对0-9的每个数字i，统计文件中出现在i之前的数字和出现在i之后的数字，分别用pre[i]和post[i]表示，结果如下：
$$
\begin{matrix}
digit & pre & post \\
0 & [1, 2, 3, 6, 7, 8, 9] & [] \\
1 & [3, 7] & [0, 2, 6, 8, 9] \\
2 & [1, 3, 6, 7] & [0, 8, 9] \\
3 & [7] & [0, 1, 2, 6, 8, 9] \\
4 & [] & [] \\
5 & [] & [] \\
6 & [1, 3, 7] & [0, 2, 8, 9] \\
7 & [] & [0, 1, 2, 3, 6, 8, 9] \\
8 & [1, 2, 3, 6, 7] & [0, 9] \\
9 & [1, 2, 3, 6, 7, 8] & [0] \\
\end{matrix}
$$
对表中数据拓扑排序后不难看出结果是$73162890$。
s=[]
with open("079_keylog.txt") as f:
for line in f:
s.append(line.strip())
t=sorted(list(set(s)))
d=[[[],[]] for i in range(10)]
for x in t:
a,b,c=map(int,x)
d[a][1].append(b)
d[a][1].append(c)
d[b][1].append(c)
d[b][0].append(a)
d[c][0].append(a)
d[c][0].append(b)
for i in range(10):
print i," pre:",sorted(list(set(d[i][0])))," post", sorted(list(set(d[i][1])))
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