> For the complete documentation index, see [llms.txt](https://dfine.gitbook.io/leetcode/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dfine.gitbook.io/leetcode/520.detect_capital.md).

# 520.Detect Capital

**520.Detect Capital**

难度:Easy

> 给定一个单词，你需要判断单词的大写使用是否正确。

我们定义，在以下情况时，单词的大写用法是正确的：

全部字母都是大写，比如"USA"。 单词中所有字母都不是大写，比如"leetcode"。 如果单词不只含有一个字母，只有首字母大写， 比如 "Google"。 否则，我们定义这个单词没有正确使用大写字母。

示例 1:

```
输入: "USA"
输出: True
示例 2:

输入: "FlaG"
输出: False
```

注意: 输入是由大写和小写拉丁字母组成的非空单词。

简单题，直接条件判断：

```
class Solution {
public:
    bool detectCapitalUse(string word) {
        if(word[0]>='A' && word[0] <='Z')
        {
            if(word.size()<=2) return true;
            if(word[1]>='A' && word[1]<='Z') 
            {
                for(int i=2;i<word.size();i++)
                    if(word[i]>='a' && word[i]<='z') return false;
            }
            else
            {
                for(int i=2;i<word.size();i++)
                    if(word[i]>='A' && word[i]<='Z') return false;
            }
        }
        else
            for(auto c: word)
                if(c>='A' && c<='Z') return false;
        return true;
    }
};
```

> 执行用时 : 8 ms, 在Detect Capital的C++提交中击败了93.06% 的用户\
> 内存消耗 : 8.1 MB, 在Detect Capital的C++提交中击败了91.24% 的用户


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