This problem is in Contest(s) below:
Contest 1050:C++编程训练9
Contest 1108:C++编程入门14
Contest 1116:C++编程入门16
Contest 1271:暑期C++入门集训5
Contest 1599:24春季C++编程入门4
Contest 1107:C++编程训练44
Contest 1124:ZWL-C++编程入门3
Contest 1712:2025寒假C++入门2
Contest 1717:2025春季C++入门2
Contest 1762:25春季C++零基础7
Contest 1201:Python实践训练
Contest 1590:24春季C++编程入门2
Contest 1750:25春季C++零基础5
Contest 1757:25春季C++零基础6
Contest 1758:2025春季C++入门9
Contest 1006:2020新沂一中信息学奥赛集训营0726
Contest 1149:C++编程入门23
Contest 1243:2022暑期C++编程训练-程序结构基础
Contest 1257:NJ暑期信息学编程集训1-综合复习
Contest 1289:2022秋季C++入门2