「loj - 3022」「cqoi 2017」老 C 的方块
link。good题,考虑像 国家集训队 - happiness 一样在棋盘上搞染色,我毛张 @shadowice1987 的图给你看啊你像这样奇数层以 red -> blue ->...
In mathematics you don't understand things, you just get used to them.
In mathematics you don't understand things, you just get used to them.