Build the next version of the Unix sort command, this time with the -r flag baked in. Given a list of lines, return them sorted in descending order by character code (the exact reverse of v1's order, like LC_ALL=C sort -r: lowercase letters come before uppercase ones), joined by newline characters (\n). Duplicates are all kept. If the list is empty, return the empty string.
Function signature:
fun sortLines(lines: List<String>): String
Example:
Input: lines = ["banana", "apple", "cherry"] Output: "cherry\nbanana\napple" When printed: cherry banana apple
Convert to a mutable list, call
sortDescending(), then combine with joinToString("\n").
The full solution:
class Solution {
fun sortLines(lines: List<String>): String {
val sortedLines = lines.toMutableList()
sortedLines.sortDescending()
return sortedLines.joinToString("\n")
}
}
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