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base: Kharec/advent-of-code:f8d8916b60ee0073feaf39e60046d54be253ebb7
Kharec/advent-of-code:main
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compare: Kharec/advent-of-code:3f795a451d73b5de521146e1e4aaa90608102700
Kharec/advent-of-code:main
4 Commits
f8d8916b60 ... 3f795a451d
Author SHA1 Message Date
Kharec 3f795a451d test: add unit tests 2025-11-24 21:35:28 +01:00
Kharec c56c2aa449 feat: add main code 2025-11-24 21:35:22 +01:00
Kharec 19ea2cd1f6 feat: add input 2025-11-24 21:35:19 +01:00
Kharec 8594cd44d3 go: init 2021/day02 package 2025-11-24 21:35:14 +01:00
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2021/day02/go.mod
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module 2021/day02
go 1.25.4
2021/day02/input.txt
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forward 9
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2021/day02/main.go
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package main
import (
"fmt"
"log"
"os"
"strconv"
"strings"
)
func parseInput(file string) []string {
content, err := os.ReadFile(file)
if err != nil {
log.Fatalf("Failed to read input file: %v", err)
}
return strings.Split(string(content), "\n")
}
func PartOne(data []string) int {
horizontal := 0
depth := 0
for _, line := range data {
parts := strings.Split(line, " ")
direction := parts[0]
amount, _ := strconv.Atoi(parts[1])
switch direction {
case "forward":
horizontal += amount
case "down":
depth += amount
case "up":
depth -= amount
}
}
return horizontal * depth
}
func PartTwo(data []string) int {
horizontal := 0
depth := 0
aim := 0
for _, line := range data {
parts := strings.Split(line, " ")
direction := parts[0]
amount, _ := strconv.Atoi(parts[1])
switch direction {
case "forward":
horizontal += amount
depth += aim * amount
case "down":
aim += amount
case "up":
aim -= amount
}
}
return horizontal * depth
}
func main() {
data := parseInput("input.txt")
fmt.Println("Part 1:", PartOne(data))
fmt.Println("Part 2:", PartTwo(data))
}
2021/day02/main_test.go
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package main
import "testing"
var testInput = []string{
"forward 5",
"down 5",
"forward 8",
"up 3",
"down 8",
"forward 2",
}
func TestPartOne(t *testing.T) {
expected := 150
got := PartOne(testInput)
if got != expected {
t.Errorf("PartOne() = %d, want %d", got, expected)
}
}
func TestPartTwo(t *testing.T) {
expected := 900
got := PartTwo(testInput)
if got != expected {
t.Errorf("PartTwo() = %d, want %d", got, expected)
}
}