Hackerrank - Project Euler+ #020 - Factorial digit sum

Hackerrank – Problem description

The problem description Hackerrank.

Solution

The catch is to have a support for big numbers operations in your progamming language.

Do a factorial and sum the numbers.

I created solution in:

Ruby

All solutions are also available on my GitHub profile.

Ruby

def factorial(n)
  fact = 1
  for i in 2..n do
    fact *= i
  end
  return fact
end


def sum_digits(number)
  chars = number.to_s.chars
  sum = 0
  chars.each { |char| sum += char.to_i }
  return sum
end
 
gets.chomp.to_i.times do
  n = gets.chomp.to_i
  puts sum_digits(factorial(n))
end

def factorial(n)

fact = 1

for i in 2..n do

fact *= i

end

return fact

end

def sum_digits(number)

chars = number.to_s.chars

sum = 0

chars.each { |char| sum += char.to_i }

return sum

end

gets.chomp.to_i.times do

n = gets.chomp.to_i

puts sum_digits(factorial(n))

end

Pavol Pidanič

I can count to 1023 with 10 fingers

Hackerrank – Project Euler+ #020 – Factorial digit sum

Hackerrank – Problem description

Solution

Ruby

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