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krahets
2024-05-01 07:30:10 +08:00
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en/docs/chapter_stack_and_queue/deque.md
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@@ -18,14 +18,14 @@ The common operations in a double-ended queue are listed below, and the names of
<div class="center-table" markdown>
| Method Name | Description | Time Complexity |
| ------------- | --------------------------- | --------------- |
| Method Name | Description | Time Complexity |
| ------------- | -------------------------- | --------------- |
| `pushFirst()` | Add an element to the head | $O(1)$ |
| `pushLast()` | Add an element to the tail | $O(1)$ |
| `popFirst()` | Remove the first element | $O(1)$ |
| `popLast()` | Remove the last element | $O(1)$ |
| `peekFirst()` | Access the first element | $O(1)$ |
| `peekLast()` | Access the last element | $O(1)$ |
| `pushLast()` | Add an element to the tail | $O(1)$ |
| `popFirst()` | Remove the first element | $O(1)$ |
| `popLast()` | Remove the last element | $O(1)$ |
| `peekFirst()` | Access the first element | $O(1)$ |
| `peekLast()` | Access the last element | $O(1)$ |
</div>
@@ -360,7 +360,7 @@ Recall from the previous section that we used a regular singly linked list to im
For a double-ended queue, both the head and the tail can perform enqueue and dequeue operations. In other words, a double-ended queue needs to implement operations in the opposite direction as well. For this, we use a "doubly linked list" as the underlying data structure of the double-ended queue.
As shown in the Figure 5-8 , we treat the head and tail nodes of the doubly linked list as the front and rear of the double-ended queue, respectively, and implement the functionality to add and remove nodes at both ends.
As shown in Figure 5-8, we treat the head and tail nodes of the doubly linked list as the front and rear of the double-ended queue, respectively, and implement the functionality to add and remove nodes at both ends.
=== "LinkedListDeque"
![Implementing Double-Ended Queue with Doubly Linked List for Enqueue and Dequeue Operations](deque.assets/linkedlist_deque_step1.png){ class="animation-figure" }
@@ -2264,7 +2264,7 @@ The implementation code is as follows:
### 2. &nbsp; Implementation based on array
As shown in the Figure 5-9 , similar to implementing a queue with an array, we can also use a circular array to implement a double-ended queue.
As shown in Figure 5-9, similar to implementing a queue with an array, we can also use a circular array to implement a double-ended queue.
=== "ArrayDeque"
![Implementing Double-Ended Queue with Array for Enqueue and Dequeue Operations](deque.assets/array_deque_step1.png){ class="animation-figure" }