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en/chapter_stack_and_queue/summary/index.html
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@@ -3607,11 +3607,11 @@
<p><strong>Q</strong>: A double-ended queue seems like two stacks joined together. What are its uses?</p>
<p>A double-ended queue, which is a combination of a stack and a queue or two stacks joined together, exhibits both stack and queue logic. Thus, it can implement all applications of stacks and queues while offering more flexibility.</p>
<p><strong>Q</strong>: How exactly are undo and redo implemented?</p>
<p>Undo and redo operations are implemented using two stacks: Stack A for undo and Stack B for redo.</p>
<p>Undo and redo operations are implemented using two stacks: Stack <code>A</code> for undo and Stack <code>B</code> for redo.</p>
<ol>
<li>Each time a user performs an operation, it is pushed onto Stack A, and Stack B is cleared.</li>
<li>When the user executes an "undo", the most recent operation is popped from Stack A and pushed onto Stack B.</li>
<li>When the user executes a "redo", the most recent operation is popped from Stack B and pushed back onto Stack A.</li>
<li>Each time a user performs an operation, it is pushed onto Stack <code>A</code>, and Stack <code>B</code> is cleared.</li>
<li>When the user executes an "undo", the most recent operation is popped from Stack <code>A</code> and pushed onto Stack <code>B</code>.</li>
<li>When the user executes a "redo", the most recent operation is popped from Stack <code>B</code> and pushed back onto Stack <code>A</code>.</li>
</ol>
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