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sos!!!

Posted by jimi at 2007-11-01 09:07:21 on Problem 2231 
主程:
                for(i=0;i<n;i++)
			scanf("%ld",&a[i]);
		qsort(a,n,sizeof(long),cmp);
		n = (n-1) * 2;
		sum = 0;
		for(i=0,k=0,j=n;i<=n;i+=2,j-=2,k++)
			sum+=a[k]*(i-j);
		printf("%lld\n",sum);

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