题解 | #数字翻转#

import java.util.Scanner;
// import java.util.splitIntoDigits;
import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();

        Deque<Integer> digits1 = splitIntoDigits(a);
        Deque<Integer> digits2 = splitIntoDigits(b);

        int sum1 = 0;
        int m1 = digits1.size()-1;
        while(!digits1.isEmpty()){
            sum1 += digits1.remove()*Math.pow(10,m1);
            m1--;
        }
        int sum2 = 0;
        int m2 = digits2.size()-1;
        while(!digits2.isEmpty()){
            sum2 += digits2.remove()*Math.pow(10,m2);
            m2--;
        }
       
        int c = sum1+sum2;
 
        //对rev(x) + rev(y)进行翻转
        Deque<Integer> digits3 = splitIntoDigits(c);
        int sum3 = 0;
        int m3 = digits3.size()-1;
        while(!digits3.isEmpty()){
            sum3 += digits3.remove()*Math.pow(10,m3);
            m3--;
        }

        System.out.println((sum3));

    }


    public static Deque<Integer> splitIntoDigits(int num){
        Deque<Integer> deque = new LinkedList<>();
        while(num>0){
            deque.add(num % 10);//余数. 取余数即可
            num /= 10;  //除以10的结果512/10=51
        }
        // 123 -> 321 100 -> 001 peek消除
        while(deque.peek()==0){
            deque.remove(deque.peek());
        }
        //消除前导0
        return deque;

    }
}