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leftRotation.swift
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leftRotation.swift
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import Foundation
/*
* Complete the 'rotateLeft' function below.
*
* The function is expected to return an INTEGER_ARRAY.
* The function accepts following parameters:
* 1. INTEGER d
* 2. INTEGER_ARRAY arr
*/
func rotateLeft(d: Int, arr: [Int]) -> [Int] {
// Write your code here
let slice1 = arr[..<d]
let slice2 = arr[d...]
return Array(slice2) + Array(slice1)
}
let stdout = ProcessInfo.processInfo.environment["OUTPUT_PATH"]!
FileManager.default.createFile(atPath: stdout, contents: nil, attributes: nil)
let fileHandle = FileHandle(forWritingAtPath: stdout)!
guard let firstMultipleInputTemp = readLine()?.replacingOccurrences(of: "\\s+$", with: "", options: .regularExpression) else { fatalError("Bad input") }
let firstMultipleInput = firstMultipleInputTemp.split(separator: " ").map{ String($0) }
guard let n = Int(firstMultipleInput[0])
else { fatalError("Bad input") }
guard let d = Int(firstMultipleInput[1])
else { fatalError("Bad input") }
guard let arrTemp = readLine()?.replacingOccurrences(of: "\\s+$", with: "", options: .regularExpression) else { fatalError("Bad input") }
let arr: [Int] = arrTemp.split(separator: " ").map {
if let arrItem = Int($0) {
return arrItem
} else { fatalError("Bad input") }
}
guard arr.count == n else { fatalError("Bad input") }
let result = rotateLeft(d: d, arr: arr)
fileHandle.write(result.map{ String($0) }.joined(separator: " ").data(using: .utf8)!)
fileHandle.write("\n".data(using: .utf8)!)