HACKER RANK Project Euler 34 - Digit Factorials - Solution.'Rb'

Project Euler Challenges-34 - Digit Factorials Solution

Problem Statement

This problem is a programming version of Problem 34 from projecteuler.net

19 is a curious number, as 1!+9!=1+362880=362881 which is divisible by 19.

Find the sum of all numbers below N which divide the sum of the factorial of their digits.

Note: as 1!,2!,⋯,9! are not sums they are not included.

Input Format 
Input contains an integer N

Output Format 
Print the answer corresponding to the test case.

Constraints 
10≤N≤105

Sample Input

20

Sample Output

19

Solution:

p (11..gets.to_i-1).select{|i|i.to_s.chars.map{|e|(2..e.to_i).reduce(1,:*)}.reduce(:+)%i==0}.reduce(0,:+)

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