规则Rules：
标准数独基础上，不等号展示了相邻两格的大小关系。
Classic rules applied. Additionally, ＞ and ＜ shows the larger number around it.
◆例题 Example
◆在线涂鸦 Draw it Online
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
