deploy: 6e8cd0d

Author: yanglbme

en/lc/2278/index.html

@@ -54860,9 +54860,9 @@
       <ul class="md-nav__list">
 
           <li class="md-nav__item">
-  <a href="#solution-1" class="md-nav__link">
+  <a href="#solution-1-counting" class="md-nav__link">
     <span class="md-ellipsis">
-      Solution 1
+      Solution 1: Counting
     </span>
   </a>
 
@@ -77918,7 +77918,9 @@ <h2 id="description">Description</h2>
 <h2 id="solutions">Solutions</h2>
 <!-- solution:start -->
 
-<h3 id="solution-1">Solution 1</h3>
+<h3 id="solution-1-counting">Solution 1: Counting</h3>
+<p>We can traverse the string $\textit{s}$ and count the number of characters that are equal to $\textit{letter}$. Then, we calculate the percentage using the formula $\textit{count} \times 100 \, / \, \textit{len}(\textit{s})$.</p>
+<p>Time complexity is $O(n)$, where $n$ is the length of the string $\textit{s}$. Space complexity is $O(1)$.</p>
 <div class="tabbed-set tabbed-alternate" data-tabs="1:6"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><input id="__tabbed_1_2" name="__tabbed_1" type="radio" /><input id="__tabbed_1_3" name="__tabbed_1" type="radio" /><input id="__tabbed_1_4" name="__tabbed_1" type="radio" /><input id="__tabbed_1_5" name="__tabbed_1" type="radio" /><input id="__tabbed_1_6" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">Python3</label><label for="__tabbed_1_2">Java</label><label for="__tabbed_1_3">C++</label><label for="__tabbed_1_4">Go</label><label for="__tabbed_1_5">TypeScript</label><label for="__tabbed_1_6">Rust</label></div>
 <div class="tabbed-content">
 <div class="tabbed-block">
@@ -77959,76 +77961,42 @@ <h3 id="solution-1">Solution 1</h3>
 <span class="normal">3</span>
 <span class="normal">4</span>
 <span class="normal">5</span>
-<span class="normal">6</span>
-<span class="normal">7</span>
-<span class="normal">8</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="k">class</span><span class="w"> </span><span class="nc">Solution</span><span class="w"> </span><span class="p">{</span>
+<span class="normal">6</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="k">class</span><span class="w"> </span><span class="nc">Solution</span><span class="w"> </span><span class="p">{</span>
 <span class="k">public</span><span class="o">:</span>
 <span class="w">    </span><span class="kt">int</span><span class="w"> </span><span class="n">percentageLetter</span><span class="p">(</span><span class="n">string</span><span class="w"> </span><span class="n">s</span><span class="p">,</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="n">letter</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
-<span class="w">        </span><span class="kt">int</span><span class="w"> </span><span class="n">cnt</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
-<span class="w">        </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kt">char</span><span class="o">&amp;</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="n">s</span><span class="p">)</span><span class="w"> </span><span class="n">cnt</span><span class="w"> </span><span class="o">+=</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">letter</span><span class="p">;</span>
-<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="n">cnt</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">100</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s</span><span class="p">.</span><span class="n">size</span><span class="p">();</span>
+<span class="w">        </span><span class="k">return</span><span class="w"> </span><span class="mi">100</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">ranges</span><span class="o">::</span><span class="n">count</span><span class="p">(</span><span class="n">s</span><span class="p">,</span><span class="w"> </span><span class="n">letter</span><span class="p">)</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s</span><span class="p">.</span><span class="n">size</span><span class="p">();</span>
 <span class="w">    </span><span class="p">}</span>
 <span class="p">};</span>
 </code></pre></div></td></tr></table></div>
 </div>
 <div class="tabbed-block">
 <div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span>
 <span class="normal">2</span>
-<span class="normal">3</span>
-<span class="normal">4</span>
-<span class="normal">5</span>
-<span class="normal">6</span>
-<span class="normal">7</span>
-<span class="normal">8</span>
-<span class="normal">9</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="kd">func</span><span class="w"> </span><span class="nx">percentageLetter</span><span class="p">(</span><span class="nx">s</span><span class="w"> </span><span class="kt">string</span><span class="p">,</span><span class="w"> </span><span class="nx">letter</span><span class="w"> </span><span class="kt">byte</span><span class="p">)</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="p">{</span>
-<span class="w">    </span><span class="nx">cnt</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="mi">0</span>
-<span class="w">    </span><span class="k">for</span><span class="w"> </span><span class="nx">i</span><span class="w"> </span><span class="o">:=</span><span class="w"> </span><span class="k">range</span><span class="w"> </span><span class="nx">s</span><span class="w"> </span><span class="p">{</span>
