1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241

#include <bits/stdc++.h>
#define _O0 __attribute__((optimize("O0"))) // 防止沙雕编译器把this当成非空来优化

const int MAXN=3e5+10;

struct Query{
	int type;
	int time;
	int u;
	int v;
	int r;
	bool friend operator<(const Query& a,const Query& b){
		return std::make_pair(a.type,a.time)<std::make_pair(b.type,b.time);
	}
};

struct Dump{
	int t;
	int a;
	int b;
	int c;
};

#define lch chd[0]
#define rch chd[1]
#define kch chd[k]
#define xch chd[k^1]

struct Node{
	int v;
	int sz;
	bool rev;
	Node* prt;
	Node* pprt;
	Node* chd[2];
	Node(int v):v(v),sz(v),rev(false),prt(NULL),pprt(NULL),chd{NULL,NULL}{}
	inline _O0 int size(){
		return this==NULL?0:this->sz;
	}
	inline void Maintain(){
		this->sz=this->lch->size()+this->rch->size()+this->v;
	}
	inline _O0 void Flip(){
		if(this!=NULL){
			std::swap(this->lch,this->rch);
			this->rev=!this->rev;
		}
	}
	inline void PushDown(){
		if(this->rev){
			this->lch->Flip();
			this->rch->Flip();
			this->rev=false;
		}
	}
};
Node* N[MAXN];

void Rotate(Node* root,int k){
	Node* tmp=root->xch;
	root->PushDown();
	tmp->PushDown();
	tmp->prt=root->prt;
	if(root->prt==NULL){
		tmp->pprt=root->pprt;
		root->pprt=NULL;
	}
	else if(root->prt->lch==root)
		root->prt->lch=tmp;
	else
		root->prt->rch=tmp;
	root->xch=tmp->kch;
	if(root->xch!=NULL)
		root->xch->prt=root;
	tmp->kch=root;
	root->prt=tmp;
	root->Maintain();
	tmp->Maintain();
}

void Splay(Node* root){
	while(root->prt!=NULL){
		int k=root->prt->lch==root;
		if(root->prt->prt==NULL)
			Rotate(root->prt,k);
		else{
			int d=root->prt->prt->lch==root->prt;
			Rotate(k==d?root->prt->prt:root->prt,k);
			Rotate(root->prt,d);
		}
	}
}

void Expose(Node* root){
	Splay(root);
	root->PushDown();
	if(root->rch){
		root->rch->pprt=root;
		root->rch->prt=NULL;
		root->rch=NULL;
		root->Maintain();
	}
}

Node* Access(Node* root){
	Node* dump=root;
	Node* tmp=NULL;
	while(root){
		Expose(root);
		root->rch=tmp;
		if(tmp){
			tmp->pprt=NULL;
			tmp->prt=root;
		}
		root->Maintain();
		tmp=root;
		root=root->pprt;
	}
	Splay(dump);
	return tmp;
}

void Evert(Node* root){
	Access(root);
	root->Flip();
}

Node* FindRoot(Node* root){
	Access(root);
	Node* ans=root;
	while(ans->lch)
		ans=ans->lch;
	Splay(ans);
	return ans;
}

int Calc(int a,int b){
	if(FindRoot(N[a])!=FindRoot(N[b]))
		return -1;
	int ans=0;
	Access(N[a]);
	ans+=N[a]->size();
	Node* lca=Access(N[b]);
	ans+=N[b]->size();
//	printf("%d\n",ans);
	Access(lca);
	ans-=2*lca->size();
//	printf("%d %d lca=%p\n",a,b,lca);
	return ans;
}

void Link(int x,int y){
//	printf("link %d <- %d\n",x,y);
	Evert(N[y]);
	N[y]->pprt=N[x];
}

void Cut(int x){
//	printf("cut %d\n",x);
	Evert(N[1]);
	Access(N[x]);
	N[x]->PushDown();
	N[x]->lch->prt=NULL;
	N[x]->lch=NULL;
	N[x]->Maintain();
}

int n;
int q;
int cnt;
int L[MAXN];
int R[MAXN];
Dump D[MAXN];
int ans[MAXN];
int prt[MAXN];
int alive[MAXN];
std::vector<Query> Q[MAXN];

int main(){
	scanf("%d%d",&n,&q);
	cnt=1;
	N[0]=new Node(0);
	N[1]=new Node(1);
	Link(1,0);
	L[1]=1,R[1]=n;
	prt[0]=1;
	prt[1]=-1;
	for(int i=0;i<q;i++){
		scanf("%d%d%d",&D[i].t,&D[i].a,&D[i].b);
		if(D[i].t!=0)
			scanf("%d",&D[i].c);
		else{
			N[++cnt]=new Node(1);
			L[cnt]=D[i].a;
			R[cnt]=D[i].b;
		}
	}
	int last=0;
	int cur=1;
	for(int i=0;i<q;i++){
		if(D[i].t==0){
			prt[++cur]=last;
			Link(last,cur);
		}
		else if(D[i].t==1){
			int l=std::max(L[D[i].c],D[i].a),r=std::min(R[D[i].c],D[i].b);
			if(l>r)
				continue;
			N[++cnt]=new Node(0);
			Link(last,cnt);
			prt[cnt]=last;
			last=cnt;
			Q[l].push_back({1,i,cnt,D[i].c,r+1});
		}
		else
			Q[D[i].a].push_back({2,i,D[i].b,D[i].c,0});
	}
//	for(int i=0;i<=cnt;i++)
//		printf("N[%d]=%p\n",i,N[i]);
	for(int i=1;i<=n;i++){
		std::sort(Q[i].begin(),Q[i].end());
		for(auto q:Q[i]){
			if(q.type==1){
				if(q.r)
					Q[q.r].push_back({1,q.time,q.u,prt[q.u],0});
				Cut(q.u);
				Link(q.v,q.u);
				prt[q.u]=q.v;
			}
			else{
			//	assert(q.type==2);
				ans[q.time]=Calc(q.u,q.v);
			}
		}
	}
	for(int i=0;i<q;i++)
		if(D[i].t==2)
			printf("%d\n",ans[i]);
	return 0;
}