Recap - Event Guests

Part of the Logic & Flow section of Coddy's Kotlin journey. Lesson 15 of 63.

Challenge

Medium

Complete guestChanges with parameters invited: List<String>, arrived: List<String>. Return distinct invited guests who have not arrived, sorted alphabetically. Ignore uninvited arrivals and duplicate names. Names are lowercase ASCII.

Unless stricter bounds are stated above, collections contain at most 100 elements at each level, and integer arguments and integer collection values are between -1000 and 1000. Text supplied for parsing can include invalid or out-of-range representations as described.

Return a value of type List<String>. Keep the supplied input/output code. It reads scalar arguments one per line; a list starts with its count followed by its elements, and a map starts with its entry count followed by each key and value. Nested lists repeat the count-and-elements format for each row. The supplied main prints the return value followed by one newline. Lists use Kotlin's standard bracketed format; print no additional labels.

Try it yourself

fun guestChanges(invited: List<String>, arrived: List<String>): List<String> {
    // Write your solution here.
    return emptyList()
}
fun main() {
    val invitedCount = readln().toInt()
    val invited = mutableListOf<String>()
    for (i0 in 0 until invitedCount) {
        val invitedItem = readLine().orEmpty()
        invited.add(invitedItem)
    }
    val arrivedCount = readln().toInt()
    val arrived = mutableListOf<String>()
    for (i0 in 0 until arrivedCount) {
        val arrivedItem = readLine().orEmpty()
        arrived.add(arrivedItem)
    }
    println(guestChanges(invited, arrived))
}