规则Rules：
标准数独基础上，将任意格A的任意相邻格记为Ai。若对于所有的i，有A=Σ|A-Ai|，则将A格涂色，所有符合条件的A被全部涂色。
Classic rules applied. To any A in the grid, we set the cells adjacent to A is Ai. If A=Σ|A-Ai| in this cell, we colored it. All the possible A are marked.
◆例题 Example
◆在线涂鸦 Draw it Online
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
