aoc2018_day1p2.kt

    fun partTwo(input: String): Int {
        var frequency = 0
        val diff = measureTimeMillis {
            val lines = input.split("\n").map { it.toIntOrNull() ?: 0 }
            val frequencies = mutableSetOf<Int>()

            for (i in 0..Int.MAX_VALUE) {
                frequency += lines[i % lines.count()]
                if (!frequencies.add(frequency)) break
            }
        }
        println("Time(ms): $diff")
        return frequency
    }