bzoj 2555
暴力。
收获：
1、第一道后缀自动机，大概知道怎么写了，有一些原理性的东西还要理解。
2、计算right集合的大小
1 /************************************************************** 2 Problem: 2555 3 User: idy002 4 Language: C++ 5 Result: Accepted 6 Time:4708 ms 7 Memory:143072 kb 8 ****************************************************************/ 9 10 #include <cstdio> 11 #include <cstring> 12 #include <iostream> 13 #define fprintf(...) 14 #define N 1200010 15 using namespace std; 16 17 int n, m; 18 char buf[N]; 19 int aa[N], mask; 20 int son[N][26], par[N], val[N], siz[N], last, root, ntot; 21 22 int newnode( int v ) { 23 int nd=++ntot; 24 val[nd] = v; 25 return nd; 26 } 27 void init() { 28 root = last = newnode(0); 29 siz[root] = 1; 30 } 31 void append( int c ) { 32 int p=last; 33 int np=newnode( val[p]+1 ); 34 for( ; p && !son[p][c]; p=par[p] ) son[p][c] = np; 35 if( p==0 ) { 36 par[np] = root; 37 } else { 38 int q = son[p][c]; 39 if( val[q]==val[p]+1 ) { 40 par[np] = q; 41 } else { 42 int nq = newnode( val[p]+1 ); 43 memcpy( son[nq], son[q], sizeof(son[nq]) ); 44 par[nq] = par[q]; 45 siz[nq] = siz[q]; 46 par[np] = par[q] = nq; 47 for( ; p && son[p][c]==q; p=par[p] ) son[p][c]=nq; 48 } 49 } 50 last = np; 51 for( ; np; np=par[np] ) ++siz[np]; 52 } 53 void append( const char *T ) { 54 fprintf( stderr, "append( %s )\n", T ); 55 for( ; *T; T++ ) 56 append( *T-'A' ); 57 } 58 void decode( int mask ) { 59 fprintf( stderr, "%d\n", mask ); 60 int n = strlen(buf); 61 for( int j=0; j<n; j++ ) { 62 mask = (mask*131+j)%n; 63 swap( buf[j], buf[mask] ); 64 } 65 } 66 int query( const char *T ) { 67 fprintf( stderr, "query( %s )\n", T ); 68 int n=strlen(T); 69 int u=root; 70 for( int i=0; i<n; i++ ) { 71 int c=T[i]-'A'; 72 if( !son[u][c] ) return 0; 73 u=son[u][c]; 74 } 75 return siz[u]; 76 } 77 int main() { 78 scanf( "%d", &m ); 79 scanf( "%s", buf ); 80 init(); 81 append( buf ); 82 for( int i=1; i<=m; i++ ) { 83 char ch[10]; 84 scanf( "%s%s", ch, buf ); 85 decode(mask); 86 if( ch[0]=='A' ) { 87 append(buf); 88 } else { 89 int ans = query(buf); 90 printf( "%d\n", ans ); 91 mask ^= ans; 92 } 93 } 94 }
