deploy: fffbcb0

Author: yanglbme

en/lc/1003/index.html

@@ -77712,10 +77712,10 @@ <h2 id="solutions">Solutions</h2>
 <!-- solution:start -->
 
 <h3 id="solution-1-stack">Solution 1: Stack</h3>
-<p>If the string is valid, it's length must be the multiple of $3$.</p>
-<p>We traverse the string and push every character into the stack $t$. If the size of stack $t$ is greater than or equal to $3$ and the top three elements of stack $t$ constitute the string <code>"abc"</code>, we pop the top three elements. Then we continue to traverse the next character of the string $s$.</p>
-<p>When the traversal is over, if the stack $t$ is empty, the string $s$ is valid, return <code>true</code>, otherwise return <code>false</code>.</p>
-<p>The time complexity is $O(n)$ and the space complexity is $O(n)$. Where $n$ is the length of the string $s$.</p>
+<p>We observe the operations in the problem and find that each time a string $\textit{"abc"}$ is inserted at any position in the string. Therefore, after each insertion operation, the length of the string increases by $3$. If the string $s$ is valid, its length must be a multiple of $3$. Thus, we first check the length of the string $s$. If it is not a multiple of $3$, then $s$ must be invalid, and we can directly return $\textit{false}$.</p>
+<p>Next, we traverse each character $c$ in the string $s$. We first push the character $c$ onto the stack $t$. If the length of the stack $t$ is greater than or equal to $3$, and the top three elements of the stack form the string $\textit{"abc"}$, then we pop the top three elements from the stack. We then continue to traverse the next character in the string $s$.</p>
+<p>After the traversal, if the stack $t$ is empty, it means the string $s$ is valid, and we return $\textit{true}$; otherwise, we return $\textit{false}$.</p>
+<p>The time complexity is $O(n)$, and the space complexity is $O(n)$. Here, $n$ is the length of the string $s$.</p>
 <div class="tabbed-set tabbed-alternate" data-tabs="1:5"><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" /><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></div>
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en/lc/3236/index.html

@@ -74979,9 +74979,9 @@
       <ul class="md-nav__list">
 
           <li class="md-nav__item">
-  <a href="#solution-1" class="md-nav__link">
+  <a href="#solution-1-recursive-cte-join" class="md-nav__link">
     <span class="md-ellipsis">
-      Solution 1
+      Solution 1: Recursive CTE + Join
     </span>
   </a>
 
@@ -77743,11 +77743,86 @@ <h2 id="description">Description</h2>
 <h2 id="solutions">Solutions</h2>
 <!-- solution:start -->
 
