PhoneNumberList_baekjoon

phoneNumber.swift

let repeatNum = Int(readLine()!)!

for i in 0..<repeatNum {
    let testCount = Int(readLine()!)!
    var answer = true
    var numbers = [String]()
    
    for j in 0..<testCount {
        let number = readLine()!
        numbers.append(number)
    }
    numbers.sort()

a: for i in 0..<numbers.count-1 {
    if numbers[i + 1].hasPrefix(numbers[i]) {
        answer = false
        break a
    }
}
    answer == false ? print("NO") : print("YES")
}