OJ-Problems-Source/HDOJ/4511_autoAC.cpp
2016-09-06 13:32:33 +08:00

128 lines
3.2 KiB
C++

#include <stdio.h>
#include <string.h>
#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <stdlib.h>
#include <time.h>
using namespace std;
const double INF = 1e20;
int n;
pair<int,int> p[100];
double dis(pair<int,int>a,pair<int,int>b)
{
return sqrt((double)(1.0 * a.first - b.first) * (1.0 * a.first - b.first) + (double)(1.0 * a.second - b.second)*(1.0 * a.second - b.second));
}
double dp[55][1000];
void CheckMin(double &a,double b)
{
a = min(a,b);
}
struct Trie
{
int next[1000][55],fail[1000],end[1000];
int root,L;
int newnode()
{
for(int i = 1; i <= n;i++)
next[L][i] = -1;
end[L++] = 0;
return L-1;
}
void init()
{
L = 0;
root = newnode();
}
void insert(int a[],int cnt)
{
int now = root;
for(int i = 0;i < cnt;i++)
{
if(next[now][a[i]] == -1)
next[now][a[i]] = newnode();
now = next[now][a[i]];
}
end[now] = 1;
}
void build()
{
queue<int>Q;
fail[root] = root;
for(int i = 1;i <= n;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();
end[now] |= end[fail[now]];
for(int i = 1;i <= n;i++)
if(next[now][i] == -1)
next[now][i] = next[fail[now]][i];
else
{
fail[next[now][i]] = next[fail[now]][i];
Q.push(next[now][i]);
}
}
}
void solve()
{
for(int i = 1;i <= n;i++)
for(int j = 0;j < L;j++)
dp[i][j] = INF;
dp[1][next[root][1]] = 0;
for(int i = 1;i < n;i++)
for(int j = 0;j < L;j++)
if(dp[i][j] < INF)
{
for(int k = i+1;k <= n;k++)
{
int ss = next[j][k];
if(end[ss])continue;
CheckMin(dp[k][ss],dp[i][j] + dis(p[i],p[k]));
}
}
double ans = INF;
for(int i = 0;i < L;i++)
if(dp[n][i] < INF)
CheckMin(ans,dp[n][i]);
if(ans == INF)printf("Can not be reached!\n");
else printf("%.2f\n",ans);
}
}ac;
int a[10];
int main()
{
int m;
while(scanf("%d%d",&n,&m) == 2)
{
if(n == 0 && m == 0)break;
for(int i = 1;i <= n;i++)
scanf("%d%d",&p[i].first,&p[i].second);
ac.init();
int k;
while(m--)
{
scanf("%d",&k);
for(int i = 0;i < k;i++)
scanf("%d",&a[i]);
ac.insert(a,k);
}
ac.build();
ac.solve();
}
return 0;
}