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<div class="headertitle"><div class="title">longest_substring_without_repeating_characters.cpp File Reference</div></div>
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<p><a class="el" href="../../dd/d4f/class_solution.html">Solution</a> for Longest Substring Without Repeating Characters problem.
<a href="#details">More...</a></p>
<div class="textblock"><code>#include &lt;iostream&gt;</code><br />
<code>#include &lt;unordered_map&gt;</code><br />
<code>#include &lt;deque&gt;</code><br />
<code>#include &lt;string&gt;</code><br />
<code>#include &lt;cassert&gt;</code><br />
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Include dependency graph for longest_substring_without_repeating_characters.cpp:</div>
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<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="../../da/d21/class_longest___substring.html">Longest_Substring</a></td></tr>
<tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Class that solves the Longest Substring Without Repeating Characters problem. <a href="../../da/d21/class_longest___substring.html#details">More...</a><br /></td></tr>
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<tr class="memdesc:a483bb8ccf42aaf7375a83e91490eda1e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Self-test implementations. <br /></td></tr>
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<tr class="memitem:ae66f6b31b5ad750f1fe042a706a4e3d4" id="r_ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="#ae66f6b31b5ad750f1fe042a706a4e3d4">main</a> ()</td></tr>
<tr class="memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4"><td class="mdescLeft">&#160;</td><td class="mdescRight">Main function. <br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p><a class="el" href="../../dd/d4f/class_solution.html">Solution</a> for Longest Substring Without Repeating Characters problem. </p>
<p>Problem link: <a href="https://leetcode.com/problems/longest-substring-without-repeating-characters/description/">https://leetcode.com/problems/longest-substring-without-repeating-characters/description/</a></p>
<p>Intuition: 1) The intuition is straightforward and simple. We track the frequency of characters. 2) Since we can't use a string to track the longest substring without repeating characters efficiently (as removing a character from the front of a string isn't O(1)), we optimize the solution using a deque approach.</p>
<p>Approach: 1) Initialize an unordered_map to track the frequency of characters. 2) Use a deque for pushing characters, and update the result deque (<code>res</code>) with the current deque (<code>temp</code>) whenever we find a longer substring. 3) Use a while loop to reduce the frequency from the front, incrementing <code>i</code>, and removing characters from the <code>temp</code> deque as we no longer need them. 4) Return <code>res.size()</code> as we are interested in the length of the longest substring.</p>
<p>Time Complexity: O(N) Space Complexity: O(N)</p>
<p>I hope this helps to understand. Thank you! </p><dl class="section author"><dt>Author</dt><dd><a href="../../github.com/ashish5kmax" target="_blank">Ashish Kumar Sahoo</a> </dd></dl>
<p class="definition">Definition in file <a class="el" href="../../d4/db8/longest__substring__without__repeating__characters_8cpp_source.html">longest_substring_without_repeating_characters.cpp</a>.</p>
</div><h2 class="groupheader">Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ae66f6b31b5ad750f1fe042a706a4e3d4">&#9670;&#160;</a></span>main()</h2>
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<td class="memname">int main </td>
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<p>Main function. </p>
<dl class="section return"><dt>Returns</dt><dd>0 on successful execution. </dd></dl>
<p class="definition">Definition at line <a class="el" href="../../d4/db8/longest__substring__without__repeating__characters_8cpp_source.html#l00107">107</a> of file <a class="el" href="../../d4/db8/longest__substring__without__repeating__characters_8cpp_source.html">longest_substring_without_repeating_characters.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 107</span> {</div>
<div class="line"><span class="lineno"> 108</span> <a class="code hl_function" href="#a483bb8ccf42aaf7375a83e91490eda1e">tests</a>(); <span class="comment">// run self-test implementations</span></div>
<div class="line"><span class="lineno"> 109</span> <span class="keywordflow">return</span> 0;</div>
<div class="line"><span class="lineno"> 110</span>}</div>
