2.Lab2.1 DLL Divide by parity (Solved)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class DLLNode<E extends Number> {
    protected E element;
    protected DLLNode<E> pred, succ;

    public DLLNode(E elem, DLLNode<E> pred, DLLNode<E> succ) {
        this.element = elem;
        this.pred = pred;
        this.succ = succ;
    }

    @Override
    public String toString() {
        return element.toString();
    }
}

class DLL<E extends Number> {
    private DLLNode<E> first, last;

    public DLL() {
        this.first = null;
        this.last = null;
    }

    @Override
    public String toString() {
        if (first != null) {
            DLLNode<E> temp = first;
            StringBuffer sb = new StringBuffer();
            sb.append(temp.toString() + " ");
            while (temp.succ != null) {
                temp = temp.succ;
                sb.append(temp + " ");
            }
            sb.setLength(sb.length() - 1);
            return sb.toString();
        } else {
            return "";
        }
    }

    public void insertFirst(E o) {
        DLLNode<E> ins = new DLLNode<E>(o, null, first);
        if (first == null)
            last = ins;
        else
            first.pred = ins;
        first = ins;
    }

    public void insertLast(E o) {
        if (first == null) {
            insertFirst(o);
        } else {
            DLLNode<E> ins = new DLLNode<E>(o, last, null);
            last.succ = ins;
            last = ins;
        }
    }

    public E deleteFirst() {
        if (first != null) {
            DLLNode<E> tmp = first;
            first = first.succ;
            first.pred = null;
            if (first == null)
                last = null;
            return tmp.element;
        }
        return null;
    }

    public E deleteLast() {
        if (first != null) {
            if (first.succ == null) {
                return deleteFirst();
            } else {
                DLLNode<E> tmp = last;
                last = last.pred;
                last.succ = null;
                return tmp.element;
            }
        }
        return null;
    }

    public void insertAfter(E o, DLLNode<E> after) {
        if (after == last) {
            insertLast(o);
            return;
        }
        DLLNode<E> ins = new DLLNode<E>(o, after, after.succ);
        after.succ.pred = ins;
        after.succ = ins;
    }

    public void insertBefore(E o, DLLNode<E> before) {
        if (before == first) {
            insertFirst(o);
            return;
        }
        DLLNode<E> ins = new DLLNode<E>(o, before.pred, before);
        before.pred.succ = ins;
        before.pred = ins;
    }

    public E delete(DLLNode<E> node) {
        if (node == first) {
            deleteFirst();
            return node.element;
        }
        if (node == last) {
            deleteLast();
            return node.element;
        }
        node.pred.succ = node.succ;
        node.succ.pred = node.pred;
        return node.element;
    }

    public void split(DLL<Integer> original, DLL<Integer> odds, DLL<Integer> evens) {
        while (original.first != null) {
            if (original.first.element % 2 == 0) {
                evens.insertLast(original.first.element);
            } else {
                odds.insertLast(original.first.element);
            }
            first = first.succ;
        }
    }
}

class DivideOddEven {

    public static void main(String[] args) throws IOException {
        BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
        String s = stdin.readLine();
        int N = Integer.parseInt(s);
        s = stdin.readLine();
        String[] pomniza = s.split(" ");

        DLL<Integer> list = new DLL<Integer>();
        for (int i = 0; i < N; i++) {
            list.insertLast(Integer.parseInt(pomniza[i]));
        }

        // System.out.println(list.toString());

        DLL<Integer> odds = new DLL<Integer>();
        DLL<Integer> evens = new DLL<Integer>();
        list.split(list, odds, evens);

        System.out.println(odds.toString());
        System.out.println(evens.toString());
    }
}