advent_of_code_2025/7/solve_1.go

package main

import (
	"bufio"
	"fmt"
	"os"
)

type coord struct {
	x,y int
}

func main() {
	fmt.Println("Advent of Code - Day 7 - Part 1")
	f,_ := os.Open("7/input")
	defer f.Close()
	scanner := bufio.NewScanner(f)
	y := 0
	scanner.Scan()
	y_limit := len(scanner.Text())
	for i := range(scanner.Text()){
		if scanner.Text()[i] == 'S'{
			y = i
		}
	}
	initial_position := coord{0,y}
	x:=1
	var splitters []coord
	for scanner.Scan(){
		line := scanner.Text()
		for i:= range line{
			if line[i] == '^'{
				splitters = append(splitters, coord{x,i})
			}
		}
		x++
	}
	
	limit := coord{x,y_limit}
	res := 0
	count_splits(initial_position, splitters, &res, limit)
	fmt.Println(res)
}

var visited []coord
func is_visited(pos coord) bool {
	for _,v := range visited {
		if pos.x == v.x && pos.y == v.y {
			return true
		} 
	}
	return false
}

func count_splits(pos coord, splitters []coord, acc* int, limit coord){

	if (is_visited(pos)){
		return
	} else {
		visited = append(visited, pos)
	}
	
	if pos.x >= limit.x || pos.y >= limit.y || pos.y < 0 {return}

	for _,s := range splitters {
		if pos.x == s.x && pos.y == s.y {
			*acc = *acc + 1
			count_splits(coord{pos.x,pos.y-1},splitters, acc, limit)
			count_splits(coord{pos.x,pos.y+1},splitters, acc, limit)
			return
		}
	}

	
	count_splits(coord{pos.x+1,pos.y},splitters, acc, limit)
}