Three Great Candidates

PROBLEM :
The hiring team of Google aims to find 3 candidates who are great collectively. Each candidate has his or her ability expressed as an integer. 3 candidate are great collectively if product of their abilities is maximum. Find the maximum collective ability from the given pool of candidates.

Input:
The first line of input contains an integer T denoting the number of test cases. Then T test cases follow. First line of each test case conatins an interger N  denoting the number of candidates.
The second line of each test case contains N space separated elements denoting the ablities of candidates.

Output:
Corresponding to each test case, print the desired output(maximum collective ability of three candidates) in a newline.

Constraints:
1 = T = 100
3 = N = 1000
-1000 = ability = 1000

Example:
Input
1
6
0 -1 3 100 70 50

Output:
350000

Explanation
70*50*100 = 350000 which is the maximum possible.

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SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

#include<iostream>
using namespace std;
#include<algorithm>
long long three_greatest(int [],int ) ;
int main()
 {
int t,i,no ;
int arr[1000] ;
cin>>t ;
while(t--)
{
   cin>>no ;
   for(i=0;i<no;i++)
       cin>>arr[i] ;
     
   cout<<three_greatest(arr,no)<<endl  ;
}
return 0;
}

long long three_greatest(int arr[],int no)
{
    int i,temp[5] ;
    long long p1,p2 ;
    p1=1,p2=1 ;
   
    sort(arr,arr+no) ;
   
    temp[0]=arr[0] ;
    temp[1]=arr[1] ;
    temp[2]=arr[no-3] ;
    temp[3]=arr[no-2] ;
    temp[4]=arr[no-1] ;
   
    p1=(temp[0]*temp[1])*temp[4] ;
    p2=(temp[2]*temp[3])*temp[4] ;
   
    return p1>p2?p1:p2 ;
}

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