Forbidden

https://juppy.hatenablog.com/entry/2019/03/17/AGC031_-_A_Colorful_Subsequence_%252C_B_Reversi_-_Python_%25E7%25AB%25B6%25E6%258A%2580%25E3%2583%2597%25E3%2583%25AD%25E3%2582%25B0%25E3%2583%25A9%25E3%2583%259F%25E3%2583%25B3%25E3%2582%25B0_Atcoder は非公開に設定されています。