AOC 2018 solutions

aoc2018-1-2.swift

import Foundation 

let data = """
-1
1
"""

var visitedFrequencies = Set<Int>()
let parsedData = data.components(separatedBy: "\n").map{ Int($0)! }

var sum = 0
var done = false
repeat {
    sum = parsedData.reduce(sum) { (last, next) in
    let result = last + next
    if visitedFrequencies.contains(result) {
        print(result)
        done = true
    }
    visitedFrequencies.insert(result)
    return result
    }
} while !done
print("-====-")
print(sum)