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Q11 /20

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AA) The three `if` statements in lines 6-11 cause the program to be slow. We can speed up the program by replacing them with a single `for` statement and calling `rec` inside the statement.BB) When `n` is equal to 1000, an integer overflow occurs and causes an infinite loop. If we use a `real` data type instead of a `multiple precision integer` type, we can prevent an infinite loop and then speed up the program.CC) Although `rec(i)` always returns the same value, every time `rec(i)` is called, it calls the function three times recursively. That is why the program is so slow. We can speed up the program by storing the value `rec(i)` for each `i` when it is calculated for the first time, and returning that value every time it is called thereafter.DD) None of the above.

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Answer: A. A) The three `if` statements in lines 6-11 cause the program to be slow. We can speed up the program by replacing them with a single `for` statement and calling `rec` inside the statement.

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Q11 /20

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