From 8ebbb44dd19639cba8e25aaba5ffe00ba957c58f Mon Sep 17 00:00:00 2001
From: j-james
Date: Mon, 5 Dec 2022 02:23:07 -0800
Subject: Day Five

---
 2022/nim/day05/src/main.nim | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 2022/nim/day05/src/main.nim

(limited to '2022/nim/day05')

diff --git a/2022/nim/day05/src/main.nim b/2022/nim/day05/src/main.nim
new file mode 100644
index 0000000..5d7296f
--- /dev/null
+++ b/2022/nim/day05/src/main.nim
@@ -0,0 +1,36 @@
+# Day 5: Supply Stacks
+import std/[os, strutils, sequtils]
+
+let input = paramStr(1).readFile().strip().split("\n\n")
+
+func remove(a: string, chars: varargs[string]): string =
+  result = a
+  for c in chars:
+    result = result.replace(c, "")
+
+func transform(crates: string): seq[string] =
+  var c = 0
+  result = newSeq[string](9)
+  for i, stack in crates.strip().replace("    ", " [ ]").replace("] [", "")
+    .split("\n")[0..^2].mapIt(it.strip(chars = {'[', ']'})):
+    for j, c in stack:
+      result[j] = c & result[j]
+  result.applyIt(it.strip())
+
+let stacks = input[0].transform().mapIt(it.toSeq)
+let rules = input[1].split("\n")
+  .mapIt(it.remove("move ", "from ", "to ").split(" ").map(parseInt))
+
+var stack = stacks
+for rule in rules:
+  for count in 0 ..< rule[0]:
+    stack[rule[2]-1] &= stack[rule[1]-1].pop
+echo stack.foldl(a & b[b.len-1], "")
+
+stack = stacks
+for rule in rules:
+  var toAdd: seq[char]
+  for count in 0 ..< rule[0]:
+    toAdd = stack[rule[1]-1].pop & toAdd
+  stack[rule[2]-1] &= toAdd
+echo stack.foldl(a & b[b.len-1], "")
-- 
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