alan/adventofcode
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

day02

Browse Source
This commit is contained in:
Alan R Evans
2025-12-04 11:53:14 +00:00
parent 9c2e2c68dd
commit bcd7daea9e
2 changed files with 130 additions and 67 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
2025/go/day02/day02.go Normal file
View File

@@ -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
continue
}
}
if found {
count += utils.MustAtoi(s)
break
}
}
}
}
return count
}

24
2025/go/main.go
View File

@@ -9,6 +9,10 @@ import (
// "strings"
// "time"
"adventofcode2025/day01"
"adventofcode2025/day02"
"adventofcode2025/day03"
"adventofcode2025/day04"
"adventofcode2025/utils"
)
@@ -22,15 +26,15 @@ 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 3:
// fmt.Printf("part 1: %d\n", day03.Part1(utils.Readfile(d)))
// fmt.Printf("part 2: %d\n", day03.Part2(utils.Readfile(d)))
// case 4:
// fmt.Printf("part 1: %d\n", day04.Part1(utils.Readfile(d)))
// fmt.Printf("part 2: %d\n", day04.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)))
case 4:
fmt.Printf("part 1: %d\n", day04.Part1(utils.Readfile(d)))
fmt.Printf("part 2: %d\n", day04.Part2(utils.Readfile(d)))
// case 6:
// fmt.Printf("part 1: %d\n", day06.Part1(utils.Readfile(d)))
// fmt.Printf("part 2: %d\n", day06.Part2(utils.Readfile(d)))
@@ -97,7 +101,7 @@ func main() {
// Reads day from os.Args.
func day() int {
latest := 0
latest := 3
if len(os.Args) == 1 {
return latest
}