Question
Consider a `Stack` data structure implemented with
`push` and `pop` operations. What is the final state of the stack after the following sequence of operations? ``` Stack s; s.push(10); s.push(20); s.pop(); s.push(30); s.push(40); s.pop(); ```Solution
Dry Run (Stack: Last In, First Out): `s.push(10)`: Stack: `[10]` `s.push(20)`: Stack: `[10, 20]` `s.pop()`: Removes 20. Stack: `[10]` `s.push(30)`: Stack: `[10, 30]` `s.push(40)`: Stack: `[10, 30, 40]` `s.pop()`: Removes 40. Stack: `[10, 30]`
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