题解 | #高精度整数加法#java目前最简单解法，不服来战

import java.util.Scanner;
import java.math.BigDecimal;


public class Main {
    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);
        BigDecimal num1 = new BigDecimal(in.nextLine());
        BigDecimal num2 = new BigDecimal(in.nextLine());
        System.out.println(num1.add(num2));
    }
}