Discussion @ 1306. Sequence Median @ Timus Online Judge

Compile Help! WA test #5 [2] // Problem 1306. Sequence Median 4 Mar 2005 22:38

I use unsigned long.
res=double(a[count/2-1])/2.0+double(a[count/2])/2.0

test:
2
4000000001
4000000000
answer:
4000000000.5

I can't anderstand why WA test 5#
Please, Help.

I am get tester... Your test is incorrect [1] // Problem 1306. Sequence Median 23 Oct 2005 13:29

4000000000 > 2147483647 and
4000000001 > 2147483647 too.
It is bad test.
I wrote

double res = (double)arr[count/2] + (double)arr[count/2-1];
res /= 2;

And this worked.

Peter Petrov (Sedefcho) Re: Your test is incorrect -> His test is actually correct! // Problem 1306. Sequence Median 14 Jul 2006 18:00

4000000000 and 4000000001 is not a bad test!
Read the problem carefully.
The max number in sequence can be
(2^32 - 1) = 4294967295.
So (4 * 10^9) is pretty OK for a test.

Discussion of Problem 1306. Sequence Median