LeetCode | 520. Detect Capital

Given a word, you need to judge whether the usage of capitals in it is right or not.

We define the usage of capitals in a word to be right when one of the following cases holds:

All letters in this word are capitals, like “USA”.
All letters in this word are not capitals, like “leetcode”.
Only the first letter in this word is capital if it has more than one letter, like “Google”.
Otherwise, we define that this word doesn’t use capitals in a right way.

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直接利用API實現，每次submit beats的比例都相差巨大，看看就好

public class Solution {
    public boolean detectCapitalUse(String word) {
        if(word.equals(word.toLowerCase())) return true;
        if(word.equals(word.toUpperCase())) return true;
        if(word.charAt(0) >= 'A') {
            String sub = word.substring(1);
            if(sub.equals(sub.toLowerCase())) return true;
        }
        return false;
    }
}

可簡化成四行解決

public class Solution {
    public boolean detectCapitalUse(String word) {
        if(word.equals(word.toUpperCase())) return true;
        String sub = word.substring(1);
        if(sub.equals(sub.toLowerCase())) return true;
        return false;
    }
}