单双岸型问题公式简介：Su Can suddenly remembered that Luo Xi seemed to have a birthday today. Fortunately, when he went out in the morning, he told his parents that he would not go home for dinner, otherwise they would have to wait for me to eat again.
Su Can suddenly remembered that Luo Xi seemed to have a birthday today. Fortunately, when he went out in the morning, he told his parents that he would not go home for dinner, otherwise they would have to wait for me to eat again.
