human
Largest number having both positive and negative values present in the array | Function to find the largest number k such that both k and - k are present in the array.
Stores the resultant value of K.
Sort the array arr [ ].
Initialize two variables to use two pointers technique.
Iterate until the value of l is less than r.
Find the value of the sum.
If the sum is 0 , then the resultant element is found.
If the sum is negative.
Otherwise , decrement r.
Driver Code"
How can the above be solved in Python?

Can you provide a code to largest number having both positive and negative values present in the array and the other steps required?
assistant
#Here is code to largest number having both positive and negative values present in the array and the other steps required.
 def largestNum ( arr ) :
	res = 0
	arr = sorted ( arr )
	l = 0
	r = len ( arr ) - 1
	while ( l < r ) :
		sum = arr [ l ] + arr [ r ]
		if ( sum == 0 ) :
			res = max ( res , max ( arr [ l ] , arr [ r ] ) )
			return res
		elif ( sum < 0 ) :
			l += 1
		else :
			r -= 1
	return res
if __name__ == ' _ _ main _ _ ' :
	arr = [ 3 , 2 , - 2 , 5 , - 3 ]
	print ( largestNum ( arr ) )