规则Rules：
标准数独基础上，每一条线条在它经过的每个宫内的每一段，数字之和相同。
Classic rules applied. Additionally, digits along each line have an equal sum within each Box it passes through.
◆例题 Example
◆在线涂鸦 Draw it Online
◆在线做 Do it by CTC
◆在线做 Do it by Penpa
