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12.cljs
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(def test-data ["F10"
"N3"
"F7"
"R90"
"F11"])
(def raw-instructions ["R90"
"N2"
"N2"
"F94"
"R90"
"E3"
"F2"
"L90"
"L90"
"F66"
"S5"
"L90"
"W3"
"R90"
"N3"
"W2"
"N2"
"W1"
"R90"
"E3"
"F100"
"S4"
"F66"
"R180"
"F96"
"R90"
"N2"
"R90"
"E2"
"S3"
"E1"
"F65"
"W4"
"F6"
"L180"
"W2"
"L90"
"F95"
"L90"
"F97"
"E2"
"F36"
"E2"
"R90"
"E4"
"F98"
"N4"
"F70"
"S1"
"R270"
"E1"
"F13"
"R90"
"W1"
"L90"
"F82"
"S2"
"R90"
"N2"
"F80"
"N1"
"R90"
"F26"
"W4"
"F23"
"S5"
"F72"
"N5"
"W2"
"N5"
"F47"
"L270"
"F18"
"W1"
"L90"
"F91"
"R90"
"W5"
"N2"
"F60"
"E5"
"S3"
"R90"
"R180"
"S3"
"L90"
"W4"
"F80"
"S2"
"L90"
"F31"
"W1"
"L90"
"F45"
"S3"
"F64"
"N1"
"W4"
"N2"
"R180"
"W3"
"R90"
"S1"
"F7"
"W1"
"R180"
"W1"
"S4"
"E4"
"W4"
"F87"
"R90"
"N5"
"F65"
"W4"
"F15"
"E5"
"N5"
"L90"
"F36"
"E1"
"F70"
"E1"
"L180"
"F42"
"L90"
"F9"
"L90"
"E4"
"F2"
"F35"
"N4"
"E4"
"N2"
"L90"
"N4"
"R90"
"F100"
"S3"
"F13"
"E1"
"S4"
"F66"
"L90"
"F75"
"E5"
"R180"
"E2"
"L90"
"W4"
"F89"
"S5"
"R90"
"E4"
"F5"
"R270"
"E3"
"S5"
"R90"
"F65"
"S5"
"R180"
"S3"
"W4"
"F68"
"W1"
"F62"
"W1"
"F99"
"F96"
"R90"
"E1"
"R90"
"L180"
"F96"
"W4"
"N2"
"W2"
"R90"
"F32"
"N1"
"E1"
"L90"
"E1"
"S3"
"F6"
"S4"
"E1"
"N2"
"W5"
"S5"
"E4"
"F3"
"F58"
"N1"
"F96"
"E5"
"F31"
"R90"
"F74"
"R180"
"N2"
"W1"
"F65"
"L90"
"F45"
"F73"
"R90"
"S1"
"R270"
"N5"
"L90"
"W1"
"N3"
"L90"
"F36"
"R90"
"N4"
"L180"
"W4"
"N5"
"R180"
"N1"
"R90"
"N1"
"R270"
"F80"
"R90"
"S5"
"E3"
"F49"
"W5"
"F27"
"E1"
"N2"
"W4"
"S3"
"L90"
"F100"
"N1"
"F28"
"E2"
"F88"
"S1"
"R90"
"F14"
"S4"
"L180"
"F93"
"E1"
"L90"
"F64"
"L90"
"L90"
"F84"
"E4"
"F69"
"W1"
"R90"
"E5"
"N2"
"W1"
"N3"
"F10"
"S2"
"F64"
"F10"
"R180"
"W3"
"N1"
"F82"
"S2"
"W1"
"R90"
"W1"
"L90"
"W2"
"N3"
"F95"
"E4"
"N3"
"N2"
"E3"
"E1"
"N1"
"W5"
"R90"
"W3"
"S3"
"E3"
"L90"
"W3"
"N5"
"F61"
"S3"
"F50"
"F71"
"E1"
"E1"
"F63"
"L90"
"W5"
"S1"
"R90"
"F29"
"L90"
"S1"
"R90"
"S1"
"L90"
"W4"
"N4"
"R270"
"S1"
"F87"
"R90"
"F82"
"W1"
"L90"
"S4"
"L90"
"W2"
"N4"
"R90"
"F61"
"R90"
"N5"
"F38"
"W3"
"L90"
"F56"
"N1"
"R90"
"W1"
"S2"
"F97"
"S5"
"R90"
"E1"
"F97"
"R270"
"N2"
