Question: Suppose an initially empty stack S has performed a total of 3 0 push operations, 1 2 top ( or peek ) operations, and 1

Suppose an initially empty stack S has performed a total of 30 push operations, 12 top (or peek) operations, and 10 pop operations, 4 of which returned null to indicate an empty stack. What is the current size of S?
Suppose an initially empty stack S has performed a total of

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