Exercises 17.3-4

What is the total cost of executing n of the stack operations PUSH,
POP, and MULTIPOP, assuming that the stack begins with s0 objects and
finishes with sn objects?
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Chapter 17.3 is about the potential method.

Let s be the number of items in the stack, and choose potential
function Φ to be |s - s0|,  the total cost shall be O(n).

Is my answer correct!  Thanks!
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