difference_of_two_arrays.java

import java.util.*;

public class difference_of_two_arrays{
	public static void main(String args[]){
		Scanner scn = new Scanner(System.in);

		int n1 = scn.nextInt();

		int[] arr1 = new int[n1];

		for(int i = 0;i < arr1.length ; i++){
			arr1[i] = scn.nextInt();
		}


		int n2 = scn.nextInt();

		int[] arr2 = new int[n2];

		for(int i = 0;i < arr2.length ; i++){
			arr2[i] = scn.nextInt();
		}


		int[] diff = new int[n2];

		int c = 0;

		int i = arr1.length - 1;
		int j = arr2.length - 1;

		int k = diff.length - 1;

		while(k >= 0){
			int d = 0;
			int arr1v = i >= 0? arr1[i] : 0;

			if(arr2[j] + c >= arr1v){
				d = arr2[j] + c - arr1v;
				c = 0;
			}else{
				d = arr2[j] + c + 10 - arr1v;
				c = -1;
			}

			diff[k] = d;

			i--;
			j--;
			k--;

		}

		int idx = 0;

		while(idx < diff.length){
			if(diff[idx] == 0){
				idx++;
			}else{
				break;
			}
		}

		while(idx < diff.length){
			System.out.println(diff[idx]);
			idx++;
		}
	}
}