human
Maximum XOR using K numbers from 1 to n | To return max xor sum of 1 to n using at most k numbers.
If k is 1 then maximum possible sum is n.
Finding number greater than or equal to n with most significant bit same as n . For example , if n is 4 , result is 7. If n is 5 or 6 , result is 7.
Return res - 1 which denotes a number with all bits set to 1.
Driver code"
Solution in Python:
 What is a code to maximum XOR using K numbers from 1 to n and the other steps required?
assistant
#Here is code to maximum XOR using K numbers from 1 to n and the other steps required.
 def maxXorSum ( n , k ) :
	if k == 1 :
		return n
	res = 1
	while res <= n :
		res <<= 1
	return res - 1
n = 4
k = 3
print ( maxXorSum ( n , k ) )