1 #include<stdio.h>
2 #include<string.h>
3 int ch[50005][100],sz=1,val[50005];
4 char s[50005][105];
5 void insert(char *s)
6 {
7 int i,u=0,len=strlen(s),c;
8 for (i=0;i<len;i++)
9 {
10 c=s[i]-'a';
11 if (ch[u][c]==0)
12 {
13 memset(ch[sz],0,sizeof(ch[sz]));
14 val[sz]=0;
15 ch[u][c]=sz;
16 sz++;
17 }
18 u=ch[u][c];
19 }
20 val[u]=1;
21 }
22 int main()
23 {
24 int sum=0,i,j,u,c,d,judge,judge1,len;
25 memset(ch[0],0,sizeof(ch[0]));
26 while (gets(s[sum+1])/*&&s[sum+1][0]!='!'*/) { sum++; insert(s[sum]); }
27 for (i=1;i<=sum;i++)
28 {
29 len=strlen(s[i]); judge1=0;
30 for (j=0;j<=len-2;j++)
31 {
32 judge=1;
33 u=0; d=0; c=s[i][d]-'a';
34 while (ch[u][c]!=0&&d<=j) {u=ch[u][c]; d++; c=s[i][d]-'a';}
35 if (d!=j+1||val[u]==0) judge=0;
36 if (judge==1)
37 {
38 u=0; c=s[i][d]-'a';
39 while (ch[u][c]!=0&&d<len) {u=ch[u][c]; d++; c=s[i][d]-'a';}
40 if (d!=len||val[u]==0) judge=0;
41 }
42 if (judge==1) judge1=1;
43 }
44 if (judge1==1) printf("%s\n",s[i]);
45 }
46 return(0);
47 }
http://acm.hdu.edu.cn/showproblem.php?pid=1247
