package main

import (
	"bufio"
	"log"
	"os"
)

// readlines reads lines from stdin.
// it returns them as an array of strings
func readlines() []string {
	lines := []string{}

	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		lines = append(lines, scanner.Text())
	}

	if err := scanner.Err(); err != nil {
		log.Fatal(err)
	}

	return lines
}

// nodeInNodes returns true if node n is in nodes
// X, Y coords and direction must match
func nodeInNodes(n node, nodes []node) bool {
	for _, node := range nodes {
		if n.X == node.X && n.Y == node.Y && n.direction == node.direction {
			return true
		}
	}
	return false
}

// coordInCoords returns true if coords c is in coords
func coordInCoords(c coords, coords []coords) bool {
	for _, coord := range coords {
		if c.X == coord.X && c.Y == coord.Y {
			return true
		}
	}
	return false
}