src/main/PlayGround.java


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import java.util.PriorityQueue;
import java.util.HashMap;
public class PlayGround {
    static int testPriorityQueue() {
        PriorityQueue<Integer> numbers = new PriorityQueue<>();
        numbers.add(7);
        numbers.add(5);
        numbers.add(8);
        numbers.add(3);
       return numbers.poll();
    }

}