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  • 【模板】后缀数组

    #include <cstdio>
    #include <iostream>
    #include <cstring>
    #define  LL long long
    #define  ULL unsigned long long
    using namespace std;
    const int MAXN=100010;
    //以下为倍增算法求后缀数组 
    int wa[MAXN],wb[MAXN],wv[MAXN],Ws[MAXN];
    int cmp(int *r,int a,int b,int l)
    {return r[a]==r[b]&&r[a+l]==r[b+l];}
    /**< 传入参数:str,sa,len+1,ASCII_MAX+1 */ 
    void da(const char r[],int sa[],int n,int m)
    {
          int i,j,p,*x=wa,*y=wb,*t; 
          for(i=0; i<m; i++) Ws[i]=0;
          for(i=0; i<n; i++) Ws[x[i]=r[i]]++;//以字符的ascii码为下标 
          for(i=1; i<m; i++) Ws[i]+=Ws[i-1];
          for(i=n-1; i>=0; i--) sa[--Ws[x[i]]]=i;
          /*cout<<"SA"<<endl;;
          for(int i=0;i<n+1;i++)cout<<sa[i]<<' ';*/
          for(j=1,p=1; p<n; j*=2,m=p)
          {
                for(p=0,i=n-j; i<n; i++) y[p++]=i; 
                for(i=0; i<n; i++) if(sa[i]>=j) y[p++]=sa[i]-j;
                for(i=0; i<n; i++) wv[i]=x[y[i]];
                for(i=0; i<m; i++) Ws[i]=0;
                for(i=0; i<n; i++) Ws[wv[i]]++;
                for(i=1; i<m; i++) Ws[i]+=Ws[i-1];
                for(i=n-1; i>=0; i--) sa[--Ws[wv[i]]]=y[i];
                for(t=x,x=y,y=t,p=1,x[sa[0]]=0,i=1; i<n; i++)
                      x[sa[i]]=cmp(y,sa[i-1],sa[i],j)?p-1:p++;
          }
          return;
    }
    int sa[MAXN],Rank[MAXN],height[MAXN];
    //求height数组
    /**< str,sa,len */
    void calheight(const char *r,int *sa,int n)
    {
          int i,j,k=0;
          for(i=1; i<=n; i++) Rank[sa[i]]=i;
          for(i=0; i<n; height[Rank[i++]]=k)
                for(k?k--:0,j=sa[Rank[i]-1]; r[i+k]==r[j+k]; k++);
          // Unified
          for(int i=n;i>=1;--i) ++sa[i],Rank[i]=Rank[i-1];
    }
    
    char str[MAXN];
    int main()
    {
          while(scanf("%s",str)!=EOF)
          {
                int len=strlen(str);
                da(str,sa,len+1,130);
                calheight(str,sa,len);
                puts("--------------All Suffix--------------");
                for(int i=1; i<=len; ++i)
                {
                      printf("%d:	",i);
                      for(int j=i-1; j<len; ++j)
                            printf("%c",str[j]);
                      puts("");
                }
                puts("");
                puts("-------------After sort---------------");
                for(int i=1; i<=len; ++i)
                {
                      printf("sa[%2d ] = %2d	",i,sa[i]);
                      for(int j=sa[i]-1; j<len; ++j)
                            printf("%c",str[j]);
                      puts("");
                }
                puts("");
                puts("---------------Height-----------------");
                for(int i=1; i<=len; ++i)
                      printf("height[%2d ]=%2d 
    ",i,height[i]);
                puts("");
                puts("----------------Rank------------------");
                for(int i=1; i<=len; ++i)
                      printf("Rank[%2d ] = %2d
    ",i,Rank[i]);
                puts("------------------END-----------------");
          }
          return 0;
    }
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  • 原文地址:https://www.cnblogs.com/ww123/p/11122325.html
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