Hello everyone, this is my first contest, and now it is loaded on the gym.

It was used as 2022 Nowcoder Summer Camp, Day 8 and 2022 Petrozavodsk Summer Camp, Day 6.

All problems are prepared by me. Thanks

• jiangly for the idea of the problem C;
• lzr_010506 for reviewing the problems;
• Suika_predator for the solution of the problem L;
• Gassa for fixing the statements of the problems;
• MikeMirzayanov for Codeforces and Polygon;
• and all testers including 1zhuxiaobaicai, 20203246, 20km_shimakaze, All_Forward, AyoAyowei, DF_Pite, BruceW_07, gg_b0nd, Colorless, DFS_lover, Eden_CY, Frank_DD, GCCCCCCC, HorizonWind, Huah, Iamonlytupids, LKC314, apeiya, Lavine, Makaveli, jqdai0815, Onozuka, PM250, PaperCloud, Pcjmy, RDDCCD, Randias, Rebelz, Roundgod, Rtx_, SSerxhs, The_Crossing, Tian_chen, Weierstrass, _ChenKerui, _ZLQ, acwing_lindi530, jzz2.0, zzzgw, gouzhiqishi77, buns_out, cultu, dgklr, dyxg, emofunc, fr200110217102, fzx, gym580299, hjejeje, kimoyami, lukelin, nhc, no_power, oipotato, pikabi, playf, qiqi20021026, Rewinding, stepsys, tarjen, triple__a, xuqijie, destination, yzyyylx, woruo27, and so on.

Hope you enjoy the problems and feel free to discuss them in the comments.