private int findIndex2(String rule) {
rule = rule.trim();
if (rule.startsWith("m")) {
int n = Integer.parseInt(rule.substring(1));
return -1 * Math.abs(n);
}
return Integer.parseInt(rule);
}
protected int distanceTo(int[] p1, int[] p2) {
return Math.abs(p1[0] - p2[0]) + Math.abs(p1[1] - p2[1]);
}