human
Sum of all substrings of a string representing a number | Set 2 ( Constant Extra Space ) | Returns sum of all substring of num.
Initialize result.
Here traversing the array in reverse order . Initializing loop from last element . mf is multiplying factor ..
Each time sum is added to its previous sum . Multiplying the three factors as explained above . int ( s [ i ] ) is done to convert char to int ..
Making new multiplying factor as explained above ..
Driver code to test above methods"
Solution in Python:

What is a code to sum of all substrings of a string representing a number and the other steps required?
assistant
#Here is code to sum of all substrings of a string representing a number and the other steps required.
 def sumOfSubstrings ( num ) :
	sum = 0
		mf = 1
		for i in range ( len ( num ) - 1 , - 1 , - 1 ) :
			sum = sum + ( int ( num [ i ] ) ) * ( i + 1 ) * mf
			mf = mf * 10 + 1
		return sum
if __name__ == ' _ _ main _ _ ' :
	num = "6759"
	print ( sumOfSubstrings ( num ) )