Note: problems were selected from the following contest:
- Nordic Collegiate Programming Contest 2021
- The 2021 Benelux Algorithm Programming Contest / United Kingdom and Ireland Programming Contest 2021
- CTU Open Contest 2021
The title of the problems has been changed, so please use the ID (A, B, etc.) to identify the problem.
注意:题目是从以下比赛中选择的:
- Nordic Collegiate Programming Contest 2021
- The 2021 Benelux Algorithm Programming Contest / United Kingdom and Ireland Programming Contest 2021
- CTU Open Contest 2021
题目的标题有所变化,所以请使用题目编号(如 A, B 等)来辨别题目。