SPOJ.com - Problem PIR

PIR - Pyramids

Recently in Farland, a country in Asia, the famous scientist Mr. Log Archeo discovered ancient pyramids. But unlike those in Egypt and Central America, they have a triangular (not rectangular) foundation. That is, they are tetrahedrons in the mathematical sense. In order to find out some important facts about the early society of the country (it is widely believed that the pyramid sizes are closely connected with Farland's ancient calendar), Mr. Archeo needs to know the volume of the pyramids. Unluckily, he has reliable data about their edge lengths only. Please, help him!

Input

t [number of tests to follow] In each of the next t lines six positive integer numbers not exceeding 1000 separated by spaces (each number is one of the edge lengths of the pyramid ABCD). The order of the edges is the following: AB, AC, AD, BC, BD, CD.

Output

For each test output a real number - the volume, printed accurate to four digits after decimal point.

Example

Input:
2
1 1 1 1 1 1
1000 1000 1000 3 4 5

Output:
0.1179
1999.9937

Submit solution!

Added by:	Adam Dzedzej
Date:	2004-05-14
Time limit:	1s
Source limit:	10000B
Memory limit:	1536MB
Cluster:	Cube (Intel G860)
Languages:	All except: NODEJS PERL6 VB.NET
Resource:	ACM ICPC 2002-2003 NEERC, Northern Subregion

hide comments

2017-10-03 04:58:11 Sushant Moon
Following the comments, solving it now it looks like the test cases have been strengthen and approximate formulas for calculating the volume won't work.

2017-08-19 12:10:48
i do not understand this question

2017-08-05 06:39:17
Many bloody tears were shed trying to get past the WA. Turns out the input file indeed contains valid pyramid dimensions only (volume will not be a complex number), but DO pay attention to variable order. Test case that helped greatly:
100 99 98 97 96 95
109082.2996

2017-06-09 10:17:18
sample testcase passed in terminal , but on submitting shows wrong on the very first case

2017-05-02 01:50:49
All sides can be stored as int
The sample test cases are correct

2017-03-11 21:46:01
Interestingly, the question setter posted the problem a few days after posting the more difficult problem TETRA. Note about previous comment which says "Use doubles for input. Test cases contain decimal inputs." The question clearly says "six positive integer numbers". So there are no decimal inputs. There can't be, my answer was accepted.

Last edit: 2017-03-11 22:04:56

2017-03-07 16:44:13
This is a purely formula based problem. If you want to learn something from it, read this article and learn the determinant from here:

http://mathforum.org/dr.math/faq/formulas/faq.irreg.tetrahedron.html

Solve the problem using determinants instead of hard-coding the answer. Good luck. :)

Edit: Use doubles for input. Test cases contain decimal inputs.

Last edit: 2017-03-07 16:44:45

2017-02-08 19:04:19
AC on the first try without having to do anything weird.

However, the example test cases are incorrect: the 2nd answer is 1999.9947 not 1999.9937

2017-01-13 16:01:26
brain_fucked !!
used pow(x, 2) instead of x*x and it worked, don't know why :0

2016-11-13 04:52:29
Do remember the correct order of input...and the ans to the second test case given is not the one stated.