bzoj 1031

 1 #include<bits/stdc++.h>
 2 #define inc(i,l,r) for(int i=l;i<=r;i++)
 3 #define dec(i,l,r) for(int i=l;i>=r;i--)
 4 #define link(x) for(edge *j=h[x];j;j=j->next)
 5 #define mem(a) memset(a,0,sizeof(a))
 6 #define inf 1e9
 7 #define ll long long
 8 #define succ(x) (1<<x)
 9 #define NM 200000+5
10 using namespace std;
11 int read(){
12     int x=0,f=1;char ch=getchar();
13     while(!isdigit(ch)){if(ch==‘-‘)f=-1;ch=getchar();}
14     while(isdigit(ch))x=x*10+ch-‘0‘,ch=getchar();
15     return x*f;
16 }
17 char st[NM];
18 int top[NM],rank[NM],sa[NM],tmp[NM],n,t,m;
19 void getsa(){
20     int j;m=256;
21     inc(i,0,n)top[rank[i]=(int)st[i]]++;
22     inc(i,1,m)top[i]+=top[i-1];
23     inc(i,0,n)sa[--top[rank[i]]]=i;
24 //    inc(i,0,n)printf("%d ",sa[i]);printf("\n");
25     for(int k=1;k<=n;k<<=1){
26         inc(i,0,n){
27             j=sa[i]-k;
28             if(j<0)j+=n+1;
29             tmp[top[rank[j]]++]=j;
30         }
31         sa[tmp[top[0]=0]]=j=0;
32 //        inc(i,0,n)printf("%d ",tmp[i]);printf("\n");
33         inc(i,0,n){
34             if(rank[tmp[i]]!=rank[tmp[i-1]]||rank[tmp[i]+k]!=rank[tmp[i-1]+k])
35             top[++j]=i;
36             sa[tmp[i]]=j;
37         }
38         memcpy(rank,sa,sizeof(sa));
39         memcpy(sa,tmp,sizeof(tmp));
40         if(j>=n)break;
41     }
42 }
43 int main(){
44     freopen("data.in","r",stdin);
45     scanf("%s",st);
46     t=strlen(st);
47     inc(i,0,t-1)st[i+t]=st[i];
48     n=strlen(st)-1;
49     getsa();
50     inc(i,0,n)
51     if(sa[i]<t)
52     printf("%c",st[sa[i]+t-1]);
53     printf("\n");
54     return 0;
55 }