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en/docs/chapter_stack_and_queue/summary.md
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# 5.4   Summary
### 1.   Key Review
### 1.   Key review
- Stack is a data structure that follows the Last-In-First-Out (LIFO) principle and can be implemented using arrays or linked lists.
- In terms of time efficiency, the array implementation of the stack has a higher average efficiency. However, during expansion, the time complexity for a single push operation can degrade to $O(n)$. In contrast, the linked list implementation of a stack offers more stable efficiency.