I also used Go - my solution for part 1 was essentially identical to yours. I went a different route for part 2 that I think ended up being simpler though.
I just prepended do() and don't() to the original regex with a |, that way it captured all 3 in order and I just looped through all the matches once and toggled the isEnabled flag accordingly.
Always interesting to see how other people tackle the same problem!
Part 2 Code
funcpart2() {
filePath := "input.txt"
file, _ := os.Open(filePath)
defer file.Close()
pattern := regexp.MustCompile(`do\(\)|don't\(\)|mul\((\d{1,3}),(\d{1,3})\)`)
productSum := 0
isEnabled := true
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
matches := pattern.FindAllStringSubmatch(line, -1)
for _, match := range matches {
if match[0] == "do()" {
isEnabled = true
} elseif match[0] == "don't()" {
isEnabled = false
} elseif isEnabled && len(match) == 3 {
n, _ := strconv.Atoi(match[1])
m, _ := strconv.Atoi(match[2])
productSum += n * m
}
}
}
fmt.Println("Total: ", productSum)
}
I also used Go - my solution for part 1 was essentially identical to yours. I went a different route for part 2 that I think ended up being simpler though.
I just prepended
do()anddon't()to the original regex with a|, that way it captured all 3 in order and I just looped through all the matches once and toggled theisEnabledflag accordingly.Always interesting to see how other people tackle the same problem!
Part 2 Code
func part2() { filePath := "input.txt" file, _ := os.Open(filePath) defer file.Close() pattern := regexp.MustCompile(`do\(\)|don't\(\)|mul\((\d{1,3}),(\d{1,3})\)`) productSum := 0 isEnabled := true scanner := bufio.NewScanner(file) for scanner.Scan() { line := scanner.Text() matches := pattern.FindAllStringSubmatch(line, -1) for _, match := range matches { if match[0] == "do()" { isEnabled = true } else if match[0] == "don't()" { isEnabled = false } else if isEnabled && len(match) == 3 { n, _ := strconv.Atoi(match[1]) m, _ := strconv.Atoi(match[2]) productSum += n * m } } } fmt.Println("Total: ", productSum) }