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2020 Day 3 Done!

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Brian Buller 2020-12-03 08:16:00 -06:00
parent 0642c298f3
commit 37a935d038
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2020/day03/main.go Normal file
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package main
import (
"fmt"
h "git.bullercodeworks.com/brian/adventofcode/helpers"
)
func main() {
inp := h.StdinToStringSlice()
total := 1
for _, slope := range []h.Coordinate{
{X: 1, Y: 1},
{X: 3, Y: 1},
{X: 5, Y: 1},
{X: 7, Y: 1},
{X: 1, Y: 2},
} {
field := h.StringSliceToCoordByteMap(inp)
val := countTrees(field, slope.X, slope.Y)
total = total * val
fmt.Println(slope.X, slope.Y, ":", val, "Trees")
}
fmt.Println("Total:", total)
}
func countTrees(field h.CoordByteMap, x, y int) int {
trees := 0
pos := h.Coordinate{X: x, Y: y}
for pos.Y < field.Height {
if pos.X > field.Width {
pos.X = pos.X - field.Width - 1
}
if field.Get(pos) == '#' {
trees++
field.Put(pos, 'X')
} else {
field.Put(pos, 'O')
}
pos.Y = pos.Y + y
pos.X = pos.X + x
}
return trees
}

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..##.......
#...#...#..
.#....#..#.
..#.#...#.#
.#...##..#.
..#.##.....
.#.#.#....#
.#........#
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#...##....#
.#..#...#.#

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helpers/coordinateByteMap.go Normal file
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package aoc
type CoordByteMap struct {
Field map[Coordinate]byte
Height int
Width int
}
func StringSliceToCoordByteMap(input []string) CoordByteMap {
ret := CoordByteMap{
Field: make(map[Coordinate]byte),
Height: len(input),
Width: 0,
}
for y := range input {
for x := range input[y] {
ret.Field[Coordinate{X: x, Y: y}] = input[y][x]
if x > ret.Width {
ret.Width = x
}
}
}
return ret
}
func (m *CoordByteMap) Get(pos Coordinate) byte {
if pos.X <= m.Width && pos.Y <= m.Height {
return m.Field[pos]
}
return 0
}
func (m *CoordByteMap) Put(pos Coordinate, val byte) {
m.Field[pos] = val
}
func (m CoordByteMap) String() string {
var ret string
for y := 0; y <= m.Height; y++ {
for x := 0; x <= m.Width; x++ {
ret = ret + string(m.Field[Coordinate{X: x, Y: y}])
}
ret = ret + "\n"
}
return ret
}

4
helpers/helpers.go
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@ -101,6 +101,10 @@ func StdinToStringSlice() []string {
return input return input
} }
func StdinToCoordMap() CoordByteMap {
return StringSliceToCoordByteMap(StdinToStringSlice())
}
func Atoi(i string) int { func Atoi(i string) int {
var ret int var ret int
var err error var err error