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- Add items to a stack in O(1) time and remove items from a stack on O(n) time.
- Add items to a stack in O(1) time and remove items from a stack in O(1) time.
- Add items to a stack in O(n) time and remove items from a stack on O(1) time.
- Add items to a stack in O(n) time and remove items from a stack on O(n) time.
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