A.4 B.5 C.6 D.7
A.n+9 B.n+10 C.n+12 D.n+13
A.试探 B.递推 C.枚举 D.分析
A.左子树 B.右子树 C.左子树或没有右子树 D.兄弟
A.(B,F,G,J,A,D,I,E,H,C. B.(B,F,G,J,A,E,D,I,C,H) C.(A,B,D,C,E,F,I,J,G,H) D.(C,B,D,A,E,F,I,G,J,H)