2023 Day 11 Complete!

Added a todo file to track changes to my helpers that need
to be propagated through previous days/years
This commit is contained in:
Brian Buller 2023-12-11 08:43:32 -06:00
parent be17b84517
commit 77d53011a1
6 changed files with 284 additions and 11 deletions

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72
2023/day11/main.go Normal file
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@ -0,0 +1,72 @@
package main
import (
"fmt"
h "git.bullercodeworks.com/brian/adventofcode/helpers"
)
func main() {
inp := h.StdinToStringSlice()
part1(inp)
fmt.Println()
part2(inp)
}
func part1(input []string) {
m := h.StringSliceToCoordByteMap(input)
for y := m.Height() - 1; y >= 0; y-- {
if !m.RowContains(y, '#') {
m.InsertRowAfter(y, '.')
}
}
for x := m.Width() - 1; x >= 0; x-- {
if !m.ColContains(x, '#') {
m.InsertColAfter(x, '.')
}
}
galaxies := m.FindAll('#')
var result int
for i := 0; i < len(galaxies); i++ {
for j := i + 1; j < len(galaxies); j++ {
result += galaxies[i].Distance(galaxies[j])
}
}
fmt.Println("# Part 1")
fmt.Println(result)
}
func part2(input []string) {
m := h.StringSliceToCoordByteMap(input)
expansion := 1000000
galaxies := m.FindAll('#')
for y := m.Height() - 1; y >= 0; y-- {
if !m.RowContains(y, '#') {
// For every '#' coordinate on a row _after_ y, add 1000000 to it's y coord
for i := 0; i < len(galaxies); i++ {
if galaxies[i].Y > y {
galaxies[i].Y += (expansion - 1)
}
}
}
}
for x := m.Width() - 1; x >= 0; x-- {
if !m.ColContains(x, '#') {
// For every '#' coordinate on a col _after_ x, add 1000000 to it's x coord
for i := 0; i < len(galaxies); i++ {
if galaxies[i].X > x {
galaxies[i].X += (expansion - 1)
}
}
}
}
var result int
for i := 0; i < len(galaxies); i++ {
for j := i + 1; j < len(galaxies); j++ {
result += galaxies[i].Distance(galaxies[j])
}
}
fmt.Println("# Part 2")
fmt.Println(result)
}

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@ -7,9 +7,7 @@ import (
)
type CoordByteMap struct {
Field map[Coordinate]byte
Height int
Width int
Field map[Coordinate]byte
// The Top-Left-most X/Y
TLX, TLY int
@ -34,8 +32,7 @@ func NewCoordByteMap() CoordByteMap {
func StringSliceToCoordByteMap(input []string) CoordByteMap {
ret := CoordByteMap{
Field: make(map[Coordinate]byte),
Height: len(input),
Field: make(map[Coordinate]byte),
}
for y := range input {
for x := range input[y] {
@ -45,6 +42,13 @@ func StringSliceToCoordByteMap(input []string) CoordByteMap {
return ret
}
func (m *CoordByteMap) Height() int {
return m.BRY - m.TLY
}
func (m *CoordByteMap) Width() int {
return m.BRX - m.TLX
}
func (m *CoordByteMap) ToByteSlices() [][]byte {
var ret [][]byte
for y := m.TLY; y <= m.BRY; y++ {
@ -63,6 +67,54 @@ func (m *CoordByteMap) ContainsCoord(c Coordinate) bool {
c.Y >= m.TLY && c.Y <= m.BRY
}
// RowContains searches a row for a byte
func (m *CoordByteMap) RowContains(row int, b byte) bool {
for x := m.TLX; x <= m.BRX; x++ {
if m.Get(Coordinate{X: x, Y: row}) == b {
return true
}
}
return false
}
// ColContains searches a column for a byte
func (m *CoordByteMap) ColContains(col int, b byte) bool {
for y := m.TLY; y <= m.BRY; y++ {
if m.Get(Coordinate{X: col, Y: y}) == b {
return true
}
}
return false
}
// InsertRowAfter grows the map south, moves all rows after 'row' south
// Then fills the 'row'th row with 'fill'
func (m *CoordByteMap) InsertRowAfter(row int, fill byte) {
m.GrowSouth(1, fill)
for y := m.BRY; y > row; y-- {
for x := m.TLX; x <= m.BRX; x++ {
m.Put(Coordinate{X: x, Y: y}, m.Get(Coordinate{X: x, Y: y - 1}))
}
}
for x := m.TLX; x <= m.BRX; x++ {
m.Put(Coordinate{X: x, Y: row}, fill)
}
}
// InsertColAfter grows the map East, moves all cols after 'col' east
// Then fills the 'col'th column with 'fill'
func (m *CoordByteMap) InsertColAfter(col int, fill byte) {
m.GrowEast(1, fill)
for x := m.BRX; x > col; x-- {
for y := m.TLY; y <= m.BRY; y++ {
m.Put(Coordinate{X: x, Y: y}, m.Get(Coordinate{X: x - 1, Y: y}))
}
}
for y := m.TLY; y <= m.BRY; y++ {
m.Put(Coordinate{X: col, Y: y}, fill)
}
}
// FindFirst searches left to right, top to bottom for the first
// instance of b.
func (m *CoordByteMap) FindFirst(b byte) (Coordinate, error) {
@ -199,12 +251,6 @@ func (m *CoordByteMap) Put(pos Coordinate, val byte) {
m.BRY = pos.Y
}
m.Field[pos] = val
if pos.X+1 > m.Width {
m.Width = m.BRX - m.TLX + 1
}
if pos.Y+1 > m.Height {
m.Height = m.BRY - m.TLY + 1
}
}
func (m *CoordByteMap) Delete(pos Coordinate) {
delete(m.Field, pos)

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@ -23,6 +23,7 @@ const (
FILL_CHAR = "\u2588"
CLEAR_SCREEN = "\033[H\033[2J"
CLEAR_LINE = "\033[1K"
MAX_INT = int(^uint(0) >> 1)
MIN_INT = -MAX_INT - 1

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todo.md Normal file
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# TODO
## CoordByteMap Changes
* [ ] Height/Width are functions now