<div class="ttc" id="alongest__substring__without__repeating__characters_8cpp_html_a483bb8ccf42aaf7375a83e91490eda1e"><div class="ttname"><a href="#a483bb8ccf42aaf7375a83e91490eda1e">tests</a></div><div class="ttdeci">static void tests()</div><div class="ttdoc">Self-test implementations.</div><div class="ttdef"><b>Definition</b> <a href="../../d4/db8/longest__substring__without__repeating__characters_8cpp_source.html#l00092">longest_substring_without_repeating_characters.cpp:92</a></div></div>
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<h2 class="memtitle"><span class="permalink"><a href="#a483bb8ccf42aaf7375a83e91490eda1e">&#9670;&#160;</a></span>tests()</h2>
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<td class="memname">static void tests </td>
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<p>Self-test implementations. </p>
<dl class="section return"><dt>Returns</dt><dd>void </dd></dl>
<p class="definition">Definition at line <a class="el" href="../../d4/db8/longest__substring__without__repeating__characters_8cpp_source.html#l00092">92</a> of file <a class="el" href="../../d4/db8/longest__substring__without__repeating__characters_8cpp_source.html">longest_substring_without_repeating_characters.cpp</a>.</p>
<div class="fragment"><div class="line"><span class="lineno"> 92</span> {</div>
<div class="line"><span class="lineno"> 93</span> <a class="code hl_class" href="../../da/d21/class_longest___substring.html">Longest_Substring</a> soln;</div>
<div class="line"><span class="lineno"> 94</span> assert(soln.<a class="code hl_function" href="../../da/d21/class_longest___substring.html#af8a3672bc8d95e7da4f9a45e5e2e387d">lengthOfLongestSubstring</a>(<span class="stringliteral">&quot;abcabcbb&quot;</span>) == 3);</div>
<div class="line"><span class="lineno"> 95</span> assert(soln.<a class="code hl_function" href="../../da/d21/class_longest___substring.html#af8a3672bc8d95e7da4f9a45e5e2e387d">lengthOfLongestSubstring</a>(<span class="stringliteral">&quot;bbbbb&quot;</span>) == 1);</div>
<div class="line"><span class="lineno"> 96</span> assert(soln.<a class="code hl_function" href="../../da/d21/class_longest___substring.html#af8a3672bc8d95e7da4f9a45e5e2e387d">lengthOfLongestSubstring</a>(<span class="stringliteral">&quot;pwwkew&quot;</span>) == 3);</div>
<div class="line"><span class="lineno"> 97</span> assert(soln.<a class="code hl_function" href="../../da/d21/class_longest___substring.html#af8a3672bc8d95e7da4f9a45e5e2e387d">lengthOfLongestSubstring</a>(<span class="stringliteral">&quot;&quot;</span>) == 0); <span class="comment">// Test case for empty string</span></div>
<div class="line"><span class="lineno"> 98</span> assert(soln.<a class="code hl_function" href="../../da/d21/class_longest___substring.html#af8a3672bc8d95e7da4f9a45e5e2e387d">lengthOfLongestSubstring</a>(<span class="stringliteral">&quot;abcdef&quot;</span>) == 6); <span class="comment">// Test case for all unique characters</span></div>
<div class="line"><span class="lineno"> 99</span> assert(soln.<a class="code hl_function" href="../../da/d21/class_longest___substring.html#af8a3672bc8d95e7da4f9a45e5e2e387d">lengthOfLongestSubstring</a>(<span class="stringliteral">&quot;a&quot;</span>) == 1); <span class="comment">// Single character</span></div>
<div class="line"><span class="lineno"> 100</span> std::cout &lt;&lt; <span class="stringliteral">&quot;All test cases passed!&quot;</span> &lt;&lt; std::endl;</div>
<div class="line"><span class="lineno"> 101</span>}</div>
<div class="ttc" id="aclass_longest___substring_html"><div class="ttname"><a href="../../da/d21/class_longest___substring.html">Longest_Substring</a></div><div class="ttdoc">Class that solves the Longest Substring Without Repeating Characters problem.</div><div class="ttdef"><b>Definition</b> <a href="../../d4/db8/longest__substring__without__repeating__characters_8cpp_source.html#l00037">longest_substring_without_repeating_characters.cpp:37</a></div></div>
<div class="ttc" id="aclass_longest___substring_html_af8a3672bc8d95e7da4f9a45e5e2e387d"><div class="ttname"><a href="../../da/d21/class_longest___substring.html#af8a3672bc8d95e7da4f9a45e5e2e387d">Longest_Substring::lengthOfLongestSubstring</a></div><div class="ttdeci">int lengthOfLongestSubstring(std::string s)</div><div class="ttdoc">Function to find the length of the longest substring without repeating characters.</div><div class="ttdef"><b>Definition</b> <a href="../../d4/db8/longest__substring__without__repeating__characters_8cpp_source.html#l00044">longest_substring_without_repeating_characters.cpp:44</a></div></div>
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