081 Path sum two ways.sf

#!/usr/bin/ruby

# Author: Daniel "Trizen" Șuteu
# License: GPLv3
# Website: https://github.com/trizen

# https://projecteuler.net/problem=81

# usage: sidef problem_081.sf < p081_matrix.txt

var matrix = []

ARGF.each { |line|
    matrix << line.trim.split(',').map{.to_n}
}

var end = matrix.end

func path(i, j) is cached {
    var paths = []

    if (i < end) {
        paths << path(i+1, j)
    }

    if (j < end) {
        paths << path(i, j+1)
    }

    matrix[i][j] + (paths.min \\ 0)
}

say path(0, 0)