This problem is in Contest(s) below:
Contest 1184:2022秋周六早c++8期
Contest 1191:2022秋周日下c++8期
Contest 1219:2023春周日早c++3期(塘下)
Contest 1221:2023春周日c++三期
Contest 1173:2022秋周六下c++第三期
Contest 1171:2022秋周五晚c++第三期
Contest 1174:2022秋周日上c++第三期(平阳)
Contest 1208:2023春季周六早c++五期
Contest 1242:2023暑期C++c2
Contest 1359:2024暑期37下c++2(平阳)
Contest 1224:2023春周日晚C++二期(快)