DIY: Min Stack
Solve the interview question "Min Stack" in this lesson.
We'll cover the following...
Problem statement
You have to implement the minStack
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 ...