14.go

package main

import "fmt"
import "time"

func main() {
	type robot struct {x, y, vx, vy int}

	var xsize, ysize = 101, 103
	var robots []robot
	for {
		var r robot
		if n, _ := fmt.Scanf("p=%d,%d v=%d,%d", &r.x, &r.y, &r.vx, &r.vy); n < 4 { break }
		robots = append(robots, r)
	}
	if len(robots) < 50 { xsize, ysize = 11, 7 } // example board size
	for s := 1; ; s++ {
		for i, _ := range robots {
			var r = &robots[i]
			r.x += r.vx
			if r.x < 0 { r.x += xsize } else if r.x > xsize - 1 { r.x -= xsize }
			r.y += r.vy
			if r.y < 0 { r.y += ysize } else if r.y > ysize - 1 { r.y -= ysize }
		}
		var q1, q2, q3, q4 int
		for _, r := range robots {
			if r.x < xsize / 2 {
				if r.y < ysize / 2 { q1++ } else if r.y > ysize / 2 { q3++ }
			} else if r.x > xsize / 2 {
				if r.y < ysize / 2 { q2++ } else if r.y > ysize / 2 { q4++ }
			}
		}
		if s == 100 {
			fmt.Println(q1 * q2 * q3 * q4)
		}
		if q1 > len(robots) / 2 || q2 > len(robots) / 2 || q3 > len(robots) / 2 || q4 > len(robots) / 2 {
			for y := 0; y < ysize; y++ {
				for x := 0; x < xsize; x++ {
					var occupied = false
					for _, e := range robots {
						if e.x == x && e.y == y { occupied = true; break }
					}
					if occupied { fmt.Print("R") } else { fmt.Print(" ") }
				}
				fmt.Println()
			}
			fmt.Println("second", s)
			time.Sleep(time.Second)
		}
	}
}