Python/project_euler/problem_20/sol2.py
Dhruv 11a5afd8a1
Add type hints and default args for problem 20 (#2962)
- Improved variable names
- Added type hints
- Added default argument values for validate_solutions script
2020-10-07 17:59:55 +08:00

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"""
Problem 20: https://projecteuler.net/problem=20
n! means n × (n 1) × ... × 3 × 2 × 1
For example, 10! = 10 × 9 × ... × 3 × 2 × 1 = 3628800,
and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27.
Find the sum of the digits in the number 100!
"""
from math import factorial
def solution(num: int = 100) -> int:
"""Returns the sum of the digits in the factorial of num
>>> solution(100)
648
>>> solution(50)
216
>>> solution(10)
27
>>> solution(5)
3
>>> solution(3)
6
>>> solution(2)
2
>>> solution(1)
1
"""
return sum([int(x) for x in str(factorial(num))])
if __name__ == "__main__":
print(solution(int(input("Enter the Number: ").strip())))