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Update the chapter of stack and queue.
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## 队列常用操作
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队列的常用操作见下表,方法名需根据特定语言来确定。
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队列的常用操作见下表,方法名需根据语言来确定,此处以 Java 为例。
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<div class="center-table" markdown>
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| --------- | -------------------------- | -------- |
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| push() | 元素入队,即将元素添加至队尾 | $O(1)$ |
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| poll() | 队首元素出队 | $O(1)$ |
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| front() | 访问队首元素 | $O(1)$ |
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| size() | 获取队列的长度 | $O(1)$ |
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| isEmpty() | 判断队列是否为空 | $O(1)$ |
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| peek() | 访问队首元素 | $O(1)$ |
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</div>
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