Solution to problem 34 in Julia

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David Doblas Jiménez 2021-09-01 10:52:53 +02:00
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#=
Created on 01 Sep 2021
@author: David Doblas Jiménez
@email: daviddoji@pm.me
Solution for Problem 34 of Project Euler
https://projecteuler.net/problem=34
=#
using BenchmarkTools
function Problem34()
#=
145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145.
Find the sum of all numbers which are equal to the sum of the factorial
of their digits.
Note: As 1! = 1 and 2! = 2 are not sums they are not included.
=#
ans = 0
for num in 10:2_540_160
sum_of_factorial = 0
for digit in reverse(digits(num))
sum_of_factorial += factorial(digit)
if sum_of_factorial == num
ans += sum_of_factorial
end
end
end
return ans
end
println("Time to evaluate Problem 34:")
@btime Problem34()
println("")
println("Result for Problem 34: ", Problem34())