Factorial (iterative)

Classic iterative multiplication.

loops math

Implement `factorial(n: int) -> int`.

Return n! (the product 1 × 2 × … × n). `factorial(0) == 1`.

Constraints

0 ≤ n ≤ 20

Example

>>> factorial(5)
120

8 points ~8 min

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Hints

Use a running product starting at 1, loop range(1, n+1).

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