Attempt at part two, OOM

2025/day02/main.tf

@@ -12,6 +12,18 @@ module "check_range" {
   max = local.min_max[count.index][1]
 }
 
+module "check_range2" {
+  source = "./range2"
+  count  = length(local.min_max)
+
+  min = local.min_max[count.index][0]
+  max = local.min_max[count.index][1]
+}
+
 output "part1" {
   value = sum(module.check_range[*].invalid_sum)
 }
+
+output "part2" {
+  value = sum(module.check_range2[*].invalid_sum)
+}

2025/day02/range/item/main.tf

@@ -1,7 +1,15 @@
-variable "half" {
+variable "part" {
   type = number
 }
 
-output "full" {
-  value = tonumber("${var.half}${var.half}")
+variable "repetitions" {
+  type = number
+}
+
+locals {
+  repeated = [for _ in range(var.repetitions) : tostring(var.part)]
+}
+
+output "full" {
+  value = join("", local.repeated)
 }

2025/day02/range/main.tf

@@ -6,31 +6,41 @@ variable "max" {
   type = number
 }
 
-locals {
-  digits       = floor(length(tostring(var.max)) / 2)
-  maximum      = substr(tostring(var.max), 0, local.digits)
-  real_maximum = length(tostring(var.max)) % 2 == 0 ? tonumber(local.maximum) : pow(10, local.digits)
+variable "repetitions" {
+  type    = number
+  default = 2
+}
 
-  min_digits = max(floor(length(tostring(var.min)) / 2), 1)
+locals {
+  digits       = floor(length(tostring(var.max)) / var.repetitions)
+  maximum      = substr(tostring(var.max), 0, local.digits)
+  real_maximum = length(tostring(var.max)) % var.repetitions == 0 ? tonumber(local.maximum) : pow(10, local.digits)
+
+  min_digits = max(floor(length(tostring(var.min)) / var.repetitions), 1)
   minimum    = tonumber(substr(tostring(var.min), 0, local.min_digits))
 
   count = max(local.real_maximum - local.minimum + 1, 1)
 
-  can_work = anytrue([for n in range(length(tostring(var.min)), length(tostring(var.max)) + 1) : n % 2 == 0])
+  can_work = anytrue([for n in range(length(tostring(var.min)), length(tostring(var.max)) + 1) : n % var.repetitions == 0])
 }
 
 // This "candidates" module ought really be a list comprehension from range, but Terraform does not
 // allow you to create ranges longer than 1024.
 module "candidates" {
-  source = "./item"
-  count  = local.can_work ? local.count : 0
-  half   = count.index + local.minimum
+  source      = "./item"
+  count       = local.can_work ? local.count : 0
+  part        = count.index + local.minimum
+  repetitions = var.repetitions
 }
 
 locals {
-  valid = [for n in module.candidates[*].full : n if n >= var.min && n <= var.max]
+  invalid = [for n in module.candidates[*].full : n if n >= var.min && n <= var.max]
 }
 
 output "invalid_sum" {
-  value = length(local.valid) > 0 ? sum(local.valid) : 0
+  value = length(local.invalid) > 0 ? sum(local.invalid) : 0
+}
+
+output "invalid" {
+  value = toset(local.invalid)
 }