May 19, 2020

[ My apologies that this exercise is so long delayed. We have been rewriting all of our business practices in the light of the pandemic, and work has been madness. The biggest projects are now complete, and we have retreated to merely super-busy, so maybe I will have time to write some more exercises. I hope everyone is well; I am. ]

Today’s task is to implement a minstack data structure that provides the normal stack operations push, pop and top and also the operation least which returns the smallest item in the stack without altering the stack in any way. All four operations must operate in O(1) time and O(n) space, where n is the size of the stack.

Your task is to implement a minstack as described above. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.

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