From 59d680584428b13dfcd333674312ee64c9b77afb Mon Sep 17 00:00:00 2001
From: j-james
Date: Thu, 10 Dec 2020 17:26:33 -0800
Subject: Day Ten, Part II: 'Solve' recursively

---
 2020/ten.nim | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to '2020')

diff --git a/2020/ten.nim b/2020/ten.nim
index 9b8db68..3d96d0f 100644
--- a/2020/ten.nim
+++ b/2020/ten.nim
@@ -19,3 +19,15 @@ for adapter in adapters:
   jolt = adapter
 
 echo one * three
+
+var paths: int = 0
+proc recursive(adapters: seq[int]) =
+  for i in 0 .. (len(adapters) - 4):
+    if adapters[i+2] - adapters[i] <= 3:
+      recursive(adapters[i+2..^1])
+    if adapters[i+3] - adapters[i] <= 3:
+      recursive(adapters[i+3..^1])
+  inc(paths)
+
+recursive(adapters)
+echo paths
-- 
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