-<span class="w">        </span><span class="k">if</span><span class="w"> </span><span class="nx">s</span><span class="p">[</span><span class="nx">i</span><span class="p">]</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="nx">letter</span><span class="w"> </span><span class="p">{</span>
-<span class="w">            </span><span class="nx">cnt</span><span class="o">++</span>
-<span class="w">        </span><span class="p">}</span>
-<span class="w">    </span><span class="p">}</span>
-<span class="w">    </span><span class="k">return</span><span class="w"> </span><span class="nx">cnt</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">100</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="nb">len</span><span class="p">(</span><span class="nx">s</span><span class="p">)</span>
+<span class="normal">3</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="kd">func</span><span class="w"> </span><span class="nx">percentageLetter</span><span class="p">(</span><span class="nx">s</span><span class="w"> </span><span class="kt">string</span><span class="p">,</span><span class="w"> </span><span class="nx">letter</span><span class="w"> </span><span class="kt">byte</span><span class="p">)</span><span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="p">{</span>
+<span class="w">    </span><span class="k">return</span><span class="w"> </span><span class="nx">strings</span><span class="p">.</span><span class="nx">Count</span><span class="p">(</span><span class="nx">s</span><span class="p">,</span><span class="w"> </span><span class="nb">string</span><span class="p">(</span><span class="nx">letter</span><span class="p">))</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">100</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="nb">len</span><span class="p">(</span><span class="nx">s</span><span class="p">)</span>
 <span class="p">}</span>
 </code></pre></div></td></tr></table></div>
 </div>
 <div class="tabbed-block">
 <div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span>
 <span class="normal">2</span>
 <span class="normal">3</span>
-<span class="normal">4</span>
-<span class="normal">5</span>
-<span class="normal">6</span>
-<span class="normal">7</span>
-<span class="normal">8</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="kd">function</span><span class="w"> </span><span class="nx">percentageLetter</span><span class="p">(</span><span class="nx">s</span><span class="o">:</span><span class="w"> </span><span class="kt">string</span><span class="p">,</span><span class="w"> </span><span class="nx">letter</span><span class="o">:</span><span class="w"> </span><span class="kt">string</span><span class="p">)</span><span class="o">:</span><span class="w"> </span><span class="kt">number</span><span class="w"> </span><span class="p">{</span>
-<span class="w">    </span><span class="kd">let</span><span class="w"> </span><span class="nx">count</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">0</span><span class="p">;</span>
-<span class="w">    </span><span class="kd">let</span><span class="w"> </span><span class="nx">total</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">s</span><span class="p">.</span><span class="nx">length</span><span class="p">;</span>
-<span class="w">    </span><span class="k">for</span><span class="w"> </span><span class="p">(</span><span class="kd">let</span><span class="w"> </span><span class="nx">i</span><span class="w"> </span><span class="k">of</span><span class="w"> </span><span class="nx">s</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
-<span class="w">        </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="nx">i</span><span class="w"> </span><span class="o">===</span><span class="w"> </span><span class="nx">letter</span><span class="p">)</span><span class="w"> </span><span class="nx">count</span><span class="o">++</span><span class="p">;</span>
-<span class="w">    </span><span class="p">}</span>
-<span class="w">    </span><span class="k">return</span><span class="w"> </span><span class="nb">Math</span><span class="p">.</span><span class="nx">floor</span><span class="p">((</span><span class="nx">count</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="nx">total</span><span class="p">)</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mf">100</span><span class="p">);</span>
+<span class="normal">4</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="kd">function</span><span class="w"> </span><span class="nx">percentageLetter</span><span class="p">(</span><span class="nx">s</span><span class="o">:</span><span class="w"> </span><span class="kt">string</span><span class="p">,</span><span class="w"> </span><span class="nx">letter</span><span class="o">:</span><span class="w"> </span><span class="kt">string</span><span class="p">)</span><span class="o">:</span><span class="w"> </span><span class="kt">number</span><span class="w"> </span><span class="p">{</span>
