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1 #include <cstdio>
2 #include <cstring>
3
4 const int sonnum = 26;
5 char word[120005][30];
6 struct trie
7 {
8 bool term;
9 struct trie *son[sonnum];
10 };
11
12 trie* create_trie()
13 {
14 trie *temp = new trie;
15 temp -> term = false;
16 for(int i = 0;i <sonnum;i++)
17 {
18 temp -> son[i] =NULL;
19 }
20
21 return temp;
22 }
23
24 void insert_word(trie *pnt,char s[],int len)
25 {
26 trie *temp = pnt;
27 for(int i = 0;i <len;i++)
28 {
29 if(temp -> son[s[i] - 'a'] == NULL)
30 temp -> son[s[i] - 'a'] = create_trie();
31 temp = temp -> son[s[i] - 'a'];
32 }
33 temp -> term = true;
34 }
35
36 bool find(trie *pnt ,char s[],int len)
37 {
38 trie *temp = pnt;
39 for(int i = 0;i <len ;i ++)
40 {
41 if(temp -> son[s[i] - 'a'] == NULL)
42 return false;
43 temp = temp -> son[s[i] - 'a'];
44 }
45
46 if(temp -> term)
47 return true;
48 return false;
49 }
50
51 int main()
52 {
53 int n = 0;
54 trie *t = create_trie();
55 while(scanf("%s",word[n]) == 1)
56 {
57 insert_word(t,word[n],strlen(word[n]));
58 n ++;
59 }
60
61 for(int i = 0;i < n;i ++)
62 {
63 char s1[30],s2[30];
64 int len = strlen(word[i]);
65 for(int j = 1;j < len ;j ++)
66 {
67 int k;
68 for(k = 0;k < j;k ++)
69 {
70 s1[k] = word[i][k];
71 }
72 s1[k] = '\0';
73
74 for(k = j;k < len;k ++)
75 {
76 s2[k-j] = word[i][k];
77 }
78 s2[k-j] = '\0';
79 if(find(t,s1,strlen(s1))&&find(t,s2,strlen(s2)))
80 {
81 printf("%s\n",word[i]);
82 break;
83 }
84 }
85 }
86 return 0;
87 }
知道这一题可以用hash来做，但是我不会……~~~~(>_<)~~~~