hnu11187

AC自动机+DP

#include 
#include 
#include 
using namespace std;

#define D(x) 

const int MAX_D_LEN = 25;
const int MAX_LEN = 88;
const int MAX_N = 105;
const int MAX_CHILD_NUM = 128;
const int MAX_NODE_NUM = MAX_N * MAX_D_LEN;
const int INF = 0x3f3f3f3f;

char dna[MAX_LEN];

struct Trie
{
    int next[MAX_NODE_NUM][MAX_CHILD_NUM];
    int fail[MAX_NODE_NUM];
    bool disease[MAX_NODE_NUM];
    int node_cnt;
    bool vis[MAX_NODE_NUM]; //set it to false
    int root;
    int dp[MAX_LEN][MAX_NODE_NUM];

    void init()
    {
        node_cnt = 0;
        root = newnode();
        memset(vis, 0, sizeof(vis));
    }

    int newnode()
    {
        for (int i = 0; i < MAX_CHILD_NUM; i++)
            next[node_cnt][i] = -1;
        disease[node_cnt++] = false;
        return node_cnt - 1;
    }

    int get_id(char a)
    {
        return (int)a;
    }

    void insert(char buf[])
    {
        int now = root;
        for (int i = 0; buf[i]; i++)
        {
            int id = get_id(buf[i]);
            if (next[now][id] == -1)
                next[now][id] = newnode();
            now = next[now][id];
        }
        disease[now] = true;
    }

    void build()
    {
        queue<int>Q;
        fail[root] = root;
        for (int i = 0; i < MAX_CHILD_NUM; i++)
            if (next[root][i] == -1)
                next[root][i] = root;
            else
            {
                fail[next[root][i]] = root;
                Q.push(next[root][i]);
            }
        while (!Q.empty())
        {
            int now = Q.front();
            Q.pop();
            for (int i = 0; i < MAX_CHILD_NUM; i++)
                if (next[now][i] == -1)
                    next[now][i] = next[fail[now]][i];
                else
                {
                    fail[next[now][i]]=next[fail[now]][i];
                    if (disease[fail[next[now][i]]])
                        disease[next[now][i]] = true;
                    Q.push(next[now][i]);
                }
        }
    }

    int work(char* dna)
    {
        int len = strlen(dna);
        for (int i = 0; i < node_cnt; i++)
        {
            if (disease[i])
                dp[len][i] = INF;
            else
                dp[len][i] = 0;
        }
        for (int i = len - 1; i >= 0; i--)
        {
            int key = get_id(dna[i]);
            for (int j = 0; j < node_cnt; j++)
            {
                if (disease[j])
                    continue;
                dp[i][j] = dp[i + 1][root] + 1;
                int v = next[j][key];
                if (disease[v])
                    continue;
                dp[i][j] = min(dp[i][j], dp[i + 1][v]);
            }
        }
        return dp[0][root];
    }

    void debug()
    {
        for(int i = 0;i < node_cnt;i++)
        {
            printf("id = %3d,fail = %3d,end = %3d,chi = [",i,fail[i],disease[i]);
            for(int j = 0;j < MAX_CHILD_NUM;j++)
                printf("%2d",next[i][j]);
            printf("]\n");
        }
    }
}ac;

int n, m;
char st[MAX_LEN];

int main()
{
    while (scanf("%d %d", &n, &m), n | m)
    {
        ac.init();
        for (int i = 0; i < n; i++)
        {
            scanf("%s", st);
            getchar();
            ac.insert(st);
        }
        ac.build();
        int ans = 0;
        for (int i = 0; i < m; i++)
        {
            gets(st);
            ans += ac.work(st);
        }
        printf("%d\n", ans);
    }
    return 0;
}

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转载于:https://www.cnblogs.com/rainydays/p/4363967.html