Day 2 - Inventory Management System

groupingBy

eachCount

claims.map { it.cells }.reduce { ... }

claims.flatMap { }

@Regex

claims.forEach { claim ->
    for (row in claim.x until claim.x + claim.width) {
        for (col in claim.y until claim.y + claim.height) {
            countArray[row][col] = countArray[row][col] + 1
        }
    }
}

println("part 1: ${countArray.flatMap { it.asIterable() }.count { it > 1 }}")

claims.forEach { claim ->
    for (row in claim.x until claim.x + claim.width) {
        for (col in claim.y until claim.y + claim.height) {
            if (countArray[row][col] != 1) {
                return@forEach
            }
        }
    }
    println("part 2: ${claim.id}")
}

LinkedList

.toMutableList()

ArrayList

1159/270 ms

3692/3002 ms

15513/12944 ms