[Swift] 예상 대진표

import Foundation

func solution(_ n:Int, _ a:Int, _ b:Int) -> Int
{
    var n = n
    var a = a
    var b = b
    var answer = 0
    
    repeat {
        a = (a + 1) / 2
        b = (b + 1) / 2
        answer += 1
    } while a != b
        
    return answer
}