DIY: Min Stack
Solve the interview question "Min Stack" in this lesson.
We'll cover the following
Problem statement
You have to implement the min_stack class, which has a min() function. Whenever min() is called, the minimum value of the stack is returned in O(1) time. The element is not popped from the stack. Its value is simply returned.
Input
The input will be a stream of numbers from which you have to create a min stack.
Output
The output will return the minimum number in O(1) time.
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