【AtCoder Grand Contest 018 F】Two Trees
【AtCoder Grand Contest 009 E】Eternal Average
【AtCoder Grand Contest 025 D】Choosing Points
【AtCoder Grand Contest 032 C】Three Circuits
【AtCoder Grand Contest 035 C】Skolem XOR Tree
【AtCoder Grand Contest 037 E】Reversing and Concatenating
【AtCoder Grand Contest 030 C】Coloring Torus
【AtCoder Grand Contest 020 D】Min Max Repetition
【Codeforces 527E】Data Center Drama
【Codeforces 521E】Cycling City
