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hey everyone welcome back and lets write some more neat code today so today lets solve min stack so this is a pretty good design problem and the description is pretty simple so our job is to design a stack class that supports four operations obviously we want to push on to the stack we want to be able to pop from the stack and we want to be able to get the top value on the stack and last but not least the fourth one this is the part thats going to be tricky we want to be able to retrieve the minimum element in constant time so we want to be able to do all four of these operations in constant time now if you are familiar with a stack data structure you know that by default a stack will be able to support adding a value popping a value and getting the top value all three of those in of one time now im not going to go into the details of how to actually implement a stack you can implement it with a linked list or you can do it with an array in this problem were basically just going