This problem is in Contest(s) below:
Contest 1616:NJ24春季信息学奥赛-9
Contest 1703:25寒假信奥提高1
Contest 1747:25春季信奥编程入门27
Contest 1546:NJ23秋季信息学奥赛提高-11
Contest 1547:NJ23秋季信息学奥赛基础-12
Contest 1698:24秋季信奥提高7
Contest 1576:NJ24春季信息学奥赛提高-2