// Dart - Problem 3: Smart Water Usage (Fresh version)
void printAlert(int hour, int used, int limit) {
  String base = "Alert: hour " + hour.toString() + " -> " + used.toString() + "L > limit(" + limit.toString() + ")";
  int extra = used - limit;
  print(extra > 40 ? base.toUpperCase() : base.toLowerCase());
}
void main() {
  const int limitPerHour = 100;
  List<int> usage = [62,70,85,93,102,118,67,64,90,96,105,136,78,61,59,95,104,97,73,81,92,100,119,94];
  int total = 0, exceeded = 0;
  for (int h = 0; h < usage.length; h++) {
    int u = usage[h]; total += u;
    if (u > limitPerHour) { exceeded++; printAlert(h+1, u, limitPerHour); }
    else { print("Hour ${h+1}: $u L (within limit)"); }
  }
  double bill = total * 0.005; double finalBill = (total < 200) ? bill * 0.95 : bill;
  print("Final bill: ${finalBill.toStringAsFixed(3)}");
}