网易前端笔试第二题2017

import java.util.*;

/*把并列的两个整数（中间用空格隔开）倒转，并去掉开头的0，然后将两个结果合起来再倒转，去0；
 * 输入：123 234
 * 输出：234123
 * 输入：10020 123
 * 输出： 1231002*/
public class daozhuan {
    public static void main(String[] args){
        Scanner cin = new Scanner(System.in);
        String str = cin.nextLine();
        String[] st = str.split(" ");
        char[] s = st[0].toCharArray();
        char[] t = st[1].toCharArray();
        char[] a = rev(s);
        char[] b = rev(t);
        List<Character> list = clear(a);
        List<Character> list1 = clear(b);
        /*for(char i:list){
            System.out.print(i);
        }*/
        /*for(int i=0;i<list.size();i++){
            System.out.print(list.get(i));
        }*/
        char[] result = new char[list.size()+list1.size()];
        for(int i=0;i<result.length;i++){
            if(i<list.size()){
                result[i]=list.get(i);
            }else{
                result[i]=list1.get(i-list.size());
            }
        }
        result = rev(result);
        for(int i=0;i<result.length;i++){
            System.out.print(result[i]);
        }
        
    }
    public static ArrayList<Character> clear(char[] s){
        ArrayList<Character> list = new ArrayList<Character>();
        int flag=0;        
        for(int i=0;i<s.length;i++){
            if(s[i]!=48){
                flag=i;
                break;
            }
        }
        for(int i=flag;i<s.length;i++){
            list.add(s[i]);
        }        
        return list;
    }
    public static char[] rev(char[] s){
        char temp=0;
        int len = s.length-1;
        for(int i=0;i<=len/2;i++){
            temp=s[i];
            s[i]=s[len-i];
            s[len-i]=temp;
        }
        
        return s;
    }
}