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import Foundation
/*
Perl Weekly Challenge - 078
Task #1: Leader Element
https://perlweeklychallenge.org/blog/perl-weekly-challenge-078
*/
enum ParamError: Error {
case missingList
case invalidList
}
do {
let paramCount:Int = Int(CommandLine.argc)
if paramCount <= 1 {
throw ParamError.missingList
}
let list:String = CommandLine.arguments[1]
if isValidList(list) {
let array = list.components(separatedBy: ", ")
var index:Int = 0;
var leaderElements = [Int]();
while index < array.count - 1 {
let max:Int = findMax(array, index + 1)
let current:Int = Int(array[index])!
if current > max {
leaderElements.append(current)
}
index += 1
}
leaderElements.append(Int(array[index])!)
print(array)
print(leaderElements)
}
else {
throw ParamError.invalidList
}
}
catch ParamError.missingList {
print("Missing list.")
}
catch ParamError.invalidList {
print("Invalid list.")
}
catch let error {
print(error)
}
//
//
// Functions
func isValidList(_ list:String) -> Bool {
let pattern = "^[\\-?\\d\\,?\\s?]+$"
let regex = try! NSRegularExpression(pattern: pattern)
let range = NSRange(location: 0, length: list.utf16.count)
if regex.firstMatch(in: list, options: [], range: range) != nil {
return true
}
else {
return false
}
}
func findMax(_ array: [String], _ start:Int) -> Int {
var window = [Int]()
for i in start...array.count-1 {
window.append(Int(array[i])!)
}
return window.max()!
}
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