规则Rules：
标准数独基础上，“凸”字格内数字大于其相邻单元格内数字，“凹”字格内数字小于其相邻单元格内数字。Classic rules applied. Additionally, in each cell with 凸, numbers must be larger than numbers adjacent to it; In each cell with 凹, numbers must be smaller than numbers adjacent to it.
◆在线做Do it by CTC
◆在线做Do it by Penpa
