Project Euler(34)

Posted on Tuesday, January 6th, 2009 at 12:24 am by Universe Queen

Problem 34:

145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145.

Find the sum of all numbers which are equal to the sum of the factorial of their digits.

Note: as 1! = 1 and 2! = 2 are not sums they are not included.

Answer: 40730

Implementation in Java:

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public class Euler34 
{
	public static int factory( int n )
	{
		int result = 1;
 
		for( int i=1; i<=n; i++ )
		{
			result *= i;
		}
 
		return result; 
	}
 
	public static boolean isOK( int n )
	{
		int result = 0;
		int number = n;
		int tmp;
 
		while( number > 0 )
		{
			tmp = number - number/10*10;
			result += factory( tmp );
			number /= 10;
		}
 
		if( n == result )
		{
			return true;
		}
 
		return false;
	}
 
	public static void main(String[] args) 
	{
		int result = 0;
 
		for( int i=3; i<=2540160; i++ )
		{
			if( isOK(i) )
			{
				result += i;
			}
		}
 
		System.out.println( result );
	}
}

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