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Engineering, 04.04.2020 00:10 vbucks72

Suppose that an initially empty stack performs (in some order) 18 push operations, 8 peek operations, and 12 pop operations. 3 of the peek operations and 5 of the pop operations return null, indicating that the stack is currently empty. After all of these operations, how many items are in the stack?

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Suppose that an initially empty stack performs (in some order) 18 push operations, 8 peek operations...
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