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day02

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This commit is contained in:
Alan R Evans
2025-12-02 18:23:02 +00:00
parent c82f1c5b30
commit 9613baa5eb
4 changed files with 145 additions and 67 deletions
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59
2025/go/day02/day02.go Normal file
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@@ -0,0 +1,59 @@
package day02
import (
"adventofcode2025/utils"
"fmt"
"strings"
)
func Part1(input string) int {
ranges := strings.Split(input, ",")
count := 0
for _, r := range ranges {
min_s, max_s := strings.Split(r, "-")[0], strings.Split(r, "-")[1]
min := utils.MustAtoi(min_s)
max := utils.MustAtoi(max_s)
for i := min; i <= max; i++ {
s := fmt.Sprintf("%d", i)
if len(s)%2 != 0 {
continue
}
if s[:len(s)/2] != s[len(s)/2:] {
continue
}
count += utils.MustAtoi(s)
}
}
return count
}
func Part2(input string) int {
ranges := strings.Split(input, ",")
count := 0
for _, r := range ranges {
min_s, max_s := strings.Split(r, "-")[0], strings.Split(r, "-")[1]
min := utils.MustAtoi(min_s)
max := utils.MustAtoi(max_s)
for i := min; i <= max; i++ {
s := fmt.Sprintf("%d", i)
for numDigits := 1; numDigits <= len(s)/2; numDigits++ {
if len(s)%numDigits != 0 {
continue
}
found := true
for j := 1; j < len(s)/numDigits; j++ {
if s[0:numDigits] != s[j*numDigits:(j+1)*numDigits] {
found = false
break
}
}
if found {
count += utils.MustAtoi(s)
break
}
}
}
}
return count
}

17
2025/go/day02/day02_test.go Normal file
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@@ -0,0 +1,17 @@
package day02
import (
"testing"
"github.com/stretchr/testify/require"
)
func TestPart1(t *testing.T) {
r := Part1("446443-446449")
require.Equal(t, 446446, r)
}
func TestPart2(t *testing.T) {
r := Part2("222220-222224")
require.Equal(t, 222222, r)
}

1
2025/go/day02/input.txt Normal file
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@@ -0,0 +1 @@
69810572-69955342,3434061167-3434167492,76756725-76781020,49-147,296131-386620,910523-946587,34308309-34358652,64542-127485,640436-659023,25-45,35313993-35393518,753722181-753795479,1544-9792,256-647,444628-483065,5863911-6054673,6969623908-6969778569,658-1220,12631-63767,670238-830345,1-18,214165106-214245544,3309229-3355697

9
2025/go/main.go
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@@ -9,6 +9,7 @@ import (
// "strings"
// "time"
"adventofcode2025/day01"
"adventofcode2025/day02"
"adventofcode2025/utils"
)
@@ -22,9 +23,9 @@ func main() {
case 1:
fmt.Printf("part 1: %d\n", day01.Part1(utils.Readfile(d)))
fmt.Printf("part 2: %d\n", day01.Part2(utils.Readfile(d)))
// case 2:
// fmt.Printf("part 1: %d\n", day02.Part1(utils.Readfile(d)))
// fmt.Printf("part 2: %d\n", day02.Part2(utils.Readfile(d)))
case 2:
fmt.Printf("part 1: %d\n", day02.Part1(utils.Readfile(d)))
fmt.Printf("part 2: %d\n", day02.Part2(utils.Readfile(d)))
// case 3:
// fmt.Printf("part 1: %d\n", day03.Part1(utils.Readfile(d)))
// fmt.Printf("part 2: %d\n", day03.Part2(utils.Readfile(d)))
@@ -97,7 +98,7 @@ func main() {
// Reads day from os.Args.
func day() int {
latest := 0
latest := 1
if len(os.Args) == 1 {
return latest
}