human
Count of decrement operations required to obtain K in N steps | Function to check whether m number of steps of type 1 are valid or not.
If m and n are the count of operations of type 1 and type 2 respectively , then n - m operations are performed.
Find the value of S after step 2.
If m steps of type 1 is valid.
Function to find the number of operations of type 1 required.
Iterate over the range.
Find the value of mid.
Check if m steps of type 1 are valid or not.
If mid is the valid number of steps.
If no valid number of steps exist.
Given and N , K.
Function call"
How can the above be solved in Python?
 ... Give me a code to count of decrement operations required to obtain K in N steps and the other steps required?
assistant
#Here is code to count of decrement operations required to obtain K in N steps and the other steps required.
 def isValid ( n , m , k ) :
	step2 = n - m
	cnt = ( step2 * ( step2 + 1 ) ) // 2
	if ( cnt - m == k ) :
		return 0
	if ( cnt - m > k ) :
		return 1
	return - 1
def countOfOperations ( n , k ) :
	start = 0
	end = n
	ok = 1
	while ( start <= end ) :
		mid = ( start + end ) // 2
		temp = isValid ( n , mid , k )
		if ( temp == 0 ) :
			ok = 0
			print ( mid )
			break
		elif ( temp == 1 ) :
			start = mid + 1
		else :
			end = mid - 1
	if ( ok ) :
		print ( " - 1" )
N = 5
K = 4
countOfOperations ( N , K )