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  2. Java
  3. Data Structures
  4. Java Dequeue
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Java Dequeue

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327 Discussions

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  • HimaBindhuk
     + 0 comments

    import java.util.*;

    public class Solution { public static void main(String[] args) { Scanner scanner = new Scanner(System.in);

        int numberElements = scanner.nextInt();       // Declare and initialize
    int numberSubgroups = scanner.nextInt();      // Declare and initialize

    Deque<Integer> elementsWindow = new ArrayDeque<>(numberSubgroups); // Declare and initialize
    int maxUniqueValues = 1;
    HashMap<Integer, Integer> frequency = new HashMap<>(numberElements); // Declare and initialize

    for (int i = 0; i < numberElements; i++) {
        int element = scanner.nextInt();
        elementsWindow.addLast(element);

        if (!frequency.containsKey(element)) {
            frequency.put(element, 1);
        } else {
            frequency.put(element, frequency.get(element) + 1);
        }

        if (elementsWindow.size() == numberSubgroups) {
            int numInFrequency = 0;
            for (int value : frequency.values()) {
                if (value > 0) {
                    numInFrequency++;
                }
            }
            maxUniqueValues = Math.max(maxUniqueValues, numInFrequency);

            Integer elementRemoved = elementsWindow.removeFirst();
            int updatedCount = frequency.get(elementRemoved) - 1;
            if (updatedCount == 0) {
                frequency.remove(elementRemoved);
            } else {
                frequency.put(elementRemoved, updatedCount);
            }
        }
    }

    System.out.println(maxUniqueValues);
    scanner.close();
}

    }

  • nuria_ruiz
     + 0 comments

    My version:

     public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    int numberElements = scanner.nextInt();
    int numberSubgroups = scanner.nextInt();
    Deque<Integer> elementsWindow = new ArrayDeque<>(numberSubgroups);
    int maxUniqueValues = 1;
    HashMap<Integer, Integer> frecuencia = new HashMap<>(numberElements);

    for (int i = 0; i < numberElements; i++) {
        int element = scanner.nextInt();
        elementsWindow.addLast(element);
        frecuencia.put(element, frecuencia.getOrDefault(element, 0) + 1);

        if (elementsWindow.size() == numberSubgroups) {
            int numInFrecuencia = frecuencia.size();

            maxUniqueValues = Math.max(maxUniqueValues, numInFrecuencia);
            Integer elementRemoved = elementsWindow.removeFirst();
            int updatedCount = frecuencia.get(elementRemoved) - 1;

            if (updatedCount == 0) {
                frecuencia.remove(elementRemoved);
            } else {
                frecuencia.put(elementRemoved, updatedCount);
            }
        }

    }
    System.out.println(maxUniqueValues);
}

  • carlos_causilv
     + 2 comments
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        Deque<Integer> deque = new ArrayDeque<>();
        HashMap<Integer,Integer> subarray = new HashMap<>();

        int n = in.nextInt();
        int m = in.nextInt();
        int max = 0;
        for (int i = 0; i < n; i++) {
            int num = in.nextInt();
            deque.add(num);


            Integer xt = subarray.get(num);
            if(xt == null) subarray.put(num, 1);
            else subarray.put(num, ++xt);

            if(deque.size() == m){
                if(subarray.size() > max) max = subarray.size();
                int val = deque.poll();
                Integer rem = subarray.get(val);
                if(rem != null){
                    rem--;
                    if(rem==0) subarray.remove(val);
                    else subarray.put(val, rem);
                }
            }
        }



        System.out.println(max);
    }

  • n4m774r_d
     + 0 comments
    import java.util.*;
import java.util.stream.Collectors;
public class test {
        public static void main(String[] args) {
                Scanner in = new Scanner(System.in);
                Deque<Integer> deque = new ArrayDeque<>();
                Map<Integer,Integer> cnt = new HashMap<>();

                int n = in.nextInt();
                int m = in.nextInt();
                int mx = 0;
                in.nextLine();

                List<Integer> A = Arrays.stream(in.nextLine().trim().split("\\s+"))
                                .map(Integer::parseInt).collect(Collectors.toList());

                for (int i = 0; i < n; i++) {
                        deque.addLast(A.get(i));
                        cnt.put(A.get(i),cnt.getOrDefault(A.get(i), 0)+1);
                        if (deque.size()>m) {
                                int rm = deque.removeFirst();
                                cnt.put(rm,cnt.get(rm)-1);
                                if (cnt.get(rm) == 0) cnt.remove(rm);   
                        }
                     if (deque.size()== m) mx = Math.max(mx,cnt.size());
                }
                System.out.println(mx);
        }
}

  • gidni441
     + 0 comments
    import java.util.*;
public class test {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        Deque<Integer> deque = new ArrayDeque<Integer>();
        int n = in.nextInt();
        int m = in.nextInt();
        int max = 0;
        Set<Integer> j = new HashSet<>();
        for (int i = 0; i < n; i++) {
            int num = in.nextInt();
            deque.addLast(num);
            j.add(num);
            if(deque.size()==m){
                int count = j.size();
                if(max<count)  max=count ;
                int target = deque.removeFirst();
                if(!deque.contains(target)) j.remove(target);
            }
        }
        System.out.println(max);
    }
}