[swift] 프로그래머스 - 괄호 회전하기

프로그래머스

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풀이

func solution(_ s:String) -> Int {
    var result = 0
    var str = Array(s)
    for _ in 0..<s.count {
        var stack = [Character]()
        for i in 0..<s.count {
            stack.append(str[i])
            guard stack.count > 1 else { continue }
            if stack.last! == "}" {
                if stack.suffix(2) == ["{","}"] {
                    stack.removeLast(2)
                    continue
                } else {
                    break
                }
            }
            if stack.last! == ")" {
                if stack.suffix(2) == ["(",")"] {
                    stack.removeLast(2)
                    continue
                } else {
                    break
                }
            }
            if stack.last! == "]" {
                if stack.suffix(2) == ["[","]"] {
                    stack.removeLast(2)
                    continue
                } else {
                    break
                }
            }
        }
        if stack.isEmpty { result += 1 }
        str.append(str.first!)
        str.removeFirst()
    }
    return result
}

 

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