算法训练 删除数组零元素

import java.util.Scanner;

public class Main {

    public static int CompactIntegers(int[] Num , int N){
        int cnt = N;
        for ( int i = 0 ; i < cnt ; i++){
            if ( Num[i] == 0){
                for ( int j = i+1 ; j < cnt ; j++){
                    Num[j-1] = Num[j];
                }
                cnt--;
                i--;
            }
        }
        return cnt;
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner in = new Scanner(System.in);
        int N = in.nextInt();
        int[] Num = new int[N];
        for ( int i = 0 ; i < N ; i++){
            Num[i] = in.nextInt();
        }

        int len = CompactIntegers(Num, N);
        if ( len == 0){
            System.out.print(0);
        }else{
            System.out.println(len);
            System.out.print(Num[0]);
            for ( int i = 1 ; i < len ; i++){
                System.out.print(" "+Num[i]);
            }
        }

        in.close();
    }

}