blob: 6489d9cd9828af4edaa5d0d922f8c76d5c6232c6 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
(ns org.vuxu.aoc2021.day25
(:require [clojure.string :as str]))
(def data
(->> (slurp "day25")
str/split-lines
(mapv (partial mapv identity))))
(defn step-east [data]
(let [lx (count (first data))]
(vec (for [y (range (count data))]
(vec (for [x (range lx)]
(cond
(and (= (get-in data [y (mod (dec x) lx)]) \>)
(= (get-in data [y x]) \.))
\>
(and (= (get-in data [y x]) \>)
(= (get-in data [y (mod (inc x) lx)]) \.))
\.
:else
(get-in data [y x]))))))))
(defn step-south [data]
(let [ly (count data)]
(vec (for [y (range ly)]
(vec (for [x (range (count (first data)))]
(cond
(and (= (get-in data [(mod (dec y) ly) x]) \v)
(= (get-in data [y x]) \.))
\v
(and (= (get-in data [y x]) \v)
(= (get-in data [(mod (inc y) ly) x]) \.))
\.
:else
(get-in data [y x]))))))))
(def part1
(loop [i 1
data data]
(let [data' (step-south (step-east data))]
(if (= data data')
i
(recur (inc i) data')))))
;; => 601
|