package main

import (
	"bufio"
	"os"

	log "github.com/sirupsen/logrus"
)

// readlines reads lines from stdin.
// returns input 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
}

// inLastMoves checks if next coords exists in past moves
func inLastMoves(last []coords, b coords) bool {
	for _, co := range last {
		if co.X == b.X && co.Y == b.Y {
			return true
		}
	}
	return false
}

// comparePoints returns true if coordinates for two points match
func comparePoints(a, b point) bool {
	return a.X == b.X && a.Y == b.Y
}

// contains returns true if a slice of elements contains a given element
func contains[T comparable](elems []T, v T) bool {
	for _, s := range elems {
		if v == s {
			return true
		}
	}
	return false
}