[Algorithm] StrSymmetryPoint 문제 풀이

[hwangJi-dev]

💬 문제

https://app.codility.com/programmers/trainings/4/str_symmetry_point/

💬 Idea

• 중간 인덱스까지 비교하며 같지 않다면 return -1, 같다면 mid를 리턴한다.

💬 풀이

public func solution(_ S : inout String) -> Int {
    if S.count % 2 == 0 { return -1 }
    
    let mid = S.count / 2
    var start = 0
    var end = S.count - 1
    let s = Array(S).map({ String($0) })
    
    while start < mid {
        if s[start] != s[end] {
            return -1
        }
        
        start += 1
        end -= 1
    }
    
    return mid
}

효율성 0점 풀이 : https://app.codility.com/demo/results/trainingDY7DPQ-PFH/

100점 풀이 : https://app.codility.com/demo/results/trainingZNRGGS-24G/