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44 lines
503 B
Markdown
44 lines
503 B
Markdown
## stacks
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<br>
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### stacks
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<br>
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* last in, first out structures (LIFO)
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* useful in certain recursive algorithms, where you can push temp data as you recurse, and remove them from the (memory or data structure) stack as you backtrace.
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<br>
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---
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## examples
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<br>
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#### `stack.py`
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<br>
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```python
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python3 stack.py
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Testing Stack...
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Stack: [12, 13, 14, 15, 16, 17, 18, 19, 20]
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Stack size: 9
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Stack peek: 20
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Stack is empty: False
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Stack min: 12
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Popping...
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20
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19
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18
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17
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16
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Stack: [12, 13, 14, 15]
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```
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