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68 lines
1.6 KiB
Markdown
68 lines
1.6 KiB
Markdown
# [520. Detect Capital](https://leetcode.com/problems/detect-capital/)
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## 题目
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We define the usage of capitals in a word to be right when one of the following cases holds:
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All letters in this word are capitals, like "USA".
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All letters in this word are not capitals, like "leetcode".
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Only the first letter in this word is capital, like "Google".
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Given a string word, return true if the usage of capitals in it is right.
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**Example 1:**
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```
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Input: word = "USA"
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Output: true
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```
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**Example 2:**
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```
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Input: word = "FlaG"
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Output: false
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```
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**Constraints:**
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- 1 <= word.length <= 100
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- word consists of lowercase and uppercase English letters.
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## 题目大意
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我们定义，在以下情况时，单词的大写用法是正确的：
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全部字母都是大写，比如 "USA" 。
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单词中所有字母都不是大写，比如 "leetcode" 。
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如果单词不只含有一个字母，只有首字母大写，比如"Google" 。
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给你一个字符串 word 。如果大写用法正确，返回 true ；否则，返回 false 。
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## 解题思路
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- 把 word 分别转换为全部小写 wLower，全部大写 wUpper，首字母大写的字符串 wCaptial
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- 判断 word 是否等于 wLower, wUpper, wCaptial 中的一个，如果是返回 true，否则返回 false
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## 代码
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```go
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package leetcode
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import "strings"
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func detectCapitalUse(word string) bool {
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wLower := strings.ToLower(word)
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wUpper := strings.ToUpper(word)
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wCaptial := strings.ToUpper(string(word[0])) + strings.ToLower(string(word[1:]))
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if wCaptial == word || wLower == word || wUpper == word {
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return true
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}
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return false
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}
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``` |