-<h3 id="solution-1">Solution 1</h3>
+<h3 id="solution-1-recursive-cte-join">Solution 1: Recursive CTE + Join</h3>
+<p>First, we use a recursive CTE to calculate the hierarchy level of each employee, where the CEO's level is $0$. We save <code>employee_id</code>, <code>employee_name</code>, <code>hierarchy_level</code>, <code>manager_id</code>, and <code>salary</code> into a temporary table <code>T</code>.</p>
+<p>Then, we query the CEO's salary and save it into a temporary table <code>P</code>.</p>
+<p>Finally, we join tables <code>T</code> and <code>P</code> to calculate the salary difference for each subordinate, and sort by <code>hierarchy_level</code> and <code>subordinate_id</code>.</p>
 <div class="tabbed-set tabbed-alternate" data-tabs="1:1"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">MySQL</label></div>
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-<div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div><pre><span></span><code>
+<div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"> 1</span>
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+<span class="normal">36</span>
+<span class="normal">37</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="o">#</span><span class="w"> </span><span class="k">Write</span><span class="w"> </span><span class="n">your</span><span class="w"> </span><span class="n">MySQL</span><span class="w"> </span><span class="n">query</span><span class="w"> </span><span class="k">statement</span><span class="w"> </span><span class="n">below</span>
+<span class="k">WITH</span><span class="w"> </span><span class="k">RECURSIVE</span>
+<span class="w">    </span><span class="n">T</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="p">(</span>
+<span class="w">        </span><span class="k">SELECT</span>
+<span class="w">            </span><span class="n">employee_id</span><span class="p">,</span>
+<span class="w">            </span><span class="n">employee_name</span><span class="p">,</span>
+<span class="w">            </span><span class="mi">0</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="n">hierarchy_level</span><span class="p">,</span>
+<span class="w">            </span><span class="n">manager_id</span><span class="p">,</span>
+<span class="w">            </span><span class="n">salary</span>
+<span class="w">        </span><span class="k">FROM</span><span class="w"> </span><span class="n">Employees</span>
+<span class="w">        </span><span class="k">WHERE</span><span class="w"> </span><span class="n">manager_id</span><span class="w"> </span><span class="k">IS</span><span class="w"> </span><span class="k">NULL</span>
+<span class="w">        </span><span class="k">UNION</span><span class="w"> </span><span class="k">ALL</span>
+<span class="w">        </span><span class="k">SELECT</span>
+<span class="w">            </span><span class="n">e</span><span class="p">.</span><span class="n">employee_id</span><span class="p">,</span>
+<span class="w">            </span><span class="n">e</span><span class="p">.</span><span class="n">employee_name</span><span class="p">,</span>
+<span class="w">            </span><span class="n">hierarchy_level</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="n">hierarchy_level</span><span class="p">,</span>
+<span class="w">            </span><span class="n">e</span><span class="p">.</span><span class="n">manager_id</span><span class="p">,</span>
+<span class="w">            </span><span class="n">e</span><span class="p">.</span><span class="n">salary</span>
+<span class="w">        </span><span class="k">FROM</span>
+<span class="w">            </span><span class="n">T</span><span class="w"> </span><span class="n">t</span>
+<span class="w">            </span><span class="k">JOIN</span><span class="w"> </span><span class="n">Employees</span><span class="w"> </span><span class="n">e</span><span class="w"> </span><span class="k">ON</span><span class="w"> </span><span class="n">t</span><span class="p">.</span><span class="n">employee_id</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">e</span><span class="p">.</span><span class="n">manager_id</span>
+<span class="w">    </span><span class="p">),</span>
+<span class="w">    </span><span class="n">P</span><span class="w"> </span><span class="k">AS</span><span class="w"> </span><span class="p">(</span>
+<span class="w">        </span><span class="k">SELECT</span><span class="w"> </span><span class="n">salary</span>
+<span class="w">        </span><span class="k">FROM</span><span class="w"> </span><span class="n">Employees</span>
+<span class="w">        </span><span class="k">WHERE</span><span class="w"> </span><span class="n">manager_id</span><span class="w"> </span><span class="k">IS</span><span class="w"> </span><span class="k">NULL</span>
+<span class="w">    </span><span class="p">)</span>
+<span class="k">SELECT</span>
+<span class="w">    </span><span class="n">employee_id</span><span class="w"> </span><span class="n">subordinate_id</span><span class="p">,</span>
+<span class="w">    </span><span class="n">employee_name</span><span class="w"> </span><span class="n">subordinate_name</span><span class="p">,</span>
+<span class="w">    </span><span class="n">hierarchy_level</span><span class="p">,</span>
+<span class="w">    </span><span class="n">t</span><span class="p">.</span><span class="n">salary</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">p</span><span class="p">.</span><span class="n">salary</span><span class="w"> </span><span class="n">salary_difference</span>
+<span class="k">FROM</span>
+<span class="w">    </span><span class="n">T</span><span class="w"> </span><span class="n">t</span>
+<span class="w">    </span><span class="k">JOIN</span><span class="w"> </span><span class="n">P</span><span class="w"> </span><span class="n">p</span>
+<span class="k">WHERE</span><span class="w"> </span><span class="n">hierarchy_level</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="mi">0</span>
+<span class="k">ORDER</span><span class="w"> </span><span class="k">BY</span><span class="w"> </span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span>
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