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[2020-12-03] Add solutions for day03

master
Elis Hirwing 2020-12-02 19:51:01 +01:00
parent e0674428d0
commit d83ed5dd0b
Signed by: etu
GPG Key ID: D57EFA625C9A925F
8 changed files with 396 additions and 0 deletions
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2
Makefile
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@ -9,6 +9,8 @@ day02:
go run main.go day02 input
day03:
go run main.go day03 input
day04:
day05:
day06:

11
day03/example.txt Normal file
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day03/input.txt Normal file
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day03/lib.go Normal file
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package day03
func checkSlope(rows [][]byte, ySpeed int, xSpeed int) int {
rowLen := len(rows[0])
key := 0
counter := 0
for i := 0; i < len(rows); i += ySpeed {
// Check if this column on this row is a tree ASCII Char 35 (#)
// Use modulo to "wrap" the map.
if rows[i][key%rowLen] == 35 {
counter++
}
// Step right
key += xSpeed
}
return counter
}

14
day03/parse.go Normal file
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@ -0,0 +1,14 @@
package day03
import (
"git.elis.nu/etu/aoc2020/utils"
)
var rows [][]byte
func ParseFile(input string) {
// Parse file
for _, line := range utils.GetLinesFromFile("day03/" + input + ".txt") {
rows = append(rows, []byte(line))
}
}

9
day03/solve1.go Normal file
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@ -0,0 +1,9 @@
package day03
import "log"
func Solve1() {
trees := checkSlope(rows, 1, 3)
log.Println("2020-12-03.01: Answer:", trees)
}

13
day03/solve2.go Normal file
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@ -0,0 +1,13 @@
package day03
import "log"
func Solve2() {
trees := checkSlope(rows, 1, 1) *
checkSlope(rows, 1, 3) *
checkSlope(rows, 1, 5) *
checkSlope(rows, 1, 7) *
checkSlope(rows, 2, 1)
log.Println("2020-12-03.02: Answer:", trees)
}

4
main.go
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@ -6,6 +6,7 @@ import (
"git.elis.nu/etu/aoc2020/day01"
"git.elis.nu/etu/aoc2020/day02"
"git.elis.nu/etu/aoc2020/day03"
"git.elis.nu/etu/aoc2020/utils"
)
@ -20,5 +21,8 @@ func main() {
case "day02":
utils.Perf("2020-12-02", day02.ParseFile, day02.Solve1, day02.Solve2)
case "day03":
utils.Perf("2020-12-03", day03.ParseFile, day03.Solve1, day03.Solve2)
}
}