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countingValleys.swift
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countingValleys.swift
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import Foundation
/*
* Complete the 'countingValleys' function below.
*
* The function is expected to return an INTEGER.
* The function accepts following parameters:
* 1. INTEGER steps
* 2. STRING path
*/
func countingValleys(steps: Int, path: String) -> Int {
var valleysNumber = 0
var altitude = 0
for (_,value) in path.enumerated() {
if( value == "U") {
altitude = altitude + 1
if (altitude == 0) {
valleysNumber = valleysNumber + 1
}
}
else {
altitude = altitude - 1
}
}
return valleysNumber
}
let stdout = ProcessInfo.processInfo.environment["OUTPUT_PATH"]!
FileManager.default.createFile(atPath: stdout, contents: nil, attributes: nil)
let fileHandle = FileHandle(forWritingAtPath: stdout)!
guard let steps = Int((readLine()?.trimmingCharacters(in: .whitespacesAndNewlines))!)
else { fatalError("Bad input") }
guard let path = readLine() else { fatalError("Bad input") }
let result = countingValleys(steps: steps, path: path)
fileHandle.write(String(result).data(using: .utf8)!)
fileHandle.write("\n".data(using: .utf8)!)