package main
import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strings"
)
const (
	down  = 323
	right = 3 * down
	tree  = '#'
)
func main() {
	if err := realMain(); err != nil {
		log.Println(err)
	}
}
func realMain() error {
	m, err := createMap()
	if err != nil {
		return err
	}
	log.Println(countTrees(m))
	return nil
}
func countTrees(m []string) int {
	var (
		count int
		col   int
	)
	for _, line := range m {
		if line[col] == tree {
			count++
		}
		col += 3
	}
	return count
}
func createMap() ([]string, error) {
	fd, err := os.Open("input.txt")
	if err != nil {
		return nil, err
	}
	defer fd.Close()
	var ret []string
	buf := bufio.NewScanner(fd)
	for i := 0; buf.Scan(); i++ {
		line := strings.Builder{}
		for line.Len() < right {
			line.WriteString(buf.Text())
		}
		ret = append(ret, line.String())
	}
	if len(ret) != down {
		return nil, fmt.Errorf("unexpected number of lines")
	}
	return ret, nil
}

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module main
go 1.17