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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