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day21; a little bit hacky, but working

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This commit is contained in:
Stefan Harmuth 2021-10-26 23:48:48 +02:00
parent 91dcccf17f
commit e9ee54b0d9
4 changed files with 226 additions and 1 deletions
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114
day21/day.go Normal file
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@ -0,0 +1,114 @@
package day21
import (
"bytes"
"fmt"
"strconv"
"strings"
"tools"
)
var revIndex = map[int]int{
0: 1,
1: 1,
2: 6,
3: 2,
4: 7,
5: 3,
6: 8,
7: 4,
}
func scramble(s string, instr []string, reverse bool) string {
sb := []byte(s)
for _, inst := range instr {
parts := strings.Split(inst, " ")
if parts[0] == "swap" && parts[1] == "position" {
x, _ := strconv.Atoi(parts[2])
y, _ := strconv.Atoi(parts[5])
sb[x], sb[y] = sb[y], sb[x]
} else if parts[0] == "swap" && parts[1] == "letter" {
x := bytes.Index(sb, []byte(parts[2]))
y := bytes.Index(sb, []byte(parts[5]))
sb[x], sb[y] = sb[y], sb[x]
} else if parts[0] == "rotate" && parts[1] == "left" {
x, _ := strconv.Atoi(parts[2])
if reverse {
sb = append(sb[len(sb)-(x%len(sb)):], sb[:len(sb)-(x%len(sb))]...)
} else {
sb = append(sb[x%len(sb):], sb[:x%len(sb)]...)
}
} else if parts[0] == "rotate" && parts[1] == "right" {
x, _ := strconv.Atoi(parts[2])
if reverse {
sb = append(sb[x%len(sb):], sb[:x%len(sb)]...)
} else {
sb = append(sb[len(sb)-(x%len(sb)):], sb[:len(sb)-(x%len(sb))]...)
}
} else if parts[0] == "rotate" && parts[1] == "based" {
var x int
if reverse {
x = bytes.Index(sb, []byte(parts[6]))
x = revIndex[x]
sb = append(sb[x%len(sb):], sb[:x%len(sb)]...)
} else {
x = bytes.Index(sb, []byte(parts[6]))
if x >= 4 {
x++
}
x++
sb = append(sb[len(sb)-(x%len(sb)):], sb[:len(sb)-(x%len(sb))]...)
}
} else if parts[0] == "reverse" && parts[1] == "positions" {
x, _ := strconv.Atoi(parts[2])
y, _ := strconv.Atoi(parts[4])
var ns []byte
for i := 0; i < x; i++ {
ns = append(ns, sb[i])
}
for i := y; i >= x; i-- {
ns = append(ns, sb[i])
}
sb = append(ns, sb[y+1:]...)
} else if parts[0] == "move" && parts[1] == "position" {
x, _ := strconv.Atoi(parts[2])
y, _ := strconv.Atoi(parts[5])
if reverse {
c := sb[y]
sb = append(sb[:y], sb[y+1:]...)
sb = append(sb[:x+1], sb[x:]...)
sb[x] = c
} else {
c := sb[x]
sb = append(sb[:x], sb[x+1:]...)
sb = append(sb[:y+1], sb[y:]...)
sb[y] = c
}
} else {
fmt.Println("ERROR: unknown instruction:", inst)
}
}
return string(sb)
}
func Part1(puzzle tools.AoCPuzzle) interface{} {
inp := puzzle.GetInputArray()
startString := inp[0]
password := scramble(startString, inp[1:], false)
return password
}
func Part2(puzzle tools.AoCPuzzle) interface{} {
inp := puzzle.GetInputArray()
var rinp []string
for x := len(inp) - 1; x > 0; x-- {
rinp = append(rinp, inp[x])
}
startString := "fbgdceah"
//startString := "gfdhebac"
password := scramble(startString, rinp, true)
return password
}

101
inputs/21 Normal file
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@ -0,0 +1,101 @@
abcdefgh
reverse positions 1 through 6
rotate based on position of letter a
swap position 4 with position 1
reverse positions 1 through 5
move position 5 to position 7
swap position 4 with position 0
swap position 4 with position 6
rotate based on position of letter a
swap position 0 with position 2
move position 5 to position 2
move position 7 to position 1
swap letter d with letter c
swap position 5 with position 3
reverse positions 3 through 7
rotate based on position of letter d
swap position 7 with position 5
rotate based on position of letter f
swap position 4 with position 1
swap position 3 with position 6
reverse positions 4 through 7
rotate based on position of letter c
move position 0 to position 5
swap position 7 with position 4
rotate based on position of letter f
reverse positions 1 through 3
move position 5 to position 3
rotate based on position of letter g
reverse positions 2 through 5
rotate right 0 steps
rotate left 0 steps
swap letter f with letter b
rotate based on position of letter h
move position 1 to position 3
reverse positions 3 through 6
rotate based on position of letter h
swap position 4 with position 3
swap letter b with letter h
swap letter a with letter h
reverse positions 1 through 6
swap position 3 with position 6
swap letter e with letter d
swap letter e with letter h
swap position 1 with position 5
rotate based on position of letter a
reverse positions 4 through 5
swap position 0 with position 4
reverse positions 0 through 3
move position 7 to position 2
swap letter e with letter c
swap position 3 with position 4
rotate left 3 steps
rotate left 7 steps
rotate based on position of letter e
reverse positions 5 through 6
move position 1 to position 5
move position 1 to position 2
rotate left 1 step
move position 7 to position 6
rotate left 0 steps
reverse positions 5 through 6
reverse positions 3 through 7
swap letter d with letter e
rotate right 3 steps
swap position 2 with position 1
swap position 5 with position 7
swap letter h with letter d
swap letter c with letter d
rotate based on position of letter d
swap letter d with letter g
reverse positions 0 through 1
rotate right 0 steps
swap position 2 with position 3
rotate left 4 steps
rotate left 5 steps
move position 7 to position 0
rotate right 1 step
swap letter g with letter f
rotate based on position of letter a
rotate based on position of letter b
swap letter g with letter e
rotate right 4 steps
rotate based on position of letter h
reverse positions 3 through 5
swap letter h with letter e
swap letter g with letter a
rotate based on position of letter c
reverse positions 0 through 4
rotate based on position of letter e
reverse positions 4 through 7
rotate left 4 steps
swap position 0 with position 6
reverse positions 1 through 6
rotate left 2 steps
swap position 5 with position 3
swap letter b with letter d
swap letter b with letter d
rotate based on position of letter d
rotate based on position of letter c
rotate based on position of letter h
move position 4 to position 7

9
inputs/21_test Normal file
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@ -0,0 +1,9 @@
abcde
swap position 4 with position 0
swap letter d with letter b
reverse positions 0 through 4
rotate left 1 step
move position 1 to position 4
move position 3 to position 0
rotate based on position of letter b
rotate based on position of letter d

3
main.go
View File

@ -20,6 +20,7 @@ import (
"aoc2016/day18"
"aoc2016/day19"
"aoc2016/day20"
"aoc2016/day21"
"aoc2016/day23"
"aoc2016/day24"
"flag"
@ -59,7 +60,7 @@ func initDayFunctions() {
18: {1: day18.Part1, 2: day18.Part2},
19: {1: day19.Part1, 2: day19.Part2},
20: {1: day20.Part1, 2: day20.Part2},
// 21: {1: day21.Part1, 2: day21.Part2},
21: {1: day21.Part1, 2: day21.Part2},
// 22: {1: day22.Part1, 2: day22.Part2},
23: {1: day23.Part1, 2: day23.Part2},
24: {1: day24.Part1, 2: day24.Part2},