SUMFOUR  4 values whose sum is 0
The SUM problem can be formulated as follows: given four lists A, B, C, D of integer values, compute how many quadruplet (a, b, c, d ) belongs to A x B x C x D are such that a + b + c + d = 0 . In the following, we assume that all lists have the same size n
Input
The first line of the input file contains the size of the lists n (this value can be as large as 4000). We then have n lines containing four integer values (with absolute value as large as 2^{28} ) that belong respectively to A, B, C and D .
(Edited: n <= 2500)
Output
Output should be printed on a single line.
Example
Input: 6 45 22 42 16 41 27 56 30 36 53 37 77 36 30 75 46 26 38 10 62 32 54 6 45 Output: 5
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Rajat (1307086):
20150131 01:42:23
Lot of optimization needed. 

kailash:
20150120 07:35:33
@Chandan Mittal if you have used cin and cout , try using printf and scanf 

Chandan Mittal:
20150108 23:56:49
O(n^2 * log(n)) gives TLE. But why??? :( 

ankit kumar sinha:
20150101 14:14:07
dont use long long int. gives TLE


ashish kumar:
20141229 13:55:20
wrong ans on test case 9 

Miguel Oliveira:
20140611 13:51:00
very weak test cases, it doesn't even have n up to 4000 

Ehor Nechiporenko:
20100223 11:24:23
Manish  the right answer 4^4 = 256


Manish kumar:
20100211 16:11:33
4


Ruslan Sennov:
20090630 02:40:46
hint:

Added by:  Abhilash I 
Date:  20070206 
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