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day14, too slow. need memo?

This commit is contained in:
efim 2023-12-14 11:47:03 +00:00
parent fde1415f34
commit 709f4c0532
2 changed files with 157 additions and 14 deletions
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71
day14/dayFourteen.go
View File

@ -2,6 +2,7 @@ package day14
import ( import (
"fmt" "fmt"
"log"
"os" "os"
"strings" "strings"
) )
@ -13,8 +14,16 @@ func Run() int {
fmt.Println(field.String()) fmt.Println(field.String())
// fmt.Printf("> lines for field %+v\n", field.UpIndices()) // fmt.Printf("> lines for field %+v\n", field.UpIndices())
field.MoveUp(field.Height()) // field.Move(field.Height(), field.UpIndices())
fmt.Println(field.String()) cycles := 1000000000
for i := 0; i < cycles; i++ {
field.DoSpinCycle()
// fmt.Println(field.String())
if i % 100000 == 0 {
log.Print("done ", i, " cycles")
}
}
// north rock load // north rock load
return field.NorthLoad() return field.NorthLoad()
@ -28,10 +37,10 @@ type Platform struct {
Rocks [][]rune Rocks [][]rune
} }
func (p *Platform)Height() int { func (p *Platform) Height() int {
return len(p.Rocks) return len(p.Rocks)
} }
func (p *Platform)Width() int { func (p *Platform) Width() int {
return len(p.Rocks[0]) return len(p.Rocks[0])
} }
@ -64,10 +73,11 @@ func (p *Platform) String() string {
return text return text
} }
type Coord struct { Row, Col int } type Coord struct{ Row, Col int }
// indices for moving UP, from down to up
func (p *Platform) UpIndices() [][]Coord { func (p *Platform) UpIndices() [][]Coord {
lines := make([][]Coord,0) lines := make([][]Coord, 0)
for col := 0; col < p.Width(); col++ { for col := 0; col < p.Width(); col++ {
line := make([]Coord, 0) line := make([]Coord, 0)
for row := 0; row < p.Height(); row++ { for row := 0; row < p.Height(); row++ {
@ -78,8 +88,9 @@ func (p *Platform) UpIndices() [][]Coord {
return lines return lines
} }
// indices for moving DOWN, from up to down
func (p *Platform) DownIndices() [][]Coord { func (p *Platform) DownIndices() [][]Coord {
lines := make([][]Coord,0) lines := make([][]Coord, 0)
for col := 0; col < p.Width(); col++ { for col := 0; col < p.Width(); col++ {
line := make([]Coord, 0) line := make([]Coord, 0)
for row := p.Height() - 1; row >= 0; row-- { for row := p.Height() - 1; row >= 0; row-- {
@ -90,16 +101,40 @@ func (p *Platform) DownIndices() [][]Coord {
return lines return lines
} }
func (p *Platform)SymbAt(coord Coord) rune { // indices for moving RIGHT from right to left
func (p *Platform) RightIndices() [][]Coord {
lines := make([][]Coord, 0)
for row := 0; row < p.Height(); row++ {
line := make([]Coord, 0)
for col := p.Width() - 1; col >= 0; col-- {
line = append(line, Coord{Row: row, Col: col})
}
lines = append(lines, line)
}
return lines
}
// indices for moving LEFT, from left to right
func (p *Platform) LeftIndices() [][]Coord {
lines := make([][]Coord, 0)
for row := 0; row < p.Height(); row++ {
line := make([]Coord, 0)
for col := 0; col < p.Width(); col++ {
line = append(line, Coord{Row: row, Col: col})
}
lines = append(lines, line)
}
return lines
}
func (p *Platform) SymbAt(coord Coord) rune {
return p.Rocks[coord.Row][coord.Col] return p.Rocks[coord.Row][coord.Col]
} }
func (p *Platform)SetSymbAt(coord Coord, symb rune) { func (p *Platform) SetSymbAt(coord Coord, symb rune) {
p.Rocks[coord.Row][coord.Col] = symb p.Rocks[coord.Row][coord.Col] = symb
} }
func (p *Platform) MoveUp(n int) { func (p *Platform) Move(n int, lines [][]Coord) {
lines := p.UpIndices()
for _, line := range lines { for _, line := range lines {
moveSize := 0 moveSize := 0
for i, coord := range line { for i, coord := range line {
@ -119,7 +154,7 @@ func (p *Platform) MoveUp(n int) {
// get coord for moveSize back. and set that to 'o' // get coord for moveSize back. and set that to 'o'
// and set current to '.' // and set current to '.'
// panic if that place is not '.' i guess // panic if that place is not '.' i guess
moveTo := line[i - moveSize] moveTo := line[i-moveSize]
symbAtTarget := p.SymbAt(moveTo) symbAtTarget := p.SymbAt(moveTo)
if symbAtTarget != Space { if symbAtTarget != Space {
panic(fmt.Sprintf("attempting to move %+v to %+v, target symbol is %s, not '.'", panic(fmt.Sprintf("attempting to move %+v to %+v, target symbol is %s, not '.'",
@ -132,7 +167,7 @@ func (p *Platform) MoveUp(n int) {
} }
} }
func (p *Platform)NorthLoad() int { func (p *Platform) NorthLoad() int {
total := 0 total := 0
height := p.Height() height := p.Height()
for i, row := range p.Rocks { for i, row := range p.Rocks {
@ -144,3 +179,11 @@ func (p *Platform)NorthLoad() int {
} }
return total return total
} }
func (p *Platform) DoSpinCycle() {
// north, west, south, east - till the end
p.Move(p.Height(), p.UpIndices())
p.Move(p.Width(), p.LeftIndices())
p.Move(p.Height(), p.DownIndices())
p.Move(p.Width(), p.RightIndices())
}

100
day14/input Normal file
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