024 Lexicographic permutations.sf

#!/usr/bin/ruby

# Author: Trizen
# https://github.com/trizen

# What is the millionth lexicographic permutation of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9?

# https://projecteuler.net/problem=24

# Runtime: 5.387s (previously: 7.307s)

var i = 0
var arr = @(0..9)

arr.permutations { |*p|
    if (++i == 1e6) {
        say p.join
        break
    }
}