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3673: 可持久化并查集 by zky

Time Limit: 5 Sec  Memory Limit: 128 MB
Submit: 2724  Solved: 1206
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Description

n个集合 m个操作
操作:
1 a b 合并a,b所在集合
2 k 回到第k次操作之后的状态(查询算作操作)
3 a b 询问a,b是否属于同一集合,是则输出1否则输出0

0<n,m<=2*10^4

 

Input

 

Output

 

Sample Input

5 6
1 1 2
3 1 2
2 0
3 1 2
2 1
3 1 2

Sample Output

1
0
1




HINT

 

Source

出题人大SB

 
没错我就是来骗访问量的,
这道题和上一道题的唯一区别就是
不用xor!
 
#include<iostream>#include<cstdio>#include<cstring>#include<cmath>#include<algorithm>#include<ext/rope>using namespace std;using namespace __gnu_cxx;const int MAXN=2000050;const int maxn=0x7fffffff;void read(int &n){    char c=‘+‘;int x=0;bool flag=0;    while(c<‘0‘||c>‘9‘){c=getchar();if(c==‘-‘)flag=1;}    while(c>=‘0‘&&c<=‘9‘){x=x*10+(c-48);c=getchar();}    flag==1?n=-x:n=x;}rope<int> *rp[MAXN];int a[MAXN];int n,m,how,x,y,lastans;int find(int i,int x){	if(rp[i]->at(x)==x) 	return x;	int f=find(i,rp[i]->at(x));	if(f==rp[i]->at(x))		return f;	rp[i]->replace(x,f);	return f;}void merge(int i,int x,int y){	x=find(i,x),y=find(i,y);	if(x!=y)	rp[i]->replace(y,x);}int main(){    int n,m;    read(n);read(m);    for(int i=1;i<=n;i++)	a[i]=i;	rp[0]=new rope<int> (a,a+n+1);	for(int i=1;i<=m;i++)	{		rp[i]=new rope<int> (*rp[i-1]);		int how;read(how);		if(how==1)		{			read(x);read(y);			merge(i,x^lastans,y^lastans);		}		else if(how==2)		{			read(x);			rp[i]=rp[x^lastans];		}		else if(how==3)		{			read(x);read(y);			printf("%d\n",(find(i,x^lastans)==find(i,y^lastans)));		}	}    return 0;}

  

3673: 可持久化并查集 by zky