第四次作业
先把题目中的C（t）=5改成C（t）=4；
解.
C(a)=1,C(b)=2,C(r)=3,C(t)=4;
解码过程：
|
序列 |
输出 |
|
<0,0,3> |
r |
|
<0,0,1> |
ra |
|
<0,0,4> |
rat |
|
<2,8,2> |
ratatatatatb |
|
<3,1,2> |
ratatatatatbab |
|
<0,0,3> |
ratatatatatbabr |
|
<6,4,4,> |
ratatatatatbabratbat |
|
<9,5,4> |
ratatatatatbabratbatbabrat |
编码过程：
C(a)=1,C(b)=2,C(r)=3,C(t)=4;
输入序列：rat atatatatbabratbatbabrat，因为窗口的大小为20，先行缓冲区的大小为10，则编码缓冲区的大小为10;
则有：
|
输入 |
输出 |
|
||ratatatatatbabratbatbabrat |
<0,0,3> |
|
|r|atatatatatbabratbatbabrat |
<0,0,1> |
|
|ra|tatatatatbabratbatbabrat |
<0,0,4> |
|
|rat|atatatatbabratbatbabrat |
<2,8,2> |
|
ra|tatatatatb|abratbatbabrat |
<3,1,2> |
|
rata|tatatatbab|ratbatbabrat |
<0,0,3> |
|
ratat|atatatbabr|atbatbabrat |
<6,4,4> |
|
ratatatata|tbabratbat|babrat |
<9,5,4> |
解：由于接收序列为：4,5,3,1,2,8,2,7,9,7,4；
所以输入序列为：4,5,3,1,2,8,2,7,9,7,4
1）输入4
| 索引 | 条目 |
| 1 | S |
| 2 | _(空格) |
| 3 | I |
| 4 | T |
| 5 | H |
解码的序列为：T
P=T
2）输入5
| 索引 | 条目 |
| 1 | S |
| 2 | (空格) |
| 3 | I |
| 4 | T |
| 5 | H |
解码的序列为：TH
P=TH
3）输入3
| 索引 | 条目 |
| 1 | S |
| 2 | _(空格) |
| 3 | I |
| 4 | T |
| 5 | H |
| 6 | TH |
解码的序列为：THI
P=HI
4）输入1
| 索引 | 条目 |
| 1 | S |
| 2 | _ (空格) |
| 3 | I |
| 4 | T |
| 5 | H |
| 6 | TH |
| 7 | HI |
解码的序列为：THIS
P=IS
5）输入2
| 索引 | 条目 |
| 1 | S |
| 2 | _ (空格) |
| 3 | I |
| 4 | T |
| 5 | H |
| 6 | TH |
| 7 | HI |
| 8 | IS |
解码的序列为：THIS_
P=S_
6）输入8
| 索引 | 条目 |
| 1 | S |
| 2 | _ (空格) |
| 3 | I |
| 4 | T |
| 5 | H |
| 6 | TH |
| 7 | HI |
| 8 | IS |
| 9 | S_ |
解码的序列为：THIS_IS
P=_IS
7）输入2
| 索引 | 条目 |
| 1 | S |
| 2 | _ (空格) |
| 3 | I |
| 4 | T |
| 5 | H |
| 6 | TH |
| 7 | HI |
| 8 | IS |
| 9 | S_ |
| 10 | _I |
解码的序列为：THIS IS_
P=IS_
8）输入7
| 索引 | 条目 |
| 1 | S |
| 2 | _ (空格) |
| 3 | I |
| 4 | T |
| 5 | H |
| 6 | TH |
| 7 | HI |
| 8 | IS |
| 9 | S_ |
| 10 | _I |
| 11 | IS_ |
解码的序列为：THIS IS HI
P=_HI
9）输入9
| 索引 | 条目 |
| 1 | S |
| 2 | _ (空格) |
| 3 | I |
| 4 | T |
| 5 | H |
| 6 | TH |
| 7 | HI |
| 8 | IS |
| 9 | S_ |
| 10 | _I |
| 11 | IS_ |
| 12 | _H |
解码的序列为：THIS IS HIS_
P=HIS_
10）输入7
| 索引 | 条目 |
| 1 | S |
| 2 | _ (空格) |
| 3 | I |
| 4 | T |
| 5 | H |
| 6 | TH |
| 7 | HI |
| 8 | IS |
| 9 | S_ |
| 10 | _I |
| 11 | IS_ |
| 12 | _H |
| 13 | HIS |
解码的序列为：THIS IS HIS HI
P=S_HI
11）输入4
| 索引 | 条目 |
| 1 | S |
| 2 | _ (空格) |
| 3 | I |
| 4 | T |
| 5 | H |
| 6 | TH |
| 7 | HI |
| 8 | IS |
| 9 | S_ |
| 10 | _I |
| 11 | IS_ |
| 12 | _H |
| 13 | HIS |
| 14 | S_H |
解码的序列为：THIS IS HIS HIT
P=_HIT
| 索引 | 条目 |
| 1 | S |
| 2 | _ |
| 3 | I |
| 4 | T |
| 5 | H |
| 6 | TH |
| 7 | HI |
| 8 | IS |
| 9 | S_ |
| 10 | _I |
| 11 | IS_ |
| 12 | _H |
| 13 | HIS |
| 14 | S_H |
| T |
综上可得：解码的序列为THIS IS HIS HIT。
