Implement 2024 day 14 part 1 in Terraform

Author: bertptrs

2024/bonus/day14/main.tf

@@ -0,0 +1,33 @@
+variable "input" {
+  type = string
+}
+
+variable "width" {
+  type    = number
+  default = 101
+}
+
+variable "height" {
+  type    = number
+  default = 103
+}
+
+locals {
+  lines = regexall("p=(-?\\d+),(-?\\d+) v=(-?\\d+),(-?\\d+)", var.input)
+  positions = [
+    for line in local.lines :
+    [
+      ((line[0] + 100 * line[2]) % var.width + var.width) % var.width,
+      ((line[1] + 100 * line[3]) % var.height + var.height) % var.height,
+    ]
+  ]
+
+  q1 = length([for pos in local.positions : pos if pos[0] < floor(var.width / 2) && pos[1] < floor(var.height / 2)])
+  q2 = length([for pos in local.positions : pos if pos[0] > floor(var.width / 2) && pos[1] < floor(var.height / 2)])
+  q3 = length([for pos in local.positions : pos if pos[0] < floor(var.width / 2) && pos[1] > floor(var.height / 2)])
+  q4 = length([for pos in local.positions : pos if pos[0] > floor(var.width / 2) && pos[1] > floor(var.height / 2)])
+}
+
+output "part1" {
+  value = local.q1 * local.q2 * local.q3 * local.q4
+}

2024/bonus/main.tf

@@ -92,6 +92,15 @@ output "day13_2" {
   value = module.day13.part2
 }
 
+module "day14" {
+  source = "./day14"
+  input  = file("../inputs/14.txt")
+}
+
+output "day14_1" {
+  value = module.day14.part1
+}
+
 module "day19" {
   source = "./day19"
   input  = file("../inputs/19.txt")

2024/bonus/tests.tftest.hcl

@@ -165,6 +165,25 @@ run "day13" {
   }
 }
 
+run "day14" {
+  command = plan
+
+  module {
+    source = "./day14"
+  }
+
+  variables {
+    input  = file("../tests/samples/14.txt")
+    height = 7
+    width  = 11
+  }
+
+  assert {
+    condition     = output.part1 == 12
+    error_message = "Part1 output is wrong"
+  }
+}
+
 run "day19" {
   command = plan