Poj Solution 2632

```http://poj.org/problem?id=2632

import java.util.Scanner;

enum Direction {
N, S, W, E
}

class Robot {
int id;
int x;
int y;
Direction direction;

public Robot(int i, int x, int y, String direction) {
this.id = i;
this.x = x;
this.y = y;
if (direction.equalsIgnoreCase("N"))
this.direction = Direction.N;
else if (direction.equalsIgnoreCase("S"))
this.direction = Direction.S;
else if (direction.equalsIgnoreCase("W"))
this.direction = Direction.W;
else if (direction.equalsIgnoreCase("E"))
this.direction = Direction.E;
}

public void move(String command) {
if (command.equalsIgnoreCase("F")) {
switch (this.direction) {
case N:
this.y++;
break;
case S:
this.y--;
break;
case W:
this.x--;
break;
case E:
this.x++;
break;
}
} else {
this.rotate(command);
}
}

public void rotate(String s) {
if (s.equalsIgnoreCase("L")) {
switch (this.direction) {
case N:
this.direction = Direction.W;
break;
case S:
this.direction = Direction.E;
break;
case W:
this.direction = Direction.S;
break;
case E:
this.direction = Direction.N;
break;
}
} else {
switch (this.direction) {
case N:
this.direction = Direction.E;
break;
case S:
this.direction = Direction.W;
break;
case W:
this.direction = Direction.N;
break;
case E:
this.direction = Direction.S;
break;
}
}
}
}

public class Main {

public static String collision(Robot[] robots, Robot r, int x_dim, int y_dim) {
int num = robots.length;
if (r.x <= 0 || r.x > x_dim || r.y <= 0 || r.y > y_dim) {
return "Robot " + r.id + " crashes into the wall";
}
for (int i = 0; i < num; i++) {
if (r.x == robots[i].x && r.y == robots[i].y
&& r.id != robots[i].id) {
return "Robot " + r.id + " crashes into " + "robot "
+ robots[i].id;
}
}
return "OK";
}

public static void main(String[] args) {

Scanner in = new Scanner(System.in);
int rounds = in.nextInt();
for (int i = 0; i < rounds; i++) {
int x_dimension = in.nextInt();
int y_dimension = in.nextInt();
int num_robots = in.nextInt();
String response = "OK", temp;
Robot robots[] = new Robot[num_robots];
int num_ins = in.nextInt();
for (int j = 1; j < num_robots + 1; j++) {
robots[j - 1] = new Robot(j, in.nextInt(), in.nextInt(), in
.next());
}
for (int k = 0; k < num_ins; k++) {
int r_id = in.nextInt();
String command = in.next();
int num_iteration = in.nextInt();
Robot robot = robots[r_id - 1];
for (int m = 0; m < num_iteration; m++) {
robot.move(command);
temp = collision(robots, robot, x_dimension, y_dimension);
if (response.startsWith("O") && !temp.startsWith("O"))
response = temp;
}
}
System.out.println(response);
}
}

}

```
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