Encrypt string with product of number of vowels and consonants in substring of size k | isVowel ( ) is a function that returns true for a vowel and false otherwise . ; function to Encrypt the string ; cv to count vowel cc to count consonants ; Counting prefix count of vowel and prefix count of consonants ; generating the encrypted string . ; Driver Code
def isVowel ( c ) : NEW_LINE INDENT return ( c == ' a ' or c == ' e ' or c == ' i ' or c == ' o ' or c == ' u ' ) NEW_LINE DEDENT def encryptString ( s , n , k ) : NEW_LINE INDENT cv = [ 0 for i in range ( n ) ] NEW_LINE cc = [ 0 for i in range ( n ) ] NEW_LINE if ( isVowel ( s [ 0 ] ) ) : NEW_LINE INDENT cv [ 0 ] = 1 NEW_LINE DEDENT else : NEW_LINE INDENT cc [ 0 ] = 1 NEW_LINE DEDENT for i in range ( 1 , n ) : NEW_LINE INDENT cv [ i ] = cv [ i - 1 ] + isVowel ( s [ i ] ) NEW_LINE cc [ i ] = cc [ i - 1 ] + ( isVowel ( s [ i ] ) == False ) NEW_LINE DEDENT ans = " " NEW_LINE prod = 0 NEW_LINE prod = cc [ k - 1 ] * cv [ k - 1 ] NEW_LINE ans += str ( prod ) NEW_LINE for i in range ( k , len ( s ) ) : NEW_LINE INDENT prod = ( ( cc [ i ] - cc [ i - k ] ) * ( cv [ i ] - cv [ i - k ] ) ) NEW_LINE ans += str ( prod ) NEW_LINE DEDENT return ans NEW_LINE DEDENT if __name__ == ' _ _ main _ _ ' : NEW_LINE INDENT s = " hello " NEW_LINE n = len ( s ) NEW_LINE k = 2 NEW_LINE print ( encryptString ( s , n , k ) ) NEW_LINE DEDENT