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Least frequent element in an array | Python 3 program to find the least frequent element in an array ..
Sort the array.
find the min frequency using linear traversal.
If last element is least frequent.
Driver program"
Solution in Python:
 What is a code to least frequent element in an array and the other steps required?
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#Here is code to least frequent element in an array and the other steps required.
 def leastFrequent ( arr , n ) :
	arr . sort ( )
	min_count = n + 1
	res = - 1
	curr_count = 1
	for i in range ( 1 , n ) :
		if ( arr [ i ] == arr [ i - 1 ] ) :
			curr_count = curr_count + 1
		else :
			if ( curr_count < min_count ) :
				min_count = curr_count
				res = arr [ i - 1 ]
			curr_count = 1
	if ( curr_count < min_count ) :
		min_count = curr_count
		res = arr [ n - 1 ]
	return res
arr = [ 1 , 3 , 2 , 1 , 2 , 2 , 3 , 1 ]
n = len ( arr )
print ( leastFrequent ( arr , n ) )