超時代碼60分

import java.util.LinkedList;import java.util.List;import java.util.ListIterator;import java.util.Scanner;public class Main {		public static void main(String[] args) {		Scanner in = new Scanner(System.in);		List<Integer> list = new LinkedList<Integer>();		int n = in.nextInt();		int m = in.nextInt();		for(int i=0; i<n; i++) {			int temp = in.nextInt();			list.add(temp);		}		for(int i=0; i<m; i++) {			String op = in.next();			if(op.equals("DEL")) {				int p = in.nextInt();				for (ListIterator it = list.listIterator(); it.hasNext();) {					int obj = (int) it.next();					if(obj == p)						//從列表中移除由 next 或 PRevious 返回的最后一個元素（可選操作）						it.remove();				}			} else {				int p = in.nextInt();				int q = in.nextInt();				for (ListIterator it = list.listIterator(); it.hasNext();) {					int obj = (int) it.next();					if(obj == p) {						it.set(q);						it.add(p);					}				}			}		}		System.out.println(list.size());		boolean flag = true;		for (int temp : list) {			if(flag) {				flag = false;				System.out.print(temp);			} else {				System.out.print(" " + temp);			}		}		System.out.println();	}}