adventofcode/2024/bonus/day11/step/main.tf

variable "prev" {
  type = map(number)
}

module "transform" {
  source   = "../transform"
  for_each = var.prev

  num = each.key
}

locals {
  by_value = flatten([
    for key, value in module.transform :
    [for result in value.result : { num = result, count = var.prev[key] }]
  ])

  grouped = { for kv in local.by_value : kv.num => kv.count... }
}

output "next" {
  value = { for num, groups in local.grouped : num => sum(groups) }
}