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
def countSubStr ( strr , lenn ) : NEW_LINE INDENT ans = 0 NEW_LINE for i in range ( lenn ) : NEW_LINE INDENT if ( strr [ i ] == '0' ) : NEW_LINE INDENT ans += ( i + 1 ) NEW_LINE DEDENT DEDENT return ans NEW_LINE DEDENT strr = "10010" NEW_LINE lenn = len ( strr ) NEW_LINE print ( countSubStr ( strr , lenn ) ) NEW_LINE