A.3, 5, 7, 9, 12, 10, 15, 1 B.3, 5, 9, 7, 12, 10, 15, 1 C.3, 7, 5, 9, 12, 10, 15, 1 D.3, 5, 7, 12, 9, 10, 15, 1
A.n B.n/2 C.log2n D.2n
A.1, 3, 5, 7, 9 B.9, 7, 5, 3, 1 C.5, 3, 1, 7, 9 D.5, 7, 9, 1, 3
A.n/2 B.n-1 C.n D.n+1
A.2 B.3 C.4 D.5