Given a string str containing only lowercase characters. The task is to print the characters having prime frequency in the order of their occurrence.
Note that repeated elements with prime frequencies are printed as many times as they occur in order of their occurrence.
Input: str = “geeksforgeeks”
Character Frequency ‘g’ 2 ‘e’ 4 ‘k’ 2 ‘s’ 2 ‘f’ 1 ‘o’ 1 ‘r’ 1
‘g’, ‘k’ and ‘s’ are the only characters with prime frequencies.
Input: str = “aeroplane”
Approach: Create a frequency array to store the frequency of each of the character of the given string str. Traverse the string str again and check whether the frequency of that character is prime using Sieve Of Eratosthenes.
Below is the implementation of the above approach:
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- Print characters having even frequencies in order of occurrence
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