package main
import (
	"bufio"
	"log"
	"os"
)
func main() {
	if err := myMain(); err != nil {
		log.Println(err)
	}
}
func myMain() error {
	lines, err := parseInput("input.txt")
	if err != nil {
		return err
	}
	log.Println(solveFirst(lines))
	return nil
}
func solveFirst(lines []string) int {
	corrValue := map[rune]int{
		')': 3,
		']': 57,
		'}': 1197,
		'>': 25137,
	}
	var ret int
	for _, line := range lines {
		if end, ok := isCorrupted(line); ok {
			ret += corrValue[end]
		}
	}
	return ret
}
func parseInput(fileName string) ([]string, error) {
	var ret []string
	fd, err := os.Open(fileName)
	if err != nil {
		return ret, err
	}
	defer fd.Close()
	buf := bufio.NewScanner(fd)
	for buf.Scan() {
		ret = append(ret, buf.Text())
	}
	return ret, nil
}
func isCorrupted(input string) (rune, bool) {
	var brackets string
	for _, b := range input {
		switch b {
		case '(', '[', '{', '<':
			brackets += string(b)
		case ')':
			if len(brackets) == 0 || brackets[len(brackets)-1] != '(' {
				return b, true
			}
			brackets = brackets[:len(brackets)-1]
		case ']':
			if len(brackets) == 0 || brackets[len(brackets)-1] != '[' {
				return b, true
			}
			brackets = brackets[:len(brackets)-1]
		case '}':
			if len(brackets) == 0 || brackets[len(brackets)-1] != '{' {
				return b, true
			}
			brackets = brackets[:len(brackets)-1]
		case '>':
			if len(brackets) == 0 || brackets[len(brackets)-1] != '<' {
				return b, true
			}
			brackets = brackets[:len(brackets)-1]
		}
	}
	return ' ', false
}

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module main
go 1.17