human
Number of sub | Function to return the count of the required substrings.
To store the final answer.
Loop to find the answer.
Condition to update the answer.
Driver code"
How can the above be solved in Python?
assistant
#Here is code to number of sub and the other steps required.
 def countSubStr ( strr , lenn ) :
	ans = 0
	for i in range ( lenn ) :
		if ( strr [ i ] == '0' ) :
			ans += ( i + 1 )
	return ans
strr = "10010"
lenn = len ( strr )
print ( countSubStr ( strr , lenn ) )