Here's a version of part1 that does everything in two passes of the list instead of four.
fun part1(input: String) = input.chunked(25 * 6) .asSequence() .map { layer -> layer.groupBy { it } .mapValues { (_, v) -> v.size } }.minBy { it.getOrDefault('0', 0) }?.let { it.getOrDefault('1', 0) * it.getOrDefault('2', 0) } ?: 0
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Here's a version of part1 that does everything in two passes of the list instead of four.