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@groob
Created December 2, 2019 03:30
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import Foundation
func cost(_ mass: Int) -> Int {
return (mass/3) - 2
}
func moduleCost(_ mass: Int, _ sum: Int = 0) -> Int {
let remainder = cost(mass)
let sum = sum + remainder
if cost(remainder) <= 0 {
return sum
}
return moduleCost(remainder, sum)
}
func totalFuelCost(fileURL: URL) throws -> Int {
return try String(contentsOf: fileURL)
.split(separator: "\n")
.map{ line in Int(String(line))! }
.map{ mass in moduleCost(mass) }
.reduce(0,+)
}
try totalFuelCost(fileURL: #fileLiteral(resourceName: "Day 1.txt"))
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