SA模板

 1 #include<cstdio>
 2 #include<algorithm>
 3 #include<cstring>
 4 using namespace std;
 5 const int M=100010;
 6 char S[M];
 7 int n,i,s[M],sa[M],wa[M],wb[M],wc[M],wd[M],height[M],rank[M];
 8 bool cmp(int *r,int a,int b,int l){return r[a]==r[b]&&r[a+l]==r[b+l];}
 9 void getsa(int *r,int *sa,int n,int m){
10     int *x=wa,*y=wb,j,p;
11     for (i=0;i<n;i++)wc[x[i]=r[i]]++;
12     for (i=1;i<m;i++)wc[i]+=wc[i-1];
13     for (i=n-1;i>=0;i--)sa[--wc[x[i]]]=i;
14     for (j=1,p=1;p<n;j*=2,m=p){
15         p=0;
16         for (i=n-j;i<n;i++)y[p++]=i;
17         for (i=0;i<n;i++)if (sa[i]>=j)y[p++]=sa[i]-j;
18         for (i=0;i<n;i++)wd[i]=x[y[i]];
19         for (i=0;i<m;i++)wc[i]=0;
20         for (i=0;i<n;i++)wc[wd[i]]++;
21         for (i=1;i<m;i++)wc[i]+=wc[i-1];
22         for (i=n-1;i>=0;i--)sa[--wc[wd[i]]]=y[i];
23         swap(x,y);p=1;x[sa[0]]=0;
24         for (i=1;i<n;i++)x[sa[i]]=cmp(y,sa[i-1],sa[i],j)?p-1:p++;
25     }
26 }
27 void getheight(int *r,int *sa,int n){
28     int i,j,k=0;
29     for (i=1;i<=n;i++)rank[sa[i]]=i;
30     for (i=0;i<n;height[rank[i++]]=k){
31         if(k)k--;
32         j=sa[rank[i]-1];
33         while(r[i+k]==r[j+k])k++;
34     }
35 }
36 int main(){
37     scanf("%s",S);
38     n=strlen(S);
39     for (i=0;i<n;i++)s[i]=S[i]-‘a‘+1;
40     s[n]=0;
41     getsa(s,sa,n+1,100);
42     getheight(s,sa,n);
43     for (i=1;i<=n;i++)printf("%d ",sa[i]+1);puts("");
44     for (i=2;i<=n;i++)printf("%d ",height[i]);puts("");
45 }