【BZOJ1966】[AHOI2005]病毒检测(动态规划)

【BZOJ1966】[AHOI2005]病毒检测(动态规划)

题面

BZOJ
洛谷

题解

我就蒯了一份代码随便改了改怎么就过了???
从这道题目蒯的
代码:

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<algorithm>
using namespace std;
#define MAX 505
#define ull unsigned long long
const int base=2333;
ull h1[MAX],h2[MAX],pw[MAX];
char ch[MAX],s[MAX];
int P[505],tot,n,m,ans;
bool f[505][MAX];
int main()
{
    scanf("%s",s+1);n=strlen(s+1)+1;s[n]='?';
    pw[0]=1;for(int i=1;i<MAX;++i)pw[i]=pw[i-1]*base;
    for(int i=1;i<=n;++i)h1[i]=h1[i-1]*base+s[i];
    for(int i=1;i<=n;++i)if(s[i]=='*'||s[i]=='?')P[++tot]=i;
    int T;scanf("%d",&T);
    while(T--)
    {
        memset(f,0,sizeof(f));f[0][0]=1;
        scanf("%s",ch+1);m=strlen(ch+1);ch[++m]='#';
        for(int i=1;i<=m;++i)h2[i]=h2[i-1]*base+ch[i];
        for(int j=0;j<=tot;++j)
        {
            if(s[P[j]]=='*')
                for(int i=1;i<=m;++i)f[j][i]|=f[j][i-1];
            for(int i=0;i<=m;++i)
            {
                if(!f[j][i])continue;
                int l1=i+1,r1=i+(P[j+1]-P[j])-1;
                int l2=P[j]+1,r2=P[j+1]-1;
                if(h2[r1]-h2[l1-1]*pw[r1-l1+1]==h1[r2]-h1[l2-1]*pw[r2-l2+1])
                {
                    if(s[P[j+1]]=='?')f[j+1][r1+1]|=f[j][i];
                    else f[j+1][r1]|=f[j][i];
                }
            }
        }
        ans+=f[tot][m]?0:1;
    }
    cout<<ans<<endl;
    return 0;
}

posted @ 2018-10-03 15:55  小蒟蒻yyb  阅读(254)  评论(0编辑  收藏  举报