Define factorial(n) to return the product of every integer from 1 through n. The function must use an iterative approach and return 1 for the base case n = 0.
Function Contract
Input: a non-negative integer n.
Output: the integer value of n!.
Constraints
0 <= n <= 10^4
n is an integer
The input is non-negative
Function Signature
deffactorial(n):
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