坐在教室左上角的小名要传纸条纸条给坐在右下角的小红，中间每位同学只能帮忙传一次，且纸条只能向右或向下穿。(Sitting in the classroom, the upper left corner of the nickname to pass notes note to sit in the lower right corner of the red, the middle of each student can only help pass a note, and only the ri