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nanae772
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| - この実装って入力が"😀a😀"みたいな場合に2を返すことになるが、それでいいのかは要相談かも | ||
| - 見た目上は2文字目なので1を返す方が多くの場合、自然に思われる。 |
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私もこの問題で知ったのですがこういう「見た目の一文字」をグラフィムクラスタ(grapheme cluster)とか書記素クラスタと呼ぶみたいですね。Javaでグラフィムクラスタを扱うライブラリがあるか調べてみてもよいかもしれません。
また以下のnoteも参考になりました、よければご覧ください。
https://note.com/ttuusskk/n/n1bff5d8e638c
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グラフィムクラスタ(grapheme cluster)という名前なのですね。
調べてみたらjava20から標準的なライブラリ(java.text. BreakIterator)でグラフィムクラスタに対応した文字数を確認できるようです。
https://bugs.openjdk.org/browse/JDK-8292992
そのほか、正規表現で文字間をマッチするという手段もあるようでした。
https://www.hos.co.jp/blog/20211122/
JavaではJava9から正規表現に任意のUnicode拡張書記素クラスタにマッチする「\X」とUnicode拡張書記素クラスタ境界にマッチする「\b{g}」が導入されました。
| ```java | ||
| class Solution { | ||
| public int firstUniqChar(String s) { | ||
| Map<Character, Integer> charToFoundCount = new HashMap<>(); |
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charToCountでも伝わりそうなので私だったらそうするかもしれません。今のままでも読みやすいので好みかなと思います。
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今回解いた問題：
387. First Unique Character in a String
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560. Subarray Sum Equals K