human
Find largest d in array such that a + b + c = d | The function finds four elements with given sum X.
Store sums ( a + b ) of all pairs ( a , b ) in a hash table.
Traverse through all pairs and find ( d - c ) is present in hash table.
If d - c is present in hash table ,.
Making sure that all elements are distinct array elements and an element is not considered more than once ..
Driver Code"
How can the above be solved in Python?
assistant
#Here is code to find largest d in array such that a + b + c = d and the other steps required.
 def findFourElements ( arr , n ) :
	mp = dict ( )
	for i in range ( n - 1 ) :
		for j in range ( i + 1 , n ) :
			mp [ arr [ i ] + arr [ j ] ] = ( i , j )
	d = - 10 ** 9
	for i in range ( n - 1 ) :
		for j in range ( i + 1 , n ) :
			abs_diff = abs ( arr [ i ] - arr [ j ] )
			if abs_diff in mp . keys ( ) :
				p = mp [ abs_diff ]
				if ( p [ 0 ] != i and p [ 0 ] != j and p [ 1 ] != i and p [ 1 ] != j ) :
					d = max ( d , max ( arr [ i ] , arr [ j ] ) )
	return d
arr = [ 2 , 3 , 5 , 7 , 12 ]
n = len ( arr )
res = findFourElements ( arr , n )
if ( res == - 10 ** 9 ) :
	print ( " No ▁ Solution . " )
else :
	print ( res )