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|
package part_01
/**
* TRIED:
* 530923
*/
import (
"os"
"strconv"
"strings"
)
const USE_SAMPLE = true
func Solve() {
var content []byte
if USE_SAMPLE {
content, _ = os.ReadFile("../_input/day_03_part_01_sample.txt")
} else {
content, _ = os.ReadFile("../_input/day_03.txt")
}
lines := strings.Split(string(content), "\n")
validNumbers := walkLines(lines)
answer := 0
for _, number := range validNumbers {
answer += number
}
println(answer)
}
func walkLines(lines []string) []int {
var validNumbers []int
for y := 0; y < len(lines); y++ {
line := lines[y]
if line == "" || line == "\n" {
continue
}
// Counts as a symbol...
filteredLine := strings.ReplaceAll(line, "\r", "")
previousWasNumber := false
number := ""
for x := 0; x < len(filteredLine); x++ {
char := filteredLine[x]
_, err := strconv.Atoi(string(char))
isNumeric := err == nil
if isNumeric {
previousWasNumber = true
number += string(char)
continue
}
if !previousWasNumber {
continue
}
isValid := checkValidity(lines, x, y, len(number))
if isValid {
num, _ := strconv.Atoi(number)
validNumbers = append(validNumbers, num)
}
println(number)
previousWasNumber = false
number = ""
}
}
return validNumbers
}
// N = number
// k = numOfDigits + 1
// (x-k,y-1) (x-1,y-1) ( x ,y-1)
// (x-k, y ) N ( x , y )
// (x-k,y+1) (x-1,y+1) ( x ,y+1)
func checkValidity(lines []string, x int, y int, numOfDigits int) bool {
for i := max(y-1, 0); i <= y+1; i++ {
var debugLine string
for j := max(x-(numOfDigits+1), 0); j <= x; j++ {
if lineExists := len(lines) > i; !lineExists {
continue
}
if charExists := len(lines[i]) > j; !charExists {
continue
}
char := rune(lines[i][j])
debugLine += string(char)
if char == '.' {
continue
}
_, err := strconv.Atoi(string(char))
isNumeric := err == nil
if isNumeric {
continue
}
debugLine = "" //nolint:ineffassign // Only used for debugging and needs to be reset
return true
}
}
return false
}
|
