bzoj2946

题解：

和poj1226差不多

把翻转去掉

然后不要忘记开大数组和二分的上限答案

代码：

#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
const int N=;
char str[N];
int r[N],len,n,t,Index[N],Rank[N],height[N],sa[N],wa[N],wb[N],wv[N],WS[N];
int cmp(int *r,int a,int b,int l)
{
    return r[a]==r[b]&&r[a+l]==r[b+l];
}
void da(int *r,int *sa,int n,int m)
{
    int p,*x=wa,*y=wb,*t;
    for (int i=;i<m;i++)WS[i]=;
    for (int i=;i<n;i++)WS[x[i]=r[i]]++;
    for (int i=;i<m;i++)WS[i]+=WS[i-];
    for (int i=n-;i>=;i--)sa[--WS[x[i]]]=i;
    for (int j=,p=;p<n;j*=,m=p)
     {
         p=;
        for (int i=n-j;i<n;i++)y[p++]=i;
        for (int i=;i<n;i++)
         if (sa[i]>=j)y[p++]=sa[i]-j;
        for (int i=;i<n;i++)wv[i]=x[y[i]];
        for (int i=;i<m;i++)WS[i]=;
        for (int i=;i<n;i++)WS[wv[i]]++;
        for (int i=;i<m;i++)WS[i]+=WS[i-];
        for (int i=n-;i>=;i--)sa[--WS[wv[i]]]=y[i];
        t=x,x=y,y=t,p=,x[sa[]]=;
        for (int i=;i<n;i++)
         x[sa[i]]=cmp(y,sa[i-],sa[i],j)?p-:p++;
     }
    return;
}
void calheight(int *r,int *sa,int n)
{
    int k=;
    for (int i=;i<=n;i++)Rank[sa[i]]=i;
    for (int i=;i<n;height[Rank[i++]]=k)
     {
         k?k--:;
         for (int j=sa[Rank[i]-];r[i+k]==r[j+k];k++);
     }
    return;
}
int check(int x)
{
    set<int>se;
    for (int i=;i<len;i++)
     {
        if (height[i]>=x)
         {
            se.insert(Index[sa[i]]);
            se.insert(Index[sa[i-]]);
         }
        else
         {
            if (se.size()==n)return ;
            se.clear();
         }
     }
    if (se.size()==n)return ;
    return false;
}
void solve()
{
    int L=,R=,ans=;
    while (R>=L)
     {
        int mid=(L+R)/;
        if (check(mid))
         {
            ans=mid;
            L=mid+;
         }
        else R=mid-;
     }
    printf("%d\n",ans);
}
int main()
{
    scanf("%d",&n);
    for (int i=,val=;i<=n;i++)
     {
        scanf("%s",&str);
        for (int j=;j<strlen(str);j++)
         {
            Index[len]=i;
            r[len++]=(str[j]-'a'+*n+);
         }
        Index[len]=i;
        r[len++]=val++;
     }
    da(r,sa,len,);
    calheight(r,sa,len-);
    solve();
    return ;
}