From 9ba9242e3c1fe4d9f46b0cedc4d71ec42ad9ebf7 Mon Sep 17 00:00:00 2001
From: Daniel Flanagan <daniel@lyte.dev>
Date: Tue, 21 Dec 2021 12:43:10 -0600
Subject: [PATCH] Starting on day21 part 2

---
 2021/nim/day20.nim |  4 +---
 2021/nim/day21.nim | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 3 deletions(-)
 create mode 100644 2021/nim/day21.nim

diff --git a/2021/nim/day20.nim b/2021/nim/day20.nim
index 79b72fa..3206494 100644
--- a/2021/nim/day20.nim
+++ b/2021/nim/day20.nim
@@ -63,7 +63,6 @@ proc solver(input: Lines, times: int): uint64 =
     if v: inc result
 
 proc p1(input: Lines): uint64 = input.solver(2)
-
 proc p2(input: Lines): uint64 = input.solver(50)
 
 const input = """
@@ -73,6 +72,5 @@ const input = """
 #....
 ##..#
 ..#..
-..###
-""".strip().split('\n')
+..### """.strip().split('\n')
 doDayX 20, (n: int) => n.loadInput, p1, p2, (input, 35'u64, 3351'u64)
diff --git a/2021/nim/day21.nim b/2021/nim/day21.nim
new file mode 100644
index 0000000..6886fe8
--- /dev/null
+++ b/2021/nim/day21.nim
@@ -0,0 +1,32 @@
+import ./common, std/[sequtils, algorithm, sugar, sets, strformat, strutils, tables, options, json, hashes, random]
+
+proc p1(input: Lines): uint64 =
+  const DIE_FACES = 100
+  const TARGET_SCORE = 1000
+  const BOARD_POSITIONS = 10
+
+  var scores = [0, 0]
+  var pos = [input[0].split(": ")[1].parseInt - 1, input[1].split(": ")[1].parseInt - 1]
+  var rollNum = 1
+  var turn = 0
+  while scores[0] < TARGET_SCORE and scores[1] < TARGET_SCORE:
+    var move = 0
+    for _ in 1..3:
+      move += rollNum mod DIE_FACES
+      inc rollNum
+    pos[turn] = (pos[turn] + move) mod BOARD_POSITIONS
+    scores[turn] += pos[turn] + 1
+    echo &"{move}, {pos[turn]}, {scores}"
+    turn = (turn + 1) mod 2
+
+  echo rollNum, scores
+  uint64(scores[turn mod 2] * (rollNum - 1))
+
+proc p2(input: Lines): uint64 =
+  0
+
+const input = """
+Player 1 starting position: 4
+Player 2 starting position: 8
+""".strip().split('\n')
+doDayX 21, (n: int) => n.loadInput, p1, p2, (input, 739785'u64, 444356092776315'u64)