#pragma GCC optimize("Ofast")
#pragma GCC target("avx2")

#define rd_init() char*rp=({char*mmap();mmap(0l,1l<<25,1,2,0,0ll);})
#define rd_skip() while(*rp++>=48)
#define rd() ({int _v=0,_c;while(_c=*rp++-48,_c>=0)_v=_v*10+_c;_v;})
#define rep(v,e) for(typeof(e) v=0;v<e;++v)

#define UFSIZE 200002
int ufbuf[UFSIZE];
void uf_init(){
	for(int i=0;i<UFSIZE;++i){
		ufbuf[i]=-1;
	}
}
int uf_root(int a){
	int b;
	int t=a;
	while(b=ufbuf[t],b>=0) t=b;
	while(b=ufbuf[a],b>=0) ufbuf[a]=t,a=b;
	return t;
}
void uf_unite(int a,int b){
	a=uf_root(a);
	b=uf_root(b);
	if(a!=b){
		if(ufbuf[a]<ufbuf[b]){
			ufbuf[a]+=ufbuf[b];
			ufbuf[b]=a;
		}else{
			ufbuf[b]+=ufbuf[a];
			ufbuf[a]=b;
		}
	}
}

unsigned wbuf[1<<20];

int main(){
	uf_init();
	rd_init();
	int n=rd();
	rd_skip();
	rep(i,n){
		if(*rp=='-'){
			rp+=3;
		}else{
			int p=rd();
			uf_unite(i+1,p);
		}
	}
	unsigned*wp=wbuf;
	while(*rp){
		int a=rd();
		int b=rd();
		if(uf_root(a)==uf_root(b)){
			*wp++='\nseY';
		}else{
			*wp++='\n oN';
		}
	}
	write(1,wbuf,(wp-wbuf)*sizeof*wbuf);
	_exit(0);
}