Question

How to remove odd frequency characters from a string in Kotlin

Answer 1

import java.util.HashMap

fun removeOddFrequencyCharacters(s: String): String {
    val frequencyMap = HashMap<Char, Int>()
    val chArray = s.toCharArray()

    // Count the frequency of each character
    for (ch in chArray) {
        frequencyMap[ch] = frequencyMap.getOrDefault(ch, 0) + 1
    }

    // Build the result string excluding characters with odd frequencies
    val result = StringBuilder()
    for (ch in chArray) {
        if (frequencyMap[ch]!! % 2 == 0) {
            result.append(ch)
        }
    }

    return result.toString()
}

fun main() {
    var s = "kotlin programming version 2.0.20"

    s = removeOddFrequencyCharacters(s)

    println(s)
}


 
 
/*
run:
   
gmmg2.0.20
   
*/

 

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