【Ynoi2018】五彩斑斓的世界
【AtCoder Regular Contest 075 F】Mirrored
【AtCoder Regular Contest 075 E】Meaningful Mean
【AtCoder Regular Contest 074 F】Lotus Leaves
【洛谷P6177】Count on a tree II
【AtCoder Regular Contest 073 F】Many Moves
【AtCoder Regular Contest 072 F】Dam
【AtCoder Regular Contest 072 E】Alice in linear land
【AtCoder Regular Contest 071 F】Infinite Sequence
【AtCoder Regular Contest 071 E】TrBBnsformBBtion