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Implement the following operations of a queue using stacks.
push(x) -- Push element x to the back of queue.
pop() -- Removes the element from in front of queue.
peek() -- Get the front element.
empty() -- Return whether the queue is empty.
Notes:
You must use only standard operations of a stack -- which means only push to top, peek/pop from top, size, and is empty operations are valid.
Depending on your language, stack may not be supported natively. You may simulate a stack by using a list or deque (double-ended queue), as long as you use only standard operations of a stack.
You may assume that all operations are valid (for example, no pop or peek operations will be called on an empty queue).
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Implement the following operations of a queue using stacks.
push(x) -- Push element x to the back of queue.
pop() -- Removes the element from in front of queue.
peek() -- Get the front element.
empty() -- Return whether the queue is empty.
Notes:
You must use only standard operations of a stack -- which means only push to top, peek/pop from top, size, and is empty operations are valid.
Depending on your language, stack may not be supported natively. You may simulate a stack by using a list or deque (double-ended queue), as long as you use only standard operations of a stack.
You may assume that all operations are valid (for example, no pop or peek operations will be called on an empty queue).
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<h3 style="display:inline">Implement Queue using Stacks</h3>
<span class="total-ac text-info">Total Accepted: <strong>8001</strong></span>
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<p><p>
Implement the following operations of a queue using stacks.
<ul>
<li>
push(x) -- Push element x to the back of queue.
</li>
<li>
pop() -- Removes the element from in front of queue.
</li>
<li>
peek() -- Get the front element.
</li>
<li>
empty() -- Return whether the queue is empty.
</li>
</ul>
<b>Notes:</b><br>
<ul>
<li>You must use <i>only</i> standard operations of a stack -- which means only <code>push to top</code>, <code>peek/pop from top</code>, <code>size</code>, and <code>is empty</code> operations are valid.</li>
<li>Depending on your language, stack may not be supported natively. You may simulate a stack by using a list or deque (double-ended queue), as long as you use only standard operations of a stack.</li>
<li>You may assume that all operations are valid (for example, no pop or peek operations will be called on an empty queue).</li>
</ul>
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