Petrozavodsk Programming Camp Winter 2020 Day 4: Yandex Cup 2020

	#	Title
A	18501	Y-Shaped Knife
B	18502	Bad Doctor
C	18503	Topological Ordering
D	18504	Bracket Euler Tour
E	18505	Tree of Charge
F	18506	Find a Tree
G	18507	One Root
H	18508	Delete the Points
I	18509	Hard Times for Your Data
J	18510	Program