2023 Day 15 Part 1

2023/day15.nim

@@ -0,0 +1,53 @@
+import std/algorithm
+import std/deques
+import std/enumerate
+import std/math
+import std/options
+import std/sequtils
+import std/sets
+import std/strscans
+import std/strutils
+import std/sugar
+import std/tables
+import std/terminal
+
+proc dbg[T](v: T): T = (echo(v); v)
+
+func empty[T](v: seq[T]): bool = v.len == 0
+
+proc split[T](v: seq[T], pred: proc(elt: T): bool {.noSideEffect.}): seq[seq[T]] =
+  var current: seq[T]
+  for elt in v:
+    if pred(elt):
+      result.add current
+      current = @[]
+    else:
+      current.add elt
+  result.add current
+
+func join[T](parts: seq[seq[T]], sep: T): seq[T] =
+  if parts.len > 0:
+    result &= parts[0]
+
+  for part in parts[1..^1]:
+    result.add sep
+    result &= part
+
+type Init = tuple
+  steps: seq[string]
+
+func parseInit(text: string): Init =
+  result.steps = text.strip.split(',')
+
+func hash(step: string): int =
+  for c in step:
+    result = ((result + c.ord) * 17) mod 256
+
+proc part1(input: string): int =
+  let text = readFile(input)
+  let init = parseInit(text)
+
+  init.steps.map(hash).sum
+
+echo part1("input/test.txt")
+echo part1("input/day15.txt")