lecture
lecture_10特殊的数(编辑修改稿)
6/30 35 2. 加括号的方式数目 3 numbers: (1 (2 3)) ((1 2) 3) 4 numbers: (1 (2 (3 4))) (1 ((2 3) 4)) ((1 2) (3 4)) ((1 (2 3)) 4) (((1 2) 3) 4) 2020/6/30 36 (1 (2 (3 (4 5)))) (1 (2 ((3 4) 5))) (1 ((2 3) (4 5)))