div>
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<div class="line"><span class="lineno"> 84</span> <span class="keywordflow">return</span> res.<a class="code hl_functionRef" target="_blank" href="http://en.cppreference.com/w/cpp/container/deque/size.html">size</a>(); <span class="comment">// Return the length of the longest substring.</span></div>
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<div class="line"><span class="lineno"> 85</span> }</div>
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<div class="ttc" id="adeque_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/deque.html">std::deque</a></div></div>
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<div class="ttc" id="apop_front_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/deque/pop_front.html">std::deque::pop_front</a></div><div class="ttdeci">T pop_front(T... args)</div></div>
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<div class="ttc" id="apush_back_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/deque/push_back.html">std::deque::push_back</a></div><div class="ttdeci">T push_back(T... args)</div></div>
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<div class="ttc" id="asize_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/string/basic_string/size.html">std::string::size</a></div><div class="ttdeci">T size(T... args)</div></div>
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<div class="ttc" id="aunordered_map_html"><div class="ttname"><a href="http://en.cppreference.com/w/cpp/container/unordered_map.html">std::unordered_map</a></div></div>
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<hr/>The documentation for this class was generated from the following file:<ul>
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<li>others/<a class="el" href="../../d4/db8/longest__substring__without__repeating__characters_8cpp.html">longest_substring_without_repeating_characters.cpp</a></li>
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