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void is_reachable(int a, int b, int time_limit)
{
  int dist;
  int result;

  if (a <= b) {
    dist = (b - a);
  } else {
    dist = (a - b);
  };
  if (dist <= (time_limit * 10)) {
    result = 1;
  } else {
    result = 0;
  };

}