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| #include<algorithm>
#include<iostream>
#include<iomanip>
#include<cstring>
#include<cstdlib>
#include<climits>
#include<vector>
#include<cstdio>
#include<cmath>
#include<queue>
#include<stack>
using namespace std;
inline const int Get_Int() {
int num=0,bj=1;
char x=getchar();
while(!isdigit(x)) {
if(x=='-')bj=-1;
x=getchar();
}
while(isdigit(x)) {
num=num*10+x-'0';
x=getchar();
}
return num*bj;
}
const int maxn=200005;
struct Tree {
int father,child[2];
bool rev;
int val,sum;
};
struct Link_Cut_Tree {
Tree tree[maxn];
stack<int>S;
#define fa(x) tree[x].father
#define ls(x) tree[x].child[0]
#define rs(x) tree[x].child[1]
#define rev(x) tree[x].rev
bool isroot(int index) {
return ls(fa(index))!=index&&rs(fa(index))!=index;
}
bool checkson(int index) {
return rs(fa(index))==index;
}
void push_down(int index) {
if(!rev(index))return;
swap(ls(index),rs(index));
rev(ls(index))^=1;
rev(rs(index))^=1;
rev(index)=0;
}
void push_up(int index) {
tree[index].sum=tree[ls(index)].sum+tree[rs(index)].sum+tree[index].val;
}
void rotate(int index) {
int father=fa(index),grand=fa(father),side=checkson(index);
if(!isroot(father))tree[grand].child[checkson(father)]=index;
tree[father].child[side]=tree[index].child[side^1];
fa(tree[father].child[side])=father;
fa(father)=index;
tree[index].child[side^1]=father;
fa(index)=grand;
push_up(father);
push_up(index);
}
void splay(int index) {
S.push(index);
for(int i=index; !isroot(i); i=fa(i))S.push(fa(i));
while(!S.empty())push_down(S.top()),S.pop();
for(int father; !isroot(index); rotate(index)) {
father=fa(index);
if(!isroot(father))rotate(checkson(index)==checkson(father)?father:index);
}
}
int access(int index) {
int son=0;
for(; index; son=index,index=fa(index))splay(index),rs(index)=son,push_up(index);
return son;
}
void reverse(int index) {
access(index);
splay(index);
rev(index)^=1;
}
void link(int x,int y) {
reverse(x);
fa(x)=y;
}
void split(int x,int y) {
reverse(x);
access(y);
splay(y);
}
void cut(int x,int y) {
split(x,y);
ls(y)=fa(x)=0;
}
int query(int x,int y) {
reverse(1);
int sum=0;
access(x),splay(x);sum+=tree[x].sum;
int lca=access(y);splay(y);sum+=tree[y].sum;
access(lca),splay(lca),sum-=2*tree[lca].sum;
return sum;
}
} lct;
int n,m,q=0,cnt=0,size=0,ans[maxn],id[maxn],Left[maxn],Right[maxn];
int newnode(int v) {
lct.tree[++cnt].val=v;
return cnt;
}
struct Option {
int opt,x,from,to,id;
Option(int o=0,int x=0,int f=0,int t=0,int id=0):opt(o),x(x),from(f),to(t),id(id) {}
};
vector<Option> Opt[maxn];
int main() {
n=Get_Int();
m=Get_Int();
id[++size]=newnode(1),Left[size]=1,Right[size]=n;
int last=newnode(0);lct.link(last,id[1]);
for(int i=1; i<=m; i++) {
int opt=Get_Int();
if(opt==0) {
id[++size]=newnode(1),Left[size]=Get_Int(),Right[size]=Get_Int();
lct.link(last,id[size]);
} else if(opt==1) {
int l=Get_Int(),r=Get_Int(),x=Get_Int();
l=max(l,Left[x]),r=min(r,Right[x]);
if(l>r)continue;
int now=newnode(0);lct.link(now,last);
Opt[l].push_back(Option(1,now,last,id[x]));
Opt[r+1].push_back(Option(1,now,id[x],last));
last=now;
} else {
int x=Get_Int(),u=Get_Int(),v=Get_Int();
Opt[x].push_back(Option(2,x,id[u],id[v],++q));
}
}
for(int i=1; i<=n; i++)
for(auto now:Opt[i]) {
if(now.opt==1)lct.cut(now.x,now.from),lct.link(now.x,now.to);
else ans[now.id]=lct.query(now.from,now.to);
}
for(int i=1; i<=q; i++)printf("%d\n",ans[i]);
return 0;
}
|
