操作序列

	importjava.util.Scanner;



	importjava.util.ArrayList;



	publicclassMain{



	    publicstaticvoidmain(String [] args){



	        Scanner sc=newScanner(System.in);



	        while(sc.hasNext()){



	            ArrayList<Integer> list=newArrayList<>();



	            intn=sc.nextInt();



	            int[] nums=newint[n];



	            for(inti=0;i<n;i++)



	                nums[i]=sc.nextInt();



	            intmin=(n%2==1)?n-1:n;



	            intindex=0;



	            while(index<min){



	                if((index&1)==0){



	                    list.add(nums[index++]);



	                }else



	                    list.add(0,nums[index++]);



	            }



	            if(min==n){



	                for(inti=0;i<list.size()-1;i++){



	                    System.out.print(list.get(i)+" ");



	                }



	                System.out.println(list.get(list.size()-1));



	            }else{



	                list.add(nums[nums.length-1]);



	                for(inti=list.size()-1;i>0;i--){



	                    System.out.print(list.get(i)+" ");



	                }



	                System.out.println(list.get(0));



	            }



	        } 



	    }



	}