最終更新日：2025/11/21
An inversion pair of a permutation σ is a pair of indices (i, j) with i < j and σ(i) > σ(j), and counting all such inversion pairs yields the inversion number.
正解を見る
An inversion pair of a permutation σ is a pair of indices (i, j) with i < j and σ(i) > σ(j), and counting all such inversion pairs yields the inversion number.
音声機能が動作しない場合はこちらをご確認ください
編集履歴（0）
