do 2017 day 5

2017/src/day05.clj

@@ -0,0 +1,30 @@
+(ns day05
+  (:require input-manager))
+
+(def input (->> (input-manager/get-input 2017 5)
+                (mapv parse-long)))
+
+(def MAX_IDX (count input))
+
+;; part 1
+(loop [steps 0
+       maze input
+       idx 0]
+  (let [maze' (update maze idx inc)
+        idx' (+ (maze idx) idx)]
+    (if (< -1 idx' MAX_IDX)
+      (recur (inc steps) maze' idx')
+      (inc steps))))
+
+;; part 2
+(loop [steps 0
+       maze input
+       idx 0]
+  (let [offset (maze idx)
+        maze' (update maze idx (if (>= offset 3)
+                                 dec
+                                 inc))
+        idx'  (+ offset idx)]
+    (if (< -1 idx' MAX_IDX)
+      (recur (inc steps) maze' idx')
+      (inc steps))))