Maximum product quadruple ( sub | Function to find a maximum product of a quadruple in array of integers of size n ; if size is less than 4 , no quadruple exists ; Sort the array in ascending order ; Return the maximum of x , y and z ; Driver Code
function maxProduct ( arr , n ) { if ( n < 4 ) return - 1 ; arr . sort ( function ( a , b ) { return a - b ; } ) ; let x = arr [ n - 1 ] * arr [ n - 2 ] * arr [ n - 3 ] * arr [ n - 4 ] ; let y = arr [ 0 ] * arr [ 1 ] * arr [ 2 ] * arr [ 3 ] ; let z = arr [ 0 ] * arr [ 1 ] * arr [ n - 1 ] * arr [ n - 2 ] ; return Math . max ( x , Math . max ( y , z ) ) ; } let arr = [ - 10 , - 3 , 5 , 6 , - 20 ] ; let n = arr . length ; let max = maxProduct ( arr , n ) ; if ( max == - 1 ) document . write ( " " ) ; else document . write ( " " + max ) ;