PAT1005

代码如下：

import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        int num = input.nextInt();
        ArrayList<Integer> arrList = new ArrayList<Integer>();
        for(int i = 0;i<num;i++){
            arrList.add(input.nextInt());
        }
        ArrayList<Integer> arrListTemp = new ArrayList<Integer>(arrList);
        for(int j = 0;j<num;j++){
            int temp = arrListTemp.get(j);
            while(temp!=1){
                if(temp%2==1){
                    temp = (temp*3+1)>>1;
                    if(arrList.contains(temp)){
                        arrList.remove(Integer.valueOf(temp));
                    }
                }else{
                    temp = temp>>1;
                    if(arrList.contains(temp)){
                        arrList.remove(Integer.valueOf(temp));
                    }
                }
            }
        }
        Collections.sort(arrList,Collections.reverseOrder());
        for(int k = 0;k<arrList.size();k++){
            if(k==(arrList.size()-1)){
                System.out.print(arrList.get(k));
            }else{
                System.out.print(arrList.get(k)+" ");
            }
        }
    }
}