| 1 | (ns aoc.core |
| 2 | [:require [clojure.string :as str]]) |
| 3 | |
| 4 | (def get-list-from-file |
| 5 | #(str/split #"," (slurp %))) |
| 6 | |
| 7 | (def parse-int |
| 8 | #(Integer/parseInt %)) |
| 9 | |
| 10 | (def opcodes {1 +, 2 *}) |
| 11 | (defn perform-operation [[opcode fst snd thd] program] |
| 12 | (let [opcode-fn (opcodes opcode) |
| 13 | fst-val (program fst) |
| 14 | snd-val (program snd)] |
| 15 | (assoc program thd (opcode-fn fst-val snd-val)))) |
| 16 | |
| 17 | (defn intcode [program] |
| 18 | (loop [program program |
| 19 | counter 0] |
| 20 | (let [opcode (program counter)] |
| 21 | (if (= opcode 99) |
| 22 | program |
| 23 | (recur (perform-operation (map program (take 4 (iterate inc counter))) |
| 24 | program) |
| 25 | (+ counter 4)))))) |
| 26 | |
| 27 | (defn -main [] |
| 28 | (let [input (mapv parse-int (get-list-from-file "input")) |
| 29 | fixed-input (assoc input 1 12 2 1)] |
| 30 | (println (first (intcode fixed-input))))) |
| 31 | |
| 32 | (-main) |