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---
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id: stack
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title: Stack
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---
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## More questions
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- Implementation of an interpreter for a small language that does multiplication/addition/etc.
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- Design a `MinStack` data structure that supports a `min()` operation that returns the minimum value in the stack in O(1) time.
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- Write an algorithm to determine if all of the delimiters in an expression are matched and closed.
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- E.g. `{ac[bb]}`, `[dklf(df(kl))d]{}` and `{[[[]]]}` are matched. But `{3234[fd` and `{df][d}` are not.
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- [Source](http://blog.gainlo.co/index.php/2016/09/30/uber-interview-question-delimiter-matching/)
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- Sort a stack in ascending order using an additional stack.
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