Envío 2938

Código

import java.util.Scanner;

import static java.lang.Math.max;

public class Main {
    public static void main(String[] args) {
        Data data = readWordFromStdin();

        int[] result = new int[max(data.number.length, data.number2.length)];
        int carry = 0;
        for (int index = 0; index < result.length; index++) {
            int sum = carry;
            if(index < data.number.length){
                sum += data.number[data.number.length - index - 1];
            }
            if(index < data.number2.length){
                sum += data.number2[data.number2.length - index - 1];
            }
            result[result.length - index - 1] = sum % 10;
            carry = sum / 10;
        }

        if (carry != 0) {
            int[] newArrayWithExtraCarry = new int[result.length + 1];
            newArrayWithExtraCarry[0] = carry;
            System.arraycopy(result, 0, newArrayWithExtraCarry, 1, newArrayWithExtraCarry.length - 1);
            result = newArrayWithExtraCarry;
        }

        printArray(result);
    }

    private static void printArray(int[] array) {
        for (int number : array) {
            System.out.print(number);
        }
    }

    private static Data readWordFromStdin() {
        Data data = new Data();
        Scanner in = new Scanner(System.in);

        data.number = readBigNumber(in);
        data.number2 = readBigNumber(in);
        return data;
    }

    private static int[] readBigNumber(Scanner in) {
        String line = in.nextLine();
        int[] numbers = new int[line.length()];
        for (int i = 0; i < line.length(); i++) {
            numbers[i] = Integer.valueOf(String.valueOf(line.charAt(i)));
        }
        return numbers;
    }

    private static class Data {
        int[] number;
        int[] number2;
    }
}