ICPC 2018 World Finals（Codeforces Gym 102482）部分题目的题解：
A. Catch the Plane
B. Comma Sprinkler
E. Getting a Jump on Crime
H. Single Cut of Failure
I. Triangles

CCPC 2023 Final 部分题目的题解：
A. Add One 2
C. Colorful Graph 2
D. Min or Max
G. China Convex Polygon Contest
H. The Game
J. DFS Order 5
K. Sticks