HDU3065 病毒侵袭持续中

嘟嘟嘟

 

首先这就是一道AC自动机板儿题。

可能有重复的模板串情况,所以我每一个节点开一个vector,记录是第几个模板串的结尾。

对于主串,如果不是大写字母,就都默认是第26条出边('A' ~ 'Z' : 0 ~ 25)。

最后也是最重要的:题面不告诉你有多组数据。

  1 #include<cstdio>
  2 #include<iostream>
  3 #include<cmath>
  4 #include<algorithm>
  5 #include<cstring>
  6 #include<cstdlib>
  7 #include<cctype>
  8 #include<vector>
  9 #include<stack>
 10 #include<queue>
 11 using namespace std;
 12 #define enter puts("") 
 13 #define space putchar(' ')
 14 #define Mem(a, x) memset(a, x, sizeof(a))
 15 #define rg register
 16 typedef long long ll;
 17 typedef double db;
 18 const int INF = 0x3f3f3f3f;
 19 const db eps = 1e-8;
 20 const int maxn = 1e3 + 5;
 21 const int max_len = 2e6 + 5;
 22 inline ll read()
 23 {
 24     ll ans = 0;
 25     char ch = getchar(), last = ' ';
 26     while(!isdigit(ch)) {last = ch; ch = getchar();}
 27     while(isdigit(ch)) {ans = ans * 10 + ch - '0'; ch = getchar();}
 28     if(last == '-') ans = -ans;
 29     return ans;
 30 }
 31 inline void write(ll x)
 32 {
 33     if(x < 0) x = -x, putchar('-');
 34     if(x >= 10) write(x / 10);
 35     putchar(x % 10 + '0');
 36 }
 37 
 38 int n;
 39 char s[max_len], ss[maxn][55];
 40 int ans[maxn];
 41 
 42 int ch[maxn * 50][27], f[maxn * 50], cnt = 0;
 43 vector<int> val[maxn * 50];
 44 
 45 void init()
 46 {
 47   cnt = 0;
 48   Mem(ch[0], 0); val[0].clear(); f[0] = 0;
 49   Mem(ans, 0);
 50 }
 51 void insert(int id, char *s)
 52 {
 53   int len = strlen(s), now = 0;
 54   for(int i = 0; i < len; ++i)
 55     {
 56       int c = s[i] - 'A';
 57       if(!ch[now][c])
 58     {
 59       ch[now][c] = ++cnt;
 60       val[cnt].clear(); f[cnt] = 0;
 61       Mem(ch[cnt], 0);
 62     }
 63       now = ch[now][c];
 64     }
 65   val[now].push_back(id);
 66 }
 67 void build()
 68 {
 69   queue<int> q;
 70   for(int i = 0; i < 27; ++i) if(ch[0][i]) q.push(ch[0][i]);
 71   while(!q.empty())
 72     {
 73       int now = q.front(); q.pop();
 74       for(int i = 0; i < 27; ++i)
 75     {
 76       if(ch[now][i]) f[ch[now][i]] = ch[f[now]][i], q.push(ch[now][i]);
 77       else ch[now][i] = ch[f[now]][i];
 78     }
 79     }
 80 }
 81 int getnum(char c)
 82 {
 83   if(c >= 'A' && c <= 'Z') return c - 'A';
 84   else return 26;
 85 }
 86 void query(char *s)
 87 {
 88   int len = strlen(s), now = 0;
 89   for(int i = 0; i < len; ++i)
 90     {
 91       int c = getnum(s[i]); 
 92       now = ch[now][c];
 93       for(int j = now; j; j = f[j])
 94     for(int k = 0; k < (int)val[j].size(); ++k) ans[val[j][k]]++;
 95     }
 96 }
 97 
 98 int main()
 99 {
100   while(scanf("%d", &n) != EOF)
101     {
102       init();
103       for(int i = 1; i <= n; ++i)
104     {
105       scanf("%s", ss[i]);
106       insert(i, ss[i]);
107     }
108       build();
109       scanf("%s", s);
110       query(s);
111       for(int i = 1; i <= n; ++i) if(ans[i]) printf("%s: %d\n", ss[i], ans[i]);
112     }
113   return 0;
114 }
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posted @ 2018-10-11 09:42  mrclr  阅读(222)  评论(0编辑  收藏  举报