Frequency Measuring Techniques for Competitive Programming | Python3 program to count frequencies of array items ; Create an array to store counts . The size of array is limit + 1 and all values are initially 0 ; Traverse through string characters and count frequencies ;
limit = 255 NEW_LINE def countFreq ( Str ) : NEW_LINE INDENT count = [ 0 ] * ( limit + 1 ) NEW_LINE for i in range ( len ( Str ) ) : NEW_LINE INDENT count [ ord ( Str [ i ] ) ] += 1 NEW_LINE DEDENT for i in range ( limit + 1 ) : NEW_LINE if ( count [ i ] > 0 ) : NEW_LINE INDENT print ( chr ( i ) , count [ i ] ) NEW_LINE DEDENT DEDENT / * Driver Code * / NEW_LINE Str = " GeeksforGeeks " NEW_LINE countFreq ( Str ) NEW_LINE