Thank your for participation

Problem D2A (New Building) was authored and prepared by Burunduk2.

Problem D2B (Badge) was authored and prepared by me, the version in SIS's olympiad contained the version with n ≤ 10⁵.

Problem D1A (Elections), D1B (Hat), D1D (Large Triangle) were authored by achulkov2, with D1A prepared by Schemtschik, D1B by achulkov2 and D1D prepared by achulkov2 and craborac.

Problem D1C (Sergey's Problem) was authored and prepared by Morokei.

Problem D1E (Raining Season) was authored and prepared by izban.

Editorials were written by izban and VArtem