Codeforces Round 750 (Div. 2) F2. Korney Korneevich and XOR (hard version)
Codeforces Round 750 (Div. 2) F1. Korney Korneevich and XOR (easy version)
Technocup 2022 - Elimination Round 1 D. Omkar and the Meaning of Life
Codeforces Round 756 (Div. 3) F. ATM and Students
Codeforces Round 761 (Div. 2) D2. Too Many Impostors (hard version)
Codeforces Round 761 (Div. 2) D1. Too Many Impostors (easy version)
C - 天下一文字列集合
D - 無刻印キーボード
C - 天下一王国の歴史
B - 高橋君と禁断の書