projecteuler第六题

public class Task_6 {

	/**
	 * 求(1+2+…+100)²-(1²+2²+22²+…+100²)
	 * @param args
	 */
	public static void main(String[] args) {
		int n = 100;
		int sum1 = 0;
		int sum2 = 0;
	
		for(;n >= 1;n --){
			sum1 += n;
			sum2 += (n * n);
		}
		System.out.println(sum1*sum1 - sum2);
	}
	
}