规则Rules：
①填入1~7，使得每行、列内数字不重复（黑格不填数）。
②连续数数独规则：每一组连续的白色格内是一组连续数字（可能是乱序的）。
① Write 1~7, numbers cannot repeat in each Row or Column (no number in black cells).
② Rule of Renban: Numbers in each part of connected white cell form a group of consecutive numbers (may out of order).