+<span class="w">    </span><span class="kd">const</span><span class="w"> </span><span class="nx">count</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nx">s</span><span class="p">.</span><span class="nx">split</span><span class="p">(</span><span class="s1">&#39;&#39;</span><span class="p">).</span><span class="nx">filter</span><span class="p">(</span><span class="nx">c</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="nx">c</span><span class="w"> </span><span class="o">===</span><span class="w"> </span><span class="nx">letter</span><span class="p">).</span><span class="nx">length</span><span class="p">;</span>
+<span class="w">    </span><span class="k">return</span><span class="w"> </span><span class="nb">Math</span><span class="p">.</span><span class="nx">floor</span><span class="p">((</span><span class="mf">100</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="nx">count</span><span class="p">)</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="nx">s</span><span class="p">.</span><span class="nx">length</span><span class="p">);</span>
 <span class="p">}</span>
 </code></pre></div></td></tr></table></div>
 </div>
 <div class="tabbed-block">
-<div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"> 1</span>
-<span class="normal"> 2</span>
-<span class="normal"> 3</span>
-<span class="normal"> 4</span>
-<span class="normal"> 5</span>
-<span class="normal"> 6</span>
-<span class="normal"> 7</span>
-<span class="normal"> 8</span>
-<span class="normal"> 9</span>
-<span class="normal">10</span>
-<span class="normal">11</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="k">impl</span><span class="w"> </span><span class="n">Solution</span><span class="w"> </span><span class="p">{</span>
+<div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span>
+<span class="normal">2</span>
+<span class="normal">3</span>
+<span class="normal">4</span>
+<span class="normal">5</span>
+<span class="normal">6</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="k">impl</span><span class="w"> </span><span class="n">Solution</span><span class="w"> </span><span class="p">{</span>
 <span class="w">    </span><span class="k">pub</span><span class="w"> </span><span class="k">fn</span><span class="w"> </span><span class="nf">percentage_letter</span><span class="p">(</span><span class="n">s</span><span class="p">:</span><span class="w"> </span><span class="nb">String</span><span class="p">,</span><span class="w"> </span><span class="n">letter</span><span class="p">:</span><span class="w"> </span><span class="kt">char</span><span class="p">)</span><span class="w"> </span><span class="p">-&gt;</span><span class="w"> </span><span class="kt">i32</span><span class="w"> </span><span class="p">{</span>
-<span class="w">        </span><span class="kd">let</span><span class="w"> </span><span class="k">mut</span><span class="w"> </span><span class="n">count</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">0</span><span class="p">;</span>
-<span class="w">        </span><span class="k">for</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="k">in</span><span class="w"> </span><span class="n">s</span><span class="p">.</span><span class="n">chars</span><span class="p">()</span><span class="w"> </span><span class="p">{</span>
-<span class="w">            </span><span class="k">if</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">letter</span><span class="w"> </span><span class="p">{</span>
-<span class="w">                </span><span class="n">count</span><span class="w"> </span><span class="o">+=</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span>
-<span class="w">            </span><span class="p">}</span>
-<span class="w">        </span><span class="p">}</span>
-<span class="w">        </span><span class="p">((</span><span class="n">count</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">100</span><span class="p">)</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s</span><span class="p">.</span><span class="n">len</span><span class="p">())</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="kt">i32</span>
+<span class="w">        </span><span class="kd">let</span><span class="w"> </span><span class="n">count</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">s</span><span class="p">.</span><span class="n">chars</span><span class="p">().</span><span class="n">filter</span><span class="p">(</span><span class="o">|&amp;</span><span class="n">c</span><span class="o">|</span><span class="w"> </span><span class="n">c</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="n">letter</span><span class="p">).</span><span class="n">count</span><span class="p">();</span>
+<span class="w">        </span><span class="p">(</span><span class="mi">100</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="n">count</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="kt">i32</span><span class="w"> </span><span class="o">/</span><span class="w"> </span><span class="n">s</span><span class="p">.</span><span class="n">len</span><span class="p">()</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="kt">i32</span><span class="p">)</span><span class="w"> </span><span class="k">as</span><span class="w"> </span><span class="kt">i32</span>
 <span class="w">    </span><span class="p">}</span>
 <span class="p">}</span>
 </code></pre></div></td></tr></table></div>