package main

import (
  "bufio"
  "fmt"
  "os"
  "aoc2022/day09/common"
)

func main() {
  movements := common.Parse(*bufio.NewScanner(os.Stdin))
  grid := common.NewGrid(10)
  visited := make(map[common.Position]struct{})

  for _, movement := range movements {
    tailVisited := grid.Move(movement)
    for position := range tailVisited {
      visited[position] = struct{}{}
    }
  }

  fmt.Println(len(visited))
}