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520. Detect Capital 👍

  • Time: $O(n)$
  • Space: $O(1)$
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class Solution {
 public:
  bool detectCapitalUse(string word) {
    for (int i = 1; i < word.length(); ++i)
      if (isupper(word[1]) != isupper(word[i]) ||
          islower(word[0]) && isupper(word[i]))
        return false;
    return true;
  }
};

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class Solution {
  public boolean detectCapitalUse(String word) {
    return word.equals(word.toUpperCase()) ||
        word.substring(1).equals(word.substring(1).toLowerCase());
  }
}

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class Solution:
  def detectCapitalUse(self, word: str) -> bool:
    return word.isupper() or word.islower() or word.istitle()