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2129. Capitalize the Title 👍

  • Time: $O(n)$
  • Space: $O(n)$
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class Solution {
 public:
  string capitalizeTitle(string title) {
    ranges::transform(title, title.begin(), ::tolower);

    int i = 0;  // Point to the start of a word.
    int j = 0;  // Point to the end of a word.

    while (j < title.length()) {
      while (j < title.length() && title[j] != ' ')
        ++j;
      if (j - i > 2)
        title[i] = toupper(title[i]);
      i = j + 1;
      ++j;  // Skip the spaces.
    }

    return title;
  }
};

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class Solution {
  public String capitalizeTitle(String title) {
    StringBuilder sb = new StringBuilder(title.toLowerCase());

    int i = 0; // Point to the start of a word.
    int j = 0; // Point to the end of a word.

    while (j < sb.length()) {
      while (j < sb.length() && sb.charAt(j) != ' ')
        ++j;
      if (j - i > 2)
        sb.setCharAt(i, Character.toUpperCase(sb.charAt(i)));
      i = j + 1;
      ++j; // Skip the spaces.
    }

    return sb.toString();
  }
}

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class Solution:
  def capitalizeTitle(self, title: str) -> str:
    return ' '.join(s.lower() if len(s) < 3 else s.capitalize() for s in title.split())