规则Rules：
标准数独基础上，每个虚线框内数字不重复，角标是框内数字之和。
Classic rules applied. Additionally, numbers cannot repeat in each cage, clue is the sum of the numbers.
◆例题 Example
◆在线涂鸦 Draw it Online
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
