import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class CounterMonitor {
    private Lock lås = new ReentrantLock();
    private Condition ikkeNull = lås.newCondition();
    private int sharedCounter = 0; // Kritisk region

    public void incrementCounter() {
        lås.lock();
        try {
            sharedCounter++;
            ikkeNull.signalAll();
        } finally {
            lås.unlock();
        }
    }

    public void decrementCounter() {
        lås.lock();
        try {
            while (sharedCounter < 1) {
                ikkeNull.await();
            }
            sharedCounter--;
        } catch (InterruptedException e) {
            System.out.println("Womp");
        } finally {
            lås.unlock();
        }
    }

    public int getCounter() {
        lås.lock();
        try {
            return sharedCounter;
        } finally {
            lås.unlock();
        }
    }
}