记录编号	143892	评测结果	AAAAAAAAAA
题目名称	[SDOI 2008]Cave 洞穴勘测	最终得分	100
用户昵称	cstdio	是否通过	通过
代码语言	C++	运行时间	1.064 s
提交时间	2014-12-18 15:58:37	内存使用	0.42 MiB

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;
const int SIZEN=10010;
class Node{
public:
	int lc,rc,fa;
	bool inv;
	Node(){lc=rc=fa=inv=0;}
	#define lc(x) Tree[x].lc
	#define rc(x) Tree[x].rc
	#define fa(x) Tree[x].fa
	#define inv(x) Tree[x].inv
}Tree[SIZEN];
bool Is_Root(int x){return lc(fa(x))!=x&&rc(fa(x))!=x;}
void Push_Down(int x){
	if(inv(x)){
		swap(lc(x),rc(x));
		inv(lc(x))^=1;
		inv(rc(x))^=1;
		inv(x)=false;
	}
}
void Zig(int x){//右旋
	int y=fa(x),z=fa(y);
	if(lc(z)==y) lc(z)=x;
	if(rc(z)==y) rc(z)=x;
	fa(x)=z;
	lc(y)=rc(x);fa(lc(y))=y;
	rc(x)=y;fa(y)=x;
}
void Zag(int x){//左旋
	int y=fa(x),z=fa(y);
	if(lc(z)==y) lc(z)=x;
	if(rc(z)==y) rc(z)=x;
	fa(x)=z;
	rc(y)=lc(x);fa(rc(y))=y;
	lc(x)=y;fa(y)=x;
}
void Splay(int x){
	Push_Down(x);
	while(!Is_Root(x)){
		int y=fa(x),z=fa(y);
		Push_Down(z);Push_Down(y);Push_Down(x);
		if(Is_Root(y)){
			if(lc(y)==x) Zig(x);
			else Zag(x);
			return;
		}
		if(lc(z)==y){
			if(lc(y)==x) Zig(y),Zig(x);
			else Zag(x),Zig(x);
		}
		else{
			if(rc(y)==x) Zag(y),Zag(x);
			else Zig(x),Zag(x);
		}
	}
}
void Access(int x){
	int y=0;
	while(x){
		Splay(x);
		rc(x)=y;
		y=x;
		x=fa(x);
	}
}
int Get_Root(int x){
	Access(x);
	Splay(x);
	while(lc(x)){
		Push_Down(x);
		x=lc(x);
	}
	Splay(x);
	return x;
}
void Make_Root(int x){
	Access(x);
	Splay(x);
	inv(x)^=1;
}
void Link(int x,int y){
	Make_Root(x);
	fa(x)=y;
	Splay(x);
}
void Cut(int x,int y){
	Make_Root(x);
	Access(y);
	Splay(y);
	fa(lc(y))=0;lc(y)=0;
}
void Query(int x,int y){
	if(Get_Root(x)==Get_Root(y)) printf("Yes\n");
	else printf("No\n");
}
int N,Q;
void Process(void){
	char cmd[10];
	scanf("%d%d",&N,&Q);
	int a,b;
	for(int i=1;i<=Q;i++){
		scanf("%s",cmd);
		scanf("%d%d",&a,&b);
		if(cmd[0]=='C')	Link(a,b);
		else if(cmd[0]=='D') Cut(a,b);
		else if(cmd[0]=='Q') Query(a,b);
	}
}
int main(){
	freopen("sdoi2008_cave.in","r",stdin);
	freopen("sdoi2008_cave.out","w",stdout);
	Process();
	return 0;
}