bzoj2555 substring(LCT 后缀自动机）

/*
动态求right集合的大小 
LCT维护parent树即可
注意 由于树是有向的不会换根并且每次操作单一， 于是不需要维护子树和（写起来很麻烦）
直接打标记修改即可 
*/

#include<cstdio>
#include<algorithm>
#include<iostream>
#include<cstring>
#include<queue>
#define ll long long 
#define M 1200010
#define mmp make_pair
using namespace std;
int read()
{
	int nm = 0, f = 1;
	char c = getchar();
	for(; !isdigit(c); c = getchar()) if(c == '-') f = -1;
	for(; isdigit(c); c = getchar()) nm = nm * 10 + c - '0';
	return nm * f;
}

int mask, ans;
struct Lct
{
	#define ls ch[x][0]
	#define rs ch[x][1]
	int ch[M][2], rev[M], ver[M], fa[M], s[M]; 
	bool isr(int x)
	{
		return ch[fa[x]][0] != x && ch[fa[x]][1] != x;
	}
	
	void up(int x, int vv)
	{
		ver[x] += vv;
		s[x] += vv;
	}

	void pushdown(int x)
	{
		if(s[x])
		{
			up(ls, s[x]);
			up(rs, s[x]);
			s[x] = 0; 
		}
	}
	
	void pd(int x)
	{
		if(!isr(x)) pd(fa[x]);
		pushdown(x); 
	}
	
	
	void rotate(int x)
	{
		int y = fa[x], q = fa[y];
		bool dy = (ch[y][1] == x), dz = (ch[q][1] == y);
		if(!isr(y)) ch[q][dz] = x;
		fa[x] = q;
		fa[ch[x][dy ^ 1]] = y;
		ch[y][dy] = ch[x][dy ^ 1];
		ch[x][dy ^ 1] = y;
		fa[y] = x;
	}
	
	void splay(int x)
	{
		pd(x);
		while(!isr(x))
		{
			int y = fa[x], q = fa[y];
			if(!isr(y))
			{
				if((ch[y][1] == x) ^ (ch[q][1] == y))
				{
					rotate(x);
				}
				else rotate(y);
			}
			rotate(x);
		}
	}
	
	void access(int x)
	{
		for(int y = 0; x; y = x, x = fa[x]) splay(x), rs = y;
	}
		
	void link(int x, int y)
	{
		fa[x] = y;
		access(y);
		splay(y);
		up(y, ver[x]);
	}
	
	void cut(int x)
	{
		access(x), splay(x), up(ls, -ver[x]), fa[ls] = 0, ls = 0;
	}
}T;
	
int ch[M][26], len[M], fa[M], lst = 1, cnt = 1;

void insert(int c)
{
	int p = ++cnt, f = lst;
	lst = p;
	len[p] = len[f] + 1;
	T.ver[p] = 1;
	while(f && !ch[f][c]) ch[f][c] = p, f = fa[f];
	if(!f)
	{
		fa[p] = 1;
		T.link(p, 1);
	}
	else
	{
		int q = ch[f][c];
		if(len[q] == len[f] + 1)
		{
			T.link(p, q);
			fa[p] = q;
		}
		else
		{
			int nq = ++cnt;
			len[nq] = len[f] + 1;
			memcpy(ch[nq], ch[q], sizeof(ch[nq]));
			fa[nq] = fa[q];
			T.link(nq, fa[q]);
			fa[q] = fa[p] = nq;
			T.cut(q);
			T.link(q, nq);
			T.link(p, nq);
			while(f && ch[f][c] == q) ch[f][c] = nq, f = fa[f];
		}
	}
}

char s[M * 3];
void work()
{
	int mlgb = mask;
	int l = strlen(s);
	for(int i = 0; i < l; i++)
	{
		mlgb = (mlgb * 131 + i) % l;
		swap(s[i], s[mlgb]);
	}
//	puts(s); 
}
	
int main()
{
	int q = read();
	scanf("%s", s + 1);
	int l = strlen(s + 1);
	for(int i = 1; i <= l; i++) insert(s[i] - 'A');
	while(q--)
	{
		scanf("%s", s + 1);
		if(s[1] == 'Q')
		{
			scanf("%s", s);
			l = strlen(s);
			work();
			int now = 1;
			for(int i = 0; i < l; i++) now = ch[now][s[i] - 'A'];
			if(!now) ans = 0;
			else
			{
				T.splay(now);
				ans = T.ver[now];
			}
			cout << ans << "
";
			mask ^= ans; 
		}
		else
		{
			scanf("%s", s);
			l = strlen(s);
			work();
			for(int i = 0; i < l; i++) insert(s[i] - 'A');
		}
	}
	return 0;
}
/*
2
BBABBBBAAB

ADD BBBAAB

QUERY BBA
*/