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hello-algo/en/docs/chapter_stack_and_queue/index.md

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---
comments: true
icon: material/stack-overflow
---
# Chapter 5.   Stack and Queue
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![Stack and Queue](../assets/covers/chapter_stack_and_queue.jpg){ class="cover-image" }
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!!! abstract
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A stack is like cats placed on top of each other, while a queue is like cats lined up one by one.
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They represent the logical relationships of Last-In-First-Out (LIFO) and First-In-First-Out (FIFO), respectively.
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## Chapter Contents
- [5.1   Stack](https://www.hello-algo.com/en/chapter_stack_and_queue/stack/)
- [5.2   Queue](https://www.hello-algo.com/en/chapter_stack_and_queue/queue/)
- [5.3   Double-ended Queue](https://www.hello-algo.com/en/chapter_stack_and_queue/deque/)
- [5.4   Summary](https://www.hello-algo.com/en/chapter_stack_and_queue/summary/)