human
Rearrange the array to maximize the number of primes in prefix sum of the array | Function to print the re - arranged array.
Count the number of ones and twos in a [ ].
If the array element is 1.
Array element is 2.
If it has at least one 2 Fill up first 2.
Decrease the cnt of ones if even.
Fill up with odd count of ones.
Fill up with remaining twos.
If even ones , then fill last position.
Print the rearranged array.
Driver code"
How can the above be solved in Python?
assistant
#Here is code to rearrange the array to maximize the number of primes in prefix sum of the array and the other steps required.
 def solve ( a , n ) :
	ones , twos = 0 , 0
	for i in range ( n ) :
		if ( a [ i ] == 1 ) :
			ones += 1
		else :
			twos += 1
	ind = 0
	if ( twos ) :
		a [ ind ] = 2
		ind += 1
	if ones % 2 == 0 :
		evenOnes = True
	else :
		evenOnes = False
	if ( evenOnes ) :
		ones -= 1
	for i in range ( ones ) :
		a [ ind ] = 1
		ind += 1
	for i in range ( twos - 1 ) :
		a [ ind ] = 2
		ind += 1
	if ( evenOnes ) :
		a [ ind ] = 1
		ind += 1
	for i in range ( n ) :
		print ( a [ i ] , end = " ▁ " )
a = [ 1 , 2 , 1 , 2 , 1 ]
n = len ( a )
solve ( a , n )