官解

func nextGreatestLetter(letters []byte, target byte) byte {idx := 0for i := 0; i < len(letters); i++ {if letters[i] > target {idx = ibreak}}return letters[idx]
}

Me

这个题答得很差劲，可能有点累

func nextGreatestLetter(letters []byte, target byte) byte {var i int = 0max := letters[0]for i != len(letters) && target >= letters[i] {i++if i == len(letters) {return letters[0]}max = letters[i]}if i >= len(letters) {return letters[0]}return max
}