Codesignal - evenDigingsOnly

Check if all digits of the given integer are even.

 

Example

• For n = 248622, the output should be
  evenDigitsOnly(n) = true;
• For n = 642386, the output should be
  evenDigitsOnly(n) = false.

Input/Output

• [execution time limit] 20 seconds (swift)
• [input] integer n
• Guaranteed constraints:
  1 ≤ n ≤ 109.
• [output] boolean
  • true if all digits of n are even, false otherwise.

풀이

주어지는 숫자의 각 자리수에 해당하는 숫자가 짝수일때만 리턴 true

func evenDigitsOnly(n: Int) -> Bool {
    let strN = String(n)

    for i in strN.indices {
        guard let num = Int(String(strN[i])) else { return false }
        if num % 2 != 0 {
            return false
        }
    }
    return true
}