520. Detect Capital

Description

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, like "Google".

Given a string word, return true if the usage of capitals in it is right.

 

Example 1:

Input: word = "USA"
Output: true

Example 2:

Input: word = "FlaG"
Output: false

 

Constraints:

  • 1 <= word.length <= 100
  • word consists of lowercase and uppercase English letters.

Solutions

Solution 1

Python Code
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class Solution:
    def detectCapitalUse(self, word: str) -> bool:
        cnt = 0
        for c in word:
            if c.isupper():
                cnt += 1
        return cnt == 0 or cnt == len(word) or (cnt == 1 and word[0].isupper())

Java Code
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class Solution {
    public boolean detectCapitalUse(String word) {
        int cnt = 0;
        for (char c : word.toCharArray()) {
            if (Character.isUpperCase(c)) {
                ++cnt;
            }
        }
        return cnt == 0 || cnt == word.length()
            || (cnt == 1 && Character.isUpperCase(word.charAt(0)));
    }
}

C++ Code
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class Solution {
public:
    bool detectCapitalUse(string word) {
        int cnt = 0;
        for (char c : word)
            if (isupper(c)) ++cnt;
        return cnt == 0 || cnt == word.size() || (cnt == 1 && isupper(word[0]));
    }
};

Go Code
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func detectCapitalUse(word string) bool {
	cnt := 0
	for _, c := range word {
		if unicode.IsUpper(c) {
			cnt++
		}
	}
	return cnt == 0 || cnt == len(word) || (cnt == 1 && unicode.IsUpper(rune(word[0])))
}