"L180"
"F14"
"E1"
"R90"
"F70"
"L180"
"S4"
"E3"
"L90"
"N3"
"F87"
"E3"
"N3"
"R90"
"F59"
"F18"
"W5"
"F71"
"E3"
"S5"
"W3"
"R180"
"F71"
"S3"
"W5"
"F47"
"N5"
"L90"
"F79"
"N3"
"F40"
"W5"
"S2"
"F59"
"W3"
"F2"
"W1"
"F63"
"R90"
"S4"
"L90"
"S1"
"E5"
"F33"
"L180"
"F83"
"E5"
"S3"
"W1"
"F66"
"R270"
"N4"
"F29"
"W5"
"F83"
"W1"
"R90"
"N5"
"W3"
"F58"
"S4"
"R90"
"F36"
"S1"
"F67"
"W1"
"S4"
"F56"
"E2"
"F88"
"N4"
"L90"
"F71"
"W3"
"F88"
"R180"
"F50"
"R90"
"E4"
"R90"
"S1"
"W2"
"L90"
"N1"
"R90"
"E5"
"N1"
"F39"
"L180"
"E5"
"R90"
"W4"
"L180"
"W3"
"R90"
"W3"
"L90"
"S5"
"W5"
"S2"
"L90"
"N3"
"W5"
"R180"
"F74"
"E1"
"N1"
"N4"
"R90"
"N2"
"W4"
"F34"
"L90"
"E4"
"L90"
"S4"
"L90"
"W3"
"F83"
"N1"
"L90"
"F58"
"W5"
"F38"
"L180"
"N1"
"L90"
"S4"
"F45"
"E4"
"S3"
"L90"
"E1"
"S2"
"F30"
"E2"
"L90"
"F84"
"W4"
"F53"
"R90"
"S5"
"F31"
"L180"
"N1"
"L90"
"E2"
"L180"
"W3"
"F98"
"R270"
"S2"
"E5"
"F84"
"S4"
"L90"
"F26"
"E2"
"F66"
"L270"
"E1"
"L180"
"F11"
"E5"
"L90"
"W1"
"F11"
"E3"
"F70"
"E5"
"N3"
"F78"
"W5"
"L270"
"W5"
"N1"
"L90"
"S4"
"F8"
"L90"
"F95"
"L90"
"F99"
"S3"
"F61"
"N2"
"F84"
"S5"
"F3"
"E5"
"R90"
"F33"
"W5"
"S1"
"L90"
"F52"
"E4"
"L90"
"E1"
"N1"
"L270"
"S3"
"W4"
"R180"
"F89"
"R270"
"F10"
"R90"
"N1"
"R180"
"W5"
"N2"
"F78"
"S5"
"F25"
"S4"
"F25"
"N3"
"F29"
"W1"
"F24"
"S4"
"L90"
"S5"
"F17"
"L90"
"S4"
"E2"
"N3"
"F38"
"S4"
"L90"
"F1"
"L90"
"E2"
"F92"
"L90"
"E4"
"S1"
"E1"
"F28"
"N1"
"F46"
"R90"
"N1"
"W4"
"N3"
"E3"
"F90"
"N5"
"L180"
"S1"
"E3"
"F96"
"L90"
"E1"
"R90"
"N5"
"E1"
"F74"
"L180"
"N2"
"L90"
"N1"
"E4"
"R90"
"E1"
"S2"
"F91"
"R90"
"N5"
"E4"
"F9"
"N2"
"E1"
"F13"
"E2"
"S4"
"W1"
"R90"
"S1"
"R90"
"F18"
"L90"
"F12"
"S2"
"F65"
"N2"
"E3"
"F65"
"E1"
"L180"
"E2"
"S4"
"W4"
"F89"
"N4"
"E5"
"L180"
"N4"
"W1"
"F22"
"L90"
"W2"
"S2"
"F6"
"E4"
"F74"
"N2"
"E2"
"S1"
"R90"
"F87"
"W5"
"R90"
"W4"
"R90"
"E4"
"L90"
"N3"
"F68"
"L180"
"N1"
"W1"
"F81"
"R90"
"F95"
"R90"
"R180"
"E5"
"F51"
"F23"
"F74"
"N3"
"F16"
"F64"
"L90"
"W4"
"R90"
"R90"
"W4"
"F97"
"R180"
"N3"
"F79"
"E3"
"L90"
"N2"
"F14"
"S4"
"F41"
"W2"
"L90"
"F54"
"N3"
"E4"
"R90"
"W2"
"R90"
"S4"
"L90"
"L90"
"S4"
"R90"
"E4"
"S3"
"L90"
"F5"
"R90"
"L90"
"W2"
"R90"
"W3"
"N4"
"E5"
"F14"
"E5"
"S4"
"F96"
"S4"
"L90"
"W2"
"F96"
"L90"
"E3"
"L90"
"F4"
"R90"
"F61"
"E2"
"F56"
"E1"
"F100"
"E5"
"R90"
"F54"
"R90"
"E4"
"F2"
"R180"
"S3"
"F8"
"L90"
"W1"
"R90"
"F19"
"W5"
"L90"
"S1"
"L90"
"W5"
"S2"
"F30"
"R90"
"W5"
"F31"
"S5"
"E1"
"N2"
"F100"
"N1"
"F3"
"W3"
"F46"
"R90"
"E2"
"F62"
"L180"
"F90"
"L180"
"S3"
"L90"
"S5"
"F40"
"N4"
"F95"])
(defn abs [n] (max n (- n)))
(defn manhatten-distance [[x y]] (+ (abs x) (abs y)))
(defn parse
[instruction]
[(keyword (first instruction)) (js/parseInt (subs instruction 1) 10)])
(def dir->num {:N 0
:E 90
:S 180
:W 270})
(def num->dir {0 :N
90 :E
180 :S
270 :W})
(defn process-1
[{[x y] :pos dir :dir} [command value]]
(cond
(= command :N) {:pos [x (+ y value)] :dir dir}
(= command :S) {:pos [x (- y value)] :dir dir}
(= command :E) {:pos [(+ x value) y] :dir dir}
(= command :W) {:pos [(- x value) y] :dir dir}
(= command :L) {:pos [x y] :dir (num->dir (mod (+ (dir->num dir) (- 360 value)) 360))}
(= command :R) {:pos [x y] :dir (num->dir (mod (+ (dir->num dir) value) 360))}
(= command :F) {:pos (cond
(= dir :N) [x (+ y value)]
(= dir :S) [x (- y value)]
(= dir :E) [(+ x value) y]
(= dir :W) [(- x value) y]) :dir dir}))
(defn process-2
[{pos :pos [x y] :wp} [command value]]
(cond
(= command :N) {:pos pos :wp [x (+ y value)]}
(= command :S) {:pos pos :wp [x (- y value)]}
(= command :E) {:pos pos :wp [(+ x value) y]}
(= command :W) {:pos pos :wp [(- x value) y]}
(= command :L) {:pos pos :wp (cond
(= 90 value) [(- y) x]
(= 180 value) [(- x) (- y)]
(= 270 value) [y (- x)])}
(= command :R) {:pos pos :wp (cond
(= 90 value) [y (- x)]
(= 180 value) [(- x) (- y)]
(= 270 value) [(- y) x])}
(= command :F) (let [dx (* x value)
dy (* y value)
px (+ (first pos) dx)
py (+ (second pos) dy)]
{:pos [px py] :wp [x y]})))
(def start-1 {:pos [0 0]
:dir :E})
(def end-1 (reduce process-1 start-1 (map parse raw-instructions)))
(println (manhatten-distance (end-1 :pos))) ;; 1645
(def start-2 {:pos [0 0]
:wp [10 1]})
(def end-2 (reduce process-2 start-2 (map parse raw-instructions)))
(println (manhatten-distance (end-2 :pos))) ;; 35292