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[2020-12-12] Add solutions for day12

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master
Elis Hirwing 3 years ago
parent 9e61d82146
commit 962a7b810b
Signed by: etu
GPG Key ID: D57EFA625C9A925F
7 changed files with 958 additions and 0 deletions
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2
Makefile
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@ -36,6 +36,8 @@ day11:
go run main.go day11 input
day12:
go run main.go day12 input
day13:
day14:
day15:

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day12/example.txt
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day12/input.txt
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23
day12/parse.go
Unescape Escape View File

@ -0,0 +1,23 @@
package day12
import (
"strconv"
"git.elis.nu/etu/aoc2020/utils"
)
type Instructions struct {
Char string
Arg int
}
var rows []Instructions
func ParseFile(input string) {
// Parse file
for _, line := range utils.GetLinesFromFile("day12/" + input + ".txt") {
arg, _ := strconv.Atoi(string(line[1:]))
rows = append(rows, Instructions{Char: string(line[0]), Arg: arg})
}
}

57
day12/solve1.go
Unescape Escape View File

@ -0,0 +1,57 @@
package day12
import (
"log"
)
type State struct {
Dir, North, East int
}
func Solve1() {
state := State{Dir: 90, North: 0, East: 0}
for _, row := range rows {
switch row.Char {
case "N":
state.North += row.Arg
case "S":
state.North -= row.Arg
case "E":
state.East += row.Arg
case "W":
state.East -= row.Arg
case "R":
state.Dir += row.Arg
case "L":
state.Dir += 360 - row.Arg
case "F":
switch state.Dir % 360 {
case 0:
state.North += row.Arg
case 90:
state.East += row.Arg
case 180:
state.North -= row.Arg
case 270:
state.East -= row.Arg
}
}
}
if state.East < 0 {
state.East *= -1
}
if state.North < 0 {
state.North *= -1
}
log.Printf("2020-12-12.01: Answer: %d\n", state.North+state.East)
}

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day12/solve2.go
Unescape Escape View File

@ -0,0 +1,98 @@
package day12
import (
"log"
)
type Waypoint struct {
North, East int
}
type State2 struct {
Waypoint Waypoint
North, East int
}
func Solve2() {
state := State2{
Waypoint: Waypoint{North: 1, East: 10},
North: 0,
East: 0,
}
for _, row := range rows {
switch row.Char {
case "N":
state.Waypoint.North += row.Arg
case "S":
state.Waypoint.North -= row.Arg
case "E":
state.Waypoint.East += row.Arg
case "W":
state.Waypoint.East -= row.Arg
case "R":
switch row.Arg % 360 {
case 180:
state.Waypoint.East *= -1
state.Waypoint.North *= -1
case 90:
// Turn right a bit
n := state.Waypoint.East * -1
e := state.Waypoint.North
state.Waypoint.North = n
state.Waypoint.East = e
case 270:
// Turn left a bit
n := state.Waypoint.East
e := state.Waypoint.North * -1
state.Waypoint.North = n
state.Waypoint.East = e
}
case "L":
switch row.Arg % 360 {
case 180:
state.Waypoint.East *= -1
state.Waypoint.North *= -1
case 90:
// Turn right a bit
n := state.Waypoint.East
e := state.Waypoint.North * -1
state.Waypoint.North = n
state.Waypoint.East = e
case 270:
// Turn left a bit
n := state.Waypoint.East * -1
e := state.Waypoint.North
state.Waypoint.North = n
state.Waypoint.East = e
}
case "F":
state.North += state.Waypoint.North * row.Arg
state.East += state.Waypoint.East * row.Arg
}
}
if state.East < 0 {
state.East *= -1
}
if state.North < 0 {
state.North *= -1
}
log.Printf("2020-12-12.02: Answer: %d\n", state.North+state.East)
}

4
main.go
Unescape Escape View File

@ -15,6 +15,7 @@ import (
"git.elis.nu/etu/aoc2020/day09"
"git.elis.nu/etu/aoc2020/day10"
"git.elis.nu/etu/aoc2020/day11"
"git.elis.nu/etu/aoc2020/day12"
"git.elis.nu/etu/aoc2020/utils"
)
@ -56,5 +57,8 @@ func main() {
case "day11":
utils.Perf("2020-12-11", day11.ParseFile, day11.Solve1, day11.Solve2)
case "day12":
utils.Perf("2020-12-12", day12.ParseFile, day12.Solve1, day12.Solve2)
}
}

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