026 Reciprocal cycles.sf

#!/usr/bin/ruby

# Daniel "Trizen" Șuteu
# Edit: 25 July 2021
# https://github.com/trizen

# Find the value of d < 1000 for which 1/d contains the longest recurring cycle in its decimal fraction part.

# https://projecteuler.net/problem=26

# Runtime: 0.196s

var d = 1
var max = 0

for n in (2..1000) {

    var r = znorder(10, n)

    if (r > max) {
        max = r
        d = n
    }
}

say d