9A = 9 * 16 + 10 = 154
232 = 2 * 64 + 26 = 128 + 26 = 154
左根右

4 + 3 + 2 + 1

C
B
A

AAABBBCCC
长度为1：A B C 3
2：AA AB BB BC CC 5
3：AAA AAB ABB BBB BBC BCC CCC 7
4：AAAB AABB ABBB BBBC BBCC BCCC 6
5：AAABB AABBB ABBBC BBBCC BBCCC 5
6：AAABBB AABBBC ABBBCC BBBCCC 4
7：AAABBBC AABBBCC ABBBCCC 3
8：AAABBBCC AABBBCCC 2
9: AAABBBCCC 1