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// @Title: 检测大写字母 (Detect Capital)
// @Author: 15816537946@163.com
// @Date: 2021-11-13 13:43:28
// @Runtime: 0 ms
// @Memory: 2 MB
func detectCapitalUse(word string) bool {
    n := len(word)
    if n == 1 {
        return true
    }

    isSameChar  := isUpperChar(word[1])
    for i :=1;i<len(word);i++ {
        isUpper :=  isUpperChar(word[i]) 
        if isSameChar != isUpper {
            return false
        }
        isSameChar = isUpper
    }

    if isSameChar && !isUpperChar(word[0]) {
        return false
    }
    
    return true
}

func isUpperChar(s byte) bool {
    return s >='A' && s <='Z'
}