zarb

#include<iostream>
#include<stdio.h>

using namespace std;

int main()
{
	int a[10], b[10], c[20];
	for (int i = 0; i < 10; i++)
		a[i] = b[i] = 0;

	for (int i = 0; i < 20; i++)
		c[i] = 0;

	a[9] = 4;
	a[8] = 1;

	b[9] = 4;
	b[8] = 2;
	b[7] = 3;

	int counter = 10;
	for (int i = 9; i > -1; i--)
	{
		for (int j = 9; j > -1; j--)
		{
			int mul = (a[i] * b[j]);
			c[j + counter] = mul + c[j + counter];

			if (c[j + counter] > 9)
			{
				c[j + counter - 1] += (c[j + counter] / 10);
				c[j + counter] = c[j + counter] % 10;
			}
		}
		counter--;
	}

	return 0;
}