「UVA644」 Immediate Decodability（Trie

 1 /*
 2     qwerta
 3     UVA644 Immediate Decodability
 4     Accepted
 5     代码 C++，0.99KB
 6     提交时间 2018-10-19 15:04:58
 7     耗时/内存
 8     50ms, 0KB
 9 */
10 #include<algorithm>
11 #include<iostream>
12 #include<cstring>
13 #include<cstdio>
14 using namespace std;
15 string s[11];
16 bool cmp(string qaq,string qwq){
17     return qaq.length()<qwq.length();
18 }
19 struct emm{
20     int nxt[2],tag;
21 }a[83];
22 int main()
23 {
24     //freopen("a.in","r",stdin);
25     int t=0;
26     while(++t&&cin>>s[1])
27     {
28         int n=1;
29         do{if(s[n][0]==‘9‘)break;
30         }while(cin>>s[++n]);
31         n--;
32         sort(s+1,s+n+1,cmp);
33         int cnt=0;
34         memset(a,0,sizeof(a));
35         int flag=0;
36         for(int c=1;c<=n&&!flag;++c)
37         {
38             int k=0;
39             for(int i=0;i<s[c].length();++i)
40             {
41                 if(!a[k].nxt[s[c][i]-‘0‘])
42                   a[k].nxt[s[c][i]-‘0‘]=++cnt;
43                 k=a[k].nxt[s[c][i]-‘0‘];
44                 if(a[k].tag)flag++;
45             }
46             a[k].tag=1;
47         }
48         if(!flag)
49           printf("Set %d is immediately decodable\n",t);
50         else
51           printf("Set %d is not immediately decodable\n",t);
52     }
53     return 0;